How To Remove Air From Your Heating System

For more information or a written out step by step you can stop by www.thediyguy.net/2014/10/how-... . A video on how to remove air from your heating system.

[@Marlitonext10]

I must thank you my friend, today we came home and it is literally -0° (Boston MA) and after watching your video, I was able to turn our heater on, thank God for this new technology and your KZbin channel, we have 3 babies that were gonna be very cold, but thank you again God Bless you!!!

[@howboutno9993]

Your video just saved me money. I was reading forums and got nowhere. You gave me the info I needed to get my house warm again. Thanks!!

[@jimmyurban]

I have to add my many thanks too. My system was a bit more complicated with six zones, different makes and configuration, but with your clear and thorough explanations I was able to translate to my system and solve my air problem after installing a new circulation pump. Much appreciated!

[@ryanclarke83]

I watch this video every year (at least 3 years in a row now) when I bleed my system to remind myself how to do it correctly. Thanks!

[@Patiencelad]

Thanks again for sharing this great tutorial. I just used it bleed out my mom's heating system. Saved us time and money and now we can do it ourselves going forward. God bless you!

[@enriquealberto37]

I did a Google search, your video was the first to show. I can see why, the perfect-to the point DIY. I will watch your entire library, a great teacher you are, thank you!

[@songsfromthelord888]

Thanks DIY Guy! It helps to know what one is doing, doesn't it? Remember DIY, that God loves you and He did it Himself, and not according to our plans or according to our instructions 🙂

[@gened2537]

I have looked at about 20 videos and they are so scattered. You made this so simple. Thank you for showing this task in a simple way and not over engineering it. Appreciated!

[@TheDIYGuyDOTnet]

Glad you found are video helpful. You're welcome. Thanks for watching and taking the time to leave us a comment.

[@tsveno72]

Can you open the valve that adds water when purging the 1st floor too?

[@stfuplsok]

@@TheDIYGuyDOTnet *our

[@billpholde4816]

Best video on this subject, that I've seen. Nice steady shot of the system instead of the life-during-an-earthquake vids others have posted.

[@mattfoley6082]

Thanks for this. I wasn't doing it right. I could not get the air out of my upstairs zone because I closed the downstairs valve but left the upstairs valve open (yellow handles). Some of the air came out the hose but some of it continued past the hose and back around into the zone again. After 30 minutes of failure I gave up and looked online and found your video. The key point you taught me is to close ALL the valves including on the zone you're bleeding, which forces all the water and air out the hose.

[@huilin5841]

you should also leave the lever up on the feeder valve while bleeding to make up the pressure lost.

[@mattfoley6082]

@@huilin5841 True but if you do that then you also need to watch your pressure gauge! Must keep it below 30psi or the pressure relief valve will dump water all over the floor.

[@1TruePatriot]

Excellent video! Clear, concise, plain, simple and to the point. Upvoted and subscribed!

[@crooktube]

THANK YOU! I've done a lot of work on this boiler to keep it running and some cold nights. Just replaced the taco pump and the temp gauge, total of $200 and I'm hoping it saved me from a brand new boiler for at least one more year! Just got quoted on a new boiler, $20K!!! There was a ton of water in my system after doing this work and it was so cool to hear the air coming out and then finally running clean and with no air I hope! I'm not sure what happens when there is air in the system.... but I'm glad I did it. Woke up in a warm house.

[@GreenEarth140]

Your video is PERFECT !!! Simple to follow , straight to the point. Well done !!!!

[@khmerboy044]

Thank you!!! This video help me fixed my heat. I had an appointment for a Plummer to come but I had canceled it after following the steps from this video.

[@helkittyegg]

Thanks for your video, makes it simple and easy to watch and understand the process. I will definitely go back to watch again when i try to do it next time.

[@DanielRamirez-iq3rt]

Just wanted to say it's awesome the content creator is taking the time to answer everyone's questions. Great video by the way.

[@TheDIYGuyDOTnet]

We do try and answer all the comments or questions we get. The idea behind the channel is to help people so if we can do that by answering someones question to help clarify something for them. Thank you for taking the time to watch our video and leave us a comment. Don't forget to give the video a thumbs up. Thanks

[@jessellis5466]

Awesome tutorial. Just bought a house with this type of system and I have never had this type. Very helpful now I know how to get rid of the noises!

[@BrianFesta]

Clutch video. I had been putting this off for years! A 20 dollar hose got me my sleep back! Thanks so much

[@towniepats4409]

Wow clear simple explanation. The best video on KZbin! Thank You for this.

[@misterfish804]

Thank you for your video. Your explanation is clear, to the point and without the unnecessary banter that are found in other videos. I followed your instructions and 5 minutes later my pipes are quiet once again. Money saved on plumbers can go towards pizza night.

[@zimpler8340]

Absolutely! No bullshit! Straight to the point!!!!!

[@keepingitpinnedlongasican2513]

I'm watching this as I hear the waterfall noise that is my floor heaters. Yea this is happening this week lol

[@superskunkygrow]

Mine are doing the same thing it’s sooooo damn loud. This is my first house with hydronic heat since I was like 6 years old (obv wasn’t the one doing it back then) I remember watching my dad bleed our radiators but the place I’m at now doesn’t have bleeders on the registers smfh. Im going to get a water hose today and doing this.

[@keepingitpinnedlongasican2513]

What a coincidence we have the same name and our first house lol. I'm lucky I got bleeders at each section.

[@vickierhodes5504]

Ppp

[@vickierhodes5504]

Pqa

[@josiee_deeee]

Thank you for your video! You explained step by step clearly and now I have heat!!!! Thank you and God bless!!!

[@stonearches2883]

Great video. Straight to the point, simple. Thank you!

[@TheDIYGuyDOTnet]

You're welcome, Glad we could help and you found our video helpful. Thanks for watching and taking the time to leave us a comment.

[@dubmob151]

This was invaluable info in purging the air from the system after I had to open it up to fix a leak in a PEX clamp connection that must have been poorly installed. Clamp just split completely and it ruined the flooring and ceiling below from the slow leak that resulted. Followed the sequence of closing the ball valve, connecting the drain hose to the gate valve, opening the gate valve and letting the air get mostly pushed out. For some reason the second story zone still apparently has some air in it because it can be heard as the circulation is going on but at least it's now delivering heat, where it was completely cold before. Tried the rapid fill to increase the pressure but that resulted in the pressure release popping, so I could only do that very sparingly, to avoid flooding the floor when it released. I may try another purge session after it runs a while under pressure.

[@iriscolon2780]

Omg! Thank you for this video! My system is basically the same except for the zone valve. My is a Honeywell V8043E Zone valve.

[@wkbsgreenville888]

Thank you so much. Worked great. Air wasn’t apparently causing pressure in furnace to be higher than it should be

[@camgreer]

Great. Nice straightforward explanation. Just the ticket.

[@mtfulemming]

This is the most concise video I have found for this process. Thank you

[@TheDIYGuyDOTnet]

AYou're welcome. glad we could help. Thanks for watching and taking the time to leave us a comment. Don't forget to give it a thumbs up if you haven't already so it makes it easier for other people to find.

[@fit_tofat3152]

Thank you for this. I’ve been looking for a video tutorial and you’ve explained it to the T. No need to hire someone to do it.

[@mannydecastro9533]

Great demostration step by step the best.great job

[@cubby619]

Great video. I had a heating service come by to do this with an annual cleaning but the air bubbles come back in the line within 3-4 months. NE living still need the heat through May.

[@SimonSeagrave]

Great video, thank you! I tried it and it worked perfectly. The only thing I did differently is run the hose into a large bucket, so I could see the air bubbles bubble-up through the water - when this stopped for a while I knew any air was purged. Thanks again.

[@TheDIYGuyDOTnet]

You're welcome, Glad we could help. Thanks for watching and taking time to leave us a comment. Another person said that in a comment as well. Good idea. Don't forget to give the video a thumbs up/ like if you haven't already. Thanks

[@zjoesmoe2670]

Thank you so much ive been trying to get air out with no luck didn't know about the zone valve switch . Great video

[@henrychan2043]

Thanks for the great video. It was very informative and allowed me to safely bleed the air from my heating system.

[@senthilramachandran4328]

you are the best man!!!...didnt listen properly first my bad. I screwed it....then listened properly and it is a piece of cake!!

[@oscarvazquez7278]

Thank you for the video. It was very helpful 👍🏽

[@starbaby1968]

You rock!!!!!!!!!!!!!!!!!! I was missing a step when bleeding our system. I now know how to do it better. Thank you!

[@orlandob9958]

I have subscribed!!! You sir have saved me from the plumbers greedy hands.

[@lcvt8023]

thank you so much for the keeping it simple and to the point! Well done!

[@TheDIYGuyDOTnet]

You're welcome. Glad you found our video straight forward and helpful. Thanks for watching and taking the time to leave us a comment.

[@johnwineburg8296]

Thanks, DIY Guy! Worked like a dream and probably saved me at least 200 bucks!

[@TheDIYGuyDOTnet]

Glad to hear that it worked for you and that we could help save you some money. Thanks for watching and taking the time to leave us a comment.

[@johnwineburg8296]

@@TheDIYGuyDOTnet got any videos on how to r&r a dripping relief valve?

[@294kingshwy]

Used your instructions for a Second year in a row, great work

[@MrKijana23]

Thank you so much for this! It's been driving me crazy thinking I'll need a plumber and now that I've done it and seen how easy that was I'd cry if I'd have shelled $150 for that.

[@TheDIYGuyDOTnet]

You're welcome, Glad we could help save you some money and give you the confidence to take this take on. Thanks for taking the time to leave us a comment and for watching and don't forget to share and thumbs up the video.

[@SiteReader]

Great video. Clear, step-by-step instructions. I looked though a half dozen others before I found yours.

[@TheDIYGuyDOTnet]

+Larry Hecht Well glad to hear you found our video. Thanks for taking the time to leave us a comment and for watching.

[@mima4392]

First, thank you so much for this informative video. I'm a disabled senior widow, on a fixed income. I found this video after I opened the valves that water come out of. That's all I did, but I used a kitchen mop buck, and up and down the stair. It worked and now I have heat. I thought that honeywell thermostat wasn't working. I hate that thing to. I have heat now. Of course this was on the coldest day so far this yr. 20 degrees. Plus a Sunday. That bill would have been at least $350 here in NY. I have a question. How does air get in the pipes in a closed system. I've never had to do this until 2yrs. ago. Again thank you and looking forward to your answer.

[@titodieselcasadiego316]

Thank you for sharing your videos!!

[@Pennconst101]

Quick tip for you, if you get a garden hose just long enough to put into a 5 gallon bucket it works a little bit better in that you were able to see inside the bucket when all the air bubbles are out.

[@ohghodnotanothername]

nice work. I have a 9-zone system + sidearm water heater. 2 loops dead (driveway, long ago, garage froze and ruptured loop more recently, cutoffs and zone-valves hold water). 7 to bleed air from. 2 floors, water dist manifolds on ceiling of boiler room (driven by 2nd pump, on 2nd loop), downstairs loops do a lot of up/down from furnace to manifolds, to loops. Lots of air-trap potential. which floor should I purge 1st ? bottom ?? does banging tend to happen when the loop with air is being heated, and not otherwize ? If so, I could start to check whats hot when I hear banging, and purge that loop 1st. furnace primary loop has 2 drain valves with cutoff between, this looks like the spot. water fill is downstream of the cutoff, I presume drain valve is upstream of cutoff ? should I wait til spring ?

[@shenyiheng]

Thanks a lot for the DIY video. It makes a lot of sense. I had my boiling firing on but the water is not circulating. Initially I thought the pump is broken. Then I leaked some water from the pressure valve and also added more water pressure from the refill valve. The pump seems working again now. But I guess I should do it properly to remove move air now after watching your video. Just one question. My returning water not only goes back to boiler for reheating but it also connects directly to the hot water sending side (without reheating). There is a valve between that link however that valve is turned on right now. This is very strange to me. Why the returning water not just go back to boiler? And now I am not sure how I can drain the water to remove air. I guess I must shut off the valve so that the returning water does not go back to hot water side. Thanks!

[@larrycampbell1104]

Great Video, thanks!!!

[@rubenenergypoprider2048]

Awesome video, and steady camera, love it

[@TheDIYGuyDOTnet]

Glad you found our video. Thanks for watching and taking the time to leave us a comment. Don't forget to give it a thumbs up if you haven't already so it makes it easier for other people to find.

[@awacs1e3]

thank you so much for the video, helped out Tremendously

[@earthling2007]

And saved you hundreds of $$$$ most likely

[@aarontorres4487]

Thank You for your video something so simple to resolve!! Money saver for sure!

[@jivepatrol6833]

Excellent thanks. Just one small comment - I would let the boiler cool down completely because I wouldn't want cold water rushing through a hot heat exchanger. An onrush of cold water may create a thermal shock and crack the heat exchanger. Thank You.

[@rickywinthrop]

This will never happen as the volume of water already in the system will act as a cushion against rapid temp change. In a teeny tiny system maybe it could be problematic but in a large one its no biggie. I work highrise building and haven't cracked a heat exchange in 15 years at that scale.

[@JohnSmith-cp2yg]

Hey Rick I did this a couple times and I still got water hammer what do you think ​@@rickywinthrop

[@lazmotron]

In the winter Would you let the water temperature cool down till the thermostat on the hydronic boiler went down to about 70F, which is the bottom of the scale?

[@romeog8250]

Great explanation. Thank you!

[@TheDIYGuyDOTnet]

You're welcome, Glad we could help and thanks for watching and taking the time to leave us a comment.

[@USMC_BABE38]

Thank you this video is so helpful

[@williamstandley1450]

Thank you,it worked

[@johnpike2778]

Great video so helpful

[@empiremack]

Very simple no idle chatter video. Excellent job.

[@TheDIYGuyDOTnet]

Thanks for watching and taking the time to leave us a comment.

[@kopballe3r]

Great tutorial. Thank you for sharing.

[@TheDIYGuyDOTnet]

+Ivan Torres You're welcome, Thanks for watching.

[@sohanahmad9979]

Hi, this is a great video. But I have one question. My new Yorker boiler is tankless. Should I still turn the oil switch off in that case? How would the water from the line heat up otherwise?

[@machineaddictivedigging4156]

Simple set up nice work 👍

[@TheDIYGuyDOTnet]

Thanks for watching and taking the time to leave us a comment.

[@sosantana8249]

Liked and subbed! Nuff said! 🤝👍🏽

[@Talentman18]

Thank you it worked!!!

[@Chris-pj1os]

Thanks for posting! Would you be able to tell me how I can check the water level on a slant/fin S90 boiler?

[@davidbrady3177]

Thank you!!

[@mikeatv]

excellent video....worked gr8 for us....thanks.

[@TheDIYGuyDOTnet]

+mikeatc33 Great glad to hear we could help. Thanks for watching and taking the time to leave us a comment.

[@elonpuff8]

+TheDIYGuyDOTnet my heat work downstairs but not upstairs it's a oil furnace plz help it's 2 degrees in my city

[@flyleclair]

This is a fantastic video but what happens if you don't have a shut off valve by the drain valve? Is there a check valve in the circulator pump to prevent water from flowing from the boiler?

[@johnal4560]

nice video is that gonna get all the dirt from the system as will or there is another way to do that thx

[@roxiebkdime5224]

THANK YOU =) . This video was a life saver

[@TheDIYGuyDOTnet]

You're welcome, Glad we could help. Thanks for watching.

[@Jayhtv6]

Outstanding much appreciated

[@TheDIYGuyDOTnet]

Glad we could help. Thanks for watching and taking the time to leave us a comment.

[@gregdavidson5898]

Question: As I recall when I did this a few years ago, the pressure dropped too much to push a healthy stream of water out the hose and I had to pull the lever up on the Feeder Valve to get the pressure back up. (Yeah, one year I left the room and heard a loud noise as there was TOO much pressure and the overflow pipe blew water over the floor - though I must say the system was really toasty that year). Since then, 2 out of my 3 zones had small little "air bleeders" installed. I think they are supposed to automatically bleed the air out of those zones. Do I periodically open those bleeders to get air out? Also, there is an Isolation Valve to the overhead Expansion Tank. One repair guy bleeds with it open, another guy said you had to close it when bleeding, etc. So, I am stumped on that. TIA

[@khmerboy044]

I’m having this same problem. How did you resolve the water from overflowing??

[@michelleclerc2899]

Great video!!!

[@GP9railfan]

Don’t forget to verify the pressure and set to 18 psi using the purge valves that the garden hose was on, then unhook hose and turn the boiler back on. The feeder valve will over pressurize the system to water pump setting, or town/city pressure, 35-65 psi depending on the source, so it’s important to verify after purging any air.

[@justinmcdermott4690]

So I didn’t see your comment until I had already unhooked the hose. Now the pressure is way to high. How do I lower it? Thanks for your help.

[@lowellabraham6966]

@@justinmcdermott4690 were you able to figure it out?

[@peterbalogh5622]

I see you didn’t adjust your folk pressure valve at all. Other people have done so but I’m scared of damaging/flooding my system. What are your thoughts?

[@slipperyphish]

Very helpful, tyvm

[@TheDIYGuyDOTnet]

You're welcome, Glad we could help. Thanks for watching and taking the time to leave us a comment. Don't forget to give the video a thumbs up. Thanks

[@randypowell4799]

Thanks for the video. Question for you, are those hose bibs at the return to the boiler?

[@TheDIYGuyDOTnet]

You're welcome. The piece where you could attach the hose would be called Boiler Drain or Boiler Drain Valve. To be really specific for these in the video 1/2" MPT Boiler Drain, Male Threaded. Thanks for watching and taking the time to leave us a comment/ question. Don't forget to give the video a thumbs up/ like if you haven't already. Thanks

[@Axis.Mundis.]

I have a similar setup with the boiler. I have tankless hot water tho. I want to tie a wood stove so I can heat with oil and wood. I believe I have steam heat, cast iron radiators. I want to connect the wood stove chimney to the oil burner with a T so i dont need a separate chimmney setup. having a electronic flap for the oil burner can I even do this? Does it go before or after the flap? I'm sick of being cold and always running out of oil

[@standepain]

I don't have any shut off valves for my loops like you do here. I do have Taco zone valves right after the drain valves on my loops so I'm guessing they will act as the as a shut off valve if they're in the closed position?

[@Guitarboy59]

Hi. Enjoyed your video. Is the zone valve like a circulator?

[@TheDIYGuyDOTnet]

A zone valve is just that, A valve that opens when the t-stat calls for heat to allow the hot water to flow though the zone. ( t-stat also turn on the circ pump as it opens the valve) The circ pump is whats used to push the water though the zone. Most older houses had a circulator pump for each zone. Most newer houses have zone valves on each zone and one circ pump. The reason for this is to save energy by having one pump and zone valves and also to save space being that a zone valve is smaller then pumps.

[@papadave3084]

@TheDIYGuyDOTnet In this video, on your system the direction of the flow of boiler water goes from the boiler, to the zone valves, to the "spigot valves", to the "line shut-off valves". (I'm not sure what they are actually called). On my boiler system, the flow of water goes from the boiler to the zone valves, to the line shut-off valves, and then to the spigot valves. Does it matter that my spigot valves are "down-line" from my line shut-off valves? In my case it seems that I would have to keep the line shut-off valve in the open position in order for the water to circulate through the entire zone, and then out the water hose. (I have 3 zones, so I would need to close the line shut-off valves of the 2 zones from which I am not trying to purge the air).

[@us-unclesam6566]

I have auto vents on all my baseboard radiators, I simply turn the supply water on let system fill to about 13 psi. Let it set for air to rise and then open each floor vent starting at firs floor. Snug auto vents, bring pressure to 13 psi and then turn heater on and the system circulates any air pockets out the the auto vents. Viola, system air free.

[@leonidsemenov7726]

thanks for the info

[@TheDIYGuyDOTnet]

You're welcome, Glad we could help. Thanks for watching and taking the time to leave us a comment.

[@blcksteam]

thanks that video helped me out

[@TheDIYGuyDOTnet]

You're welcome, Glad we could help. Thanks for watching and taking the time to leave us a comment. Don't forget to give the video a thumbs up/ like if you haven't already. Thanks

[@mts2457]

What if im in an apartment building and have a separate thing of valves in my closet of my apt. , are those to be able to get air out? I've been having rushing/trickling water sound often. It goes through 3 baseboard heaters

[@chrisvarzaly]

Thanks! This helped so much!

[@rxlo1062]

Awesome job

[@TheDIYGuyDOTnet]

Thanks. Thank you for watching and taking the time to leave us a comment.

[@user-BE-MORE-WADE]

Thank you sir you have a sub 👍

[@fqeng79]

Very informative. Question- I need to purge one out of three zones only. For that single zone, do I need to shut all return valves or just the one that I need purged and leave the other 2 in normal open position? Thanks

[@TheDIYGuyDOTnet]

You could get away with not shutting the other ones. But I find it best to shut all just to be sure that all the water pressure goes though the zone your trying to purge. In case that shutoff valve leaks.

[@1rcproductions]

These are closed systems, correct? If you drain water out to bleed do you have to add new water into the pipes after getting rid of any air in the line? Thanks.

[@squirrelattackspidy]

Would this help if you're not getting much heat on the 2nd floor? Could it be air in the line? Had this done a couple years ago and it seemed to fix it. But I also had that water regular thing break and water was all over the place. Then the plumbing guy came out and replaced the regular and bled all the zones. It was banging for a bit and then stopped. Maybe it stopped because there's more air in the line now than water? Thank you for the very organized video. Best one I've seen yet.

[@dogsarefun2]

check if your circulator pump is working....

[@MK-gk1ke]

0:42 Is it a good idea to install "Garden Hose Fitting Quick Connectors"? It will be very easy to connect and take off the garden hose, but the tip of the quick connectors is narrower. I am worried that the narrower tip makes it hard to air purging.

[@NathanThePrezPretlow]

I've got a two-family house I bleed all convectors bottom and second floor but it seems that on the second floor I can't keep the kitchen and liver room convector hot.I check the shut-off valves they are ok.I bleed both convectors until they got hot. Then my tenants call me the next day saying they gotten cold again. What's the problem?

[@oldsilverdrew2471]

In order to get enough pressure to force out the air in the line don't you have to also open the auto feed valve fully?

[@ThomasJoseph315]

Thank you for posting this. I think have that exact boiler too, or close to it with 2 zones. How often should this be done? Everytime the heater turns on I can hear it creaking a little, so this is why I suspect air.

[@papadave3084]

@Thomas Joseph , I am no plumber, but I do have baseboard heat. The "creaking" you hear (like I do) could very well be just from the pipe going from a cool state to a hot state as the heated water reaches and circulates through that particular zone. The metal pipes and the metal "fins" that surround the pipe expand and contract just enough to cause that creaking sound. Now, if you hear gurgling, or something that sounds like a mini waterfall coming from inside your pipes, that means there is air in that particular zone and has to be bled out. Air in these pipes slows down the flow of water through them. That's why it is difficult to heat the rooms properly. Once the air is bled out and there is nothing but water in the pipe, then the rooms will warm up faster, once the boiler temperature is back to normal.

[@olderrol1968]

Thank you 👍🇯🇲

[@rigobertorodriguez9009]

I like the way you explained. Here's my question. Laars boiler. How do I fire up furnace when my my attic thermostat (120v) calls for heat. Only opens zone valve ( 120v) and kicks on secondary pump. But no fire in boiler. Primary thermostat is in 1st floor ( batteries operated) just 2 wires direct to boiler. Note. 2 zone valves are 120v. Not 24 volts. Each zone valve has its own pump to run. 1st floor and attic. But... attic thermostat is also 120 v. Cast iron radiators. The zone valves are in 2" pipes. So I don't want to mess with those. If you Just can help me how wire so the boiler kicks on when attic 120v thermostat calls for heat. Not messing the 1st floor thermostat. If is not calling. Thanks. I hope you can help. Most the guys ( companies around. ) " i never saw those zone valves before " Again. I don't need to do anything to zone valves. I just need fire up the boiler for the attic.

[@EasyToDIY]

excellent

[@thomasbroking7943]

Once you get to the point where you have to raise the pressure to flush everything through it gets tricky. I love to put everything through like 26 lb of a little mistake and you hit 30lbs and there's a mess to clean up. I trained so many helpers and so many had a towel in my truck..

[@dennisvera1125]

This was very helpful! thank you

[@edt9666]

So the feeder valve is always able to provide some pressure to the system so you don't isolate it (close the valve) after you purge the air? If that's the case, so that I'm understanding this correctly, it seems that It wouldn't introduce cold water into the system in any real volume unless there is a break in the loop/valve open/or helping air purge ever so slightly via a bleeder valve.

[@simonganesh3460]

Can you please help. I recently hooked up a boiler that has two zones (one zone for the first floor and the other zone for the second floor). When I started up the boiler and turned on the thermostat on the first floor, the boiler did not start. When I started the thermostat on the second floor, the boiler did start. Any idea why the first floor thermostat didn't trigger the boiler. We wired the thermostat wires to the aquastat (red wire goes to T terminal and white wire goes to TV terminal) Please let me know if I'm missing anything. TIA