gas fired boiler bad main operating control Honeywell L8148E

Honeywell L8148E 1265 Aquastat relay replaced on gas boiler .explain wiring were things go and what for

[@greendryerlint]

That's a great dog. I have an old Slant/Fin boiler with a similar Honeywell control and right after I bought my house, intermittently the pump would run, but it wouldn't fire. I took out the circuit board and resoldered everything on it. Turns out it was some cold solder joints on the board. Also cleaned the contacts on the big relay. It's been over 10 years and no more problems with the board.

[@SerenoOunce]

Very common on these to have cracked solder joints. Last one I worked on had *FIVE* joints that needed reflowing. If handy with a soldering iron a DIY fix can save hundreds on the part alone. These controls might take ~$25 to manf, the markup is plain criminal. Even if the transformer or relay themselves do fail, just wire up some off-the-shelf replacements in an adjacent box and you got a cheap, permanent fix.

[@FlyDL]

Thanks Steve! Great video to help me change out my aquastat. Heat and hot water is a beautiful thing!

[@robf652]

I truly appreciate your work Steve. Everytime I get in a jam with troubleshooting, particularly boilers, I always figure out what I'm doing wrong or what I didn't check just by watching you. Thanks Steve 👌

[@williamrodriguez1490]

Greart help specially for home owners thanks Bill Rodriguez

[@themayorofairconditioning2868]

Steve I'm getting better at this stuff year by year, really want to thank you for posting all these videos. I don't have anyone to ask for advice anymore when I have something I don't know how to do. The answers are always in your videos.

[@do5e]

I have similar problem with a bad controller relay in L8148J. I ordered a replacement Aquastat and I'll be installing it in a few days. Thanks for making this video, I appreciate it.

[@phillipgroom9187]

Great video, good that you were available to help that elderly lady out. Thanks for the video!

[@stevenlavimoniere]

+Phillip Groom she has been a good customer over the years .

[@hllywd964]

You have a plumbing supply store in your truck, its awesome! Nice video Steve!

[@stevenlavimoniere]

+hllywd964 i do carry a lot of stuff in the truck

[@arniegrote319]

Nice when you can find the problem right a way, And nice to have the part on hand, Nice Job Steve.

[@stevenlavimoniere]

+Arnie Grote always not to get her fixed quickly

[@woodbine66]

That's quite a common way to branch off from main flow and return from a manifold in The UK. Except there would usually be either 8 or 10mm (5/16" or 3/8") microbore pipe from flow manifold for each radiator, and same back from each rad to the return manifold. We don't use base board, always rads. Can get blocked though in those small pipes, often at the manifold if system isn't nice and clean with good concentration of corrosion inhibitor mixed in with the water. Thanks again for another great vid.

[@stevenlavimoniere]

+woodbine66 been working for years i did replace the boiler years ago so far no blockage on manifolds . very rear to see piping like this in the states .small tubing like that with taped manifolds .seems to work ok . must of been a guy from the uk that installed it back in the day ,

[@jeffcarpino5843]

Thanks Steve, I was able to change out one easily thanks to your video!

[@milliediquattro9084]

Thanks Steve. I have a sick husband so I do much of the repairs myself. Ill get someone to do this but I believe this is the issue based on the same symptoms you posted. Will let you know.

[@carlosraxon8559]

awesome job Steve Lavimoneare thanks for sharing

[@stevenlavimoniere]

+Carlos Raxon thanks man

[@Brad1237202]

Great repair Steven. Man that snow melted fast! Today you could take the lawnmower out with the temperatures.

[@stevenlavimoniere]

+Brad1237202 i am all set with snow

[@MiHeatingGuy]

The Honeywell aquastat control is a real pain to work on. no room to get your hands it there to work. I don't use the heat past either. good video

[@stevenlavimoniere]

+Mi Heating Guy thanks for the comment

[@Fireship1]

I have never been able to remove the thermocouple when the silver heat transfer compound is used. It just gets baked in there! The job gets harder then when you have to install a new immersion well. At least you didn't have that issue to deal with Steve! Good job man!

[@stevenlavimoniere]

+Fireship1 good point i have had to do that replace the well before because of the paste welding it in there .glad you brought that up.good comment

[@OGjinnjuice]

hello fireship1 I just replaced my aquastat and as you said heat transfer compound was welded onto well. I drained all water from boiler installed new aquastat and now have water gushing from well. What am I doing wrong? How do you replace immersion well?

[@theimaginator16]

It's great when the problem jumps right out at you. Yet again, the Ice Cream Truck had the part to save the day!

[@stevenlavimoniere]

+Ryan Losinger yes i like to have a well stocked truck

[@danielsteele7544]

Love the way you love baby ,I know she is the best kinda company a man can have.Thanks for the great video,Dan in Lake station indiana,named my little cat baby,out of respect for you.

[@ypcharly]

I truly appreciate you doing this and I find it very educational

[@waterheaterservices]

Thanks for the smile on my face Steve, you and Baby the Dog are Next Level HVAC techs.

[@stevenlavimoniere]

thanks for watching

[@mrpanos923]

Hi Steve. Good video. I noticed when you installed the boiler that it's on blocks. That's good because a lot of guys just put them on the floor.

[@stevenlavimoniere]

+Peter V i always like to lift up the boiler on blocks if i can its just a better job

[@robertmatchett2087]

Great job Steve! You make it all look easy.

[@stevenlavimoniere]

+Robert Matchett i try to after 32 years it should be easy

[@michaelhaskoor2538]

My Utica boiler is 50 years old and the AQUASTAT went bad

[@ManuelHernandez-fv2zf]

The manufacturer's engineers perhaps go a little too overboard minimalizing the various components to save costs. So any way, the kind elderly lady had an older home yet a well built home. You earned another big thumbs up, Steve! My gosh, Baby sure has gained quite a large winter wardrobe to wear to show off her skills as a HVAC Technician.

[@stevenlavimoniere]

+Manuel Hernandez i am thinking of looking for some more coats for the dog lol

[@mcroley591]

Nice job Steve. I'm glad that you could get that sweet lady some heat. That should have been a warrant call since the relay failed because you didn't use that heat transfer paste. Lol. Take care.

[@stevenlavimoniere]

+M Croley all in a days work

[@romtopinstal7870]

Congratulations, well-stocked truck

[@stevenlavimoniere]

+RomTop Instal i try to keep my truck well stocked

[@Mike_Muffler]

Hi Steve. Thank You for the video post. I'm gonna go search for an replacement for this old version of the same aqaustat setup but just in case do you know of one to replace with a modern control?... because the board is bad on this one.

[@Progrocker70]

I have exact same boiler, also 15 years old, been great never had a problem with it.

[@stevenlavimoniere]

+Progrocker70 peerless is a good boiler

[@gositolon9474]

Thanks Steve you help a lot keep the good work 👍

[@mytyhwh]

nice, i just diagnosed one bad ,first few days out on my own. I subscribed to your channel. thanks for posting , really good vid and like the dog to.

[@KGBterminator333333]

Great video this helped me a lot

[@bobparrott8130]

next level moma, super tech Steve's working again !!😃

[@stevenlavimoniere]

+Bob Parrott lol all i need is a cape super tech lol

[@ArthriticThumb]

Steve I have no power at the pump or the leads on the circuit board. Does it take time to call for power or should there be power when thermostat is turned up?

[@jonhexom8310]

Nice job Steve. Baby the dog has quite a wardrobe now, haha.

[@stevenlavimoniere]

+Jon Hexom she is a queen lol

[@chenchris7576]

good work stave and cute little dog, thank you

[@stevenlavimoniere]

+chen chris thanks man

[@bradford216]

Got the nice old lady back up and running. Baby has a whole new wardrobe.

[@stevenlavimoniere]

+Gary B baby the dog is styling

[@harrydickson4575]

Great work Steve !!!

[@stevenlavimoniere]

+Harry Dickson steve is working again

[@markbarboza1407]

Anybody here in 2022? Thanks Steve, getting ready to do my boila in Tiverton! Great video!

[@ypcharly]

Hi Steve, I like your video a lot on boiler problems

[@roundhere2368]

I'm looking for a Honeywell L8148E-1216, and I was wondering where I can purchase one, also, please advise if there is a replacement model for it? We tried two different models, one ist 1265 as I remember, but could not get it to work. Thanks in advantage.

[@josephvargas9707]

Do you have a video on how u connect to the roll out in series with lwc

[@jesusomarsales8325]

Thanks Steve great video .. this relay comes with the manufacturer setting yo 180° .. what would be a good reason to raise it to 200° depending on the distance ?

[@whommee]

informative video. thanks for posting

[@stevenlavimoniere]

+nate i try to mix it up with stuff

[@gotredeemed]

Thanks Steve. I replaced a controller after a surge L7224u. The oil burner comes up to temp, but does not circulate. The code says that the circulator (CIR) is OFF. The book says I should be able to toggle it on, but it won't change. Bad board?

[@URBANAMERICANTAC]

I do this work all day then I come home and watch videos of it being done. I think I have a mental issue.

[@gyver471]

APARTMENT .223 me too it’s insane

[@stephenacman3244]

Me 2!!!

[@williedelgado1082]

You and I both!!! Lmao

[@waynehammond4881]

Or we just love what we do

[@mike617]

Same brother! Nothing wrong with keeping our skills up and maybe learning a few different tricks from someone else!!

[@markallen8132]

Nice dog👍. Good video very helpful. Thanks.

[@h13education58]

Hello, thanks for your video. I want to replace mine too, but I don't know which option I should buy for my replacement. On the label, it says Aquastat Relay Type L8148E without the last 4 number just like yours at 3:02 in the video. I wonder how I can check if L8148E 1265 is compatible with my system. Thank you.

[@HVACUncensored]

Good stuff Steve!!

[@stevenlavimoniere]

+Gil Cavey Jr thanks for watching

[@duramax0103]

i have three heating zones, therefore three thermostats. One thermostat keeps starting up the boiler every 15 mins. What can be the problem bad relay?

[@flippowill]

Damn good video. Thanks for posting.

[@randymathews3348]

Is that a Mi series with the Smartvalve? Gotta call earlier. The damper wasn't sending 24 to the saftey switches, I jumped straight from Z to the rollout. HSI lit and vavle opened. But the circ pump relay is shot and it does not listen to the tsat or high limit. Any ideas for a cheaper replacement?

[@stevenlavimoniere]

+Randy Mathews i would go back with oem parts do not try to redesign stuff you can get in but trouble doing that .thats my opinion on trying to save money you can get sued if something goes wrong . me for one am not going down that road

[@greekmaster1001]

Can you wire an Aquastat with a high limit on this L8148e?

[@georgesiatos9848]

great job steven!!

[@stevenlavimoniere]

+George Siatos thanks man

[@OGjinnjuice]

hello love your videos. I have a question regarding after replacing aquastat. From Thermal well its gushing water. What am I doing wrong?

[@compactc9]

A good friend of mine had this control pull a “Buzzy Ginsburg” last night and they lost heat!! 😮

[@williamwallison6743]

How do you install a low water cut off to the burner

[@sage51810]

Great work, you have some inventory

[@stevenlavimoniere]

+Vinny Trocino i try to keep my truck stocked it the brim

[@RRada-kx8ip]

Nice Job Steve! Talk about 10 pounds of wiring in a 5 pound box... sure was crowded in that Honeywell controller...

[@stevenlavimoniere]

+Rich Rada very busy control for sure

[@shannonmoloughney3336]

Hi Steve. I have a similar aqua stat (L8148J). I want to install a new smart thermostat that requires a C wire. I've read that the Z terminal on the aqua stat may be able to provide the required 24V. Any ideas? Thanks!

[@tomkristman1456]

Call the customer support. They normally recommend a separate transformer as to not overload the unit.

[@mikemalone6103]

You were right, first thing I noted is the probe was dry, yours was too, heat conduction paste makes the control react to changes in temperature faster, if a small part of the sensor is touching the well, it will adventually work, but if the boiler runs away, your held liable for all damages. Honeywell even included the stuff in the box with instructions, they're off the hook.

[@stevenlavimoniere]

+Mike Malone i never use the stuff never had a problem in 32 years

[@josephwalker1204]

Yo Steve-how did you get a square molex plug to go into a rectangular molex?

[@samuelferrer805]

thanks for the video, I have the L8148E, and I want to change my thermostat for the RTH6580WF. I only use the heat and my old thermostat works with two wires. where you should connect the wires for the other thermostat. Thanks

[@KhanBaba-jv8qi]

Great video steven. Thank you. I have a couple questions. I have peerless furnace and it stops working from time to time. When I move the relay button a few times, it starts working for a day or two. So I guess it is the only problem abd needs to be replace? My second question is that why did you put the damper on hold? Mine is on automatic, what is the difference between the two options? Please advise

[@robbieheart1303]

Khan Baba I have the same issue what did you end up doing to fix this

[@ahumm8280]

After I replaced mine. I decided to resolder the joints that went bad and making them more solid instead of the little dab that surprisingly lasted 10 years after I had my new heater installed. So now my old one should last a lifetime pending the lifespan of other internal parts.

[@evelynvega8123]

Skillful, talent master....

[@williamwallison6743]

What is three cans of operation from the thermostat to the low-water cut out to the burner to the pressure switch damper switch on burner

[@madseasonstaley]

Had a plumber just install the same one and set the high limit at 180 but the water temp keeps rising past 200 and boiling over. Any idea what we are doing wrong? Thanks.

[@realmadrid091884]

I have the same plumber what happened ?

[@xlaw6272]

Maaaan…this was so easy to do… every time contractors come to my home, they always jack up the prices once they see my house…I’ve had to start figuring out how to do a lot around the house… This was A LOT easier than I thought… My molex plug, which was connected to a damper, was causing the Aquastat relay to intermittently not fire up the boiler…had to keep jiggling it to get it to work…probably bad soldering… I was able to fix the problem by simply replacing the aquastat relay… Pro Tip: take a picture before AND after you’ve removed every wire…then just scroll backwards through your pics to reattach them to the new aquastat… Saved myself a lot of money.

[@mmchefoneenjoyyourworkhiri1176]

Very helpful thanks

[@dklucas1]

Excellent job Steve oooo momma steve is working again momma

[@stevenlavimoniere]

+dklucas1 yea steve is working again mama

[@GreatBowlsAfire]

just wondering if that little magnetic switch can be replaced (looks like mine's dead too) or is it all or noting with the whole unit? thanks so much for your time.. (and thanks for the vids!)

[@snoopdogie187]

Any part can e replaced, its just a matter how much time you want to spend. Its probably a generic part that you can find on the internet, somewhere. Its also probably just soldered onto the board. If you have some knowledge of soldering, and a decent soldering iron, this can take just a few minutes to an hour to fix.

[@jeffkaczmarek3577]

My boiler has the exact same problem, can you just switch the relay out instead of the entire control board?

[@keanantemple7622]

Some of those can be a real pain. Then you get the older style that has the jumper in the middle and theres a couple different settings, learned that one the hard way.

[@stevenlavimoniere]

+Keanan Temple i do change out a lot of controls

[@STOPTHEHATE70]

VERY VERY HELPFUL THANK YOU VERY VERY MUCH, VINNY FROM NY.

[@justingonzalez6606]

babys coat is next level mama

[@stevenlavimoniere]

+Justin Gonzalez lol yea they are

[@duramax0103]

My boiler heater has the Honeywell Aquastat Relay L8184E. Their are many versions of this relay. How tell which version to get or which version my existing one.

[@DONALD1951]

llb the existing control will have all the numbers. Most time it will say on the box which controls it will replace. Or maybe Honeywell has the info on line. Or your supply hose can cross reference.

[@pmny3423]

I had the same issue. Called the manufacturer. I don't remember if it was Honeywell or the maker of the boiler itself. But they told me the new replacement model for the discontinued one I had. Even sent the schematic of the wiring in an email.

[@bg147]

Is it ok to take a small file to the relay when it is not making good contact?

[@stevenlavimoniere]

+bg147 i would just replace it

[@GrandWagJeep]

+bg147 Relay contacts are plated, so files are much too rough and will remove the plating. While the relay would work for a time, the contacts would arc and pit away to nothing, and could start to get hot. There's a special tool called a contact burnisher you could use, but if the contacts are too damaged, it just has to be replaced. www.crawfordtool.com/burnisher_gc.html

[@robertdean6222]

Thanks for the video Steve I got my Honeywell control part today and I’ll be putting it in tomorrow. How much for the labor for that ? I’m guessing I’ll save 200 bucks?

[@smitty03281964]

Steve I have an oldie, A Honeywell L8148G, which I don't think they make anymore. My question is will it take the same relay as the L8148E. Thanks for your help and your contribution of knowledge.

[@pmny3423]

Hi, I had the same problem. Was able to call Honeywell last year and they told me the new model that would work for my system. Only thing is Honeywell doesn't deal with these products anymore, and refer you to a spinoff company called resideo. You can either call them or the manufacturer of your boiler for some help.

[@jeffreysmith9147]

@@pmny3423 Thanks a million for your response. I actually took it apart and fixed it. It will get me through this winter.

[@georgesiatos9848]

IT COST ME TO BUY THE SAME RELAY 258$!!!!KEEP GOOD WORKING STEVE

[@stevenlavimoniere]

+George Siatos there not cheap

[@BenjaminEsposti]

+steven lavimoniere Honeywell stuff seems to be expensive in general :/ Then again, I can see where the cost comes from, due to manufacturing extra replacements in smaller quantities (the setup cost for each product is higher ... that's how they mass manufacture stuff by the millions for very cheap).

[@georgesiatos9848]

i agree

[@jeffreymartinez1021]

George Siatos

[@dariogiannetti1452]

Steve on my aquastat relay I only have a wire on C1 is that normal to be wired that way? There is no wire on C2 terminal.

[@sawmanbigtreeslayer2360]

Do you have a circulation pump? Does it run?

[@quianamitchell3741]

good stuff!!

[@MrBrymstond]

Check for any breaks in the solder on the back as they only plate the solder on thin so you have to come back

[@shelby50411]

Have same aquastat honeywell L8148E....anyone know what could cause the 3a fuse to blow next to B1....i have 24 v coming out of high limit...but no 24v at B1 ....im assuming due to blwn fuse

[@pmny3423]

the things have a weak transformer and are known to easily blow. I replaced a little over a year ago and it already blew. I wish there was a competitor. Honeywell doesn't even handle these anymore. They have a spin off company called resideo. If it blows again I will just get some new installs on separate components to fire up the burner and circulator.

[@lupine617]

For being 15 yrs old, that boiler looks like you put it in last week... It is tight to work in those aquastats, dealing with one the other day all pinned in between a water heater, and the wall.

[@jfisch01]

What if I don't have power going to B1 and B2?

[@jfisch01]

What do you charge for replacing the aquastat? I was just quoted $700.

[@DONALD1951]

jfisch01 rip off. It said $275 on the box and maybe $200 labor.

[@shelby50411]

having some issues with utica residential boiler....intermittent wont power off ..stays running when thermostat not calling for heat and thermostat wires disconnected at thermostat...did some testing today after watching one of your video..very odd results... i tested terminals TV...W...T at aquastat honeywell L8148E 3 yrs old...here are results using B2 as ground and no call for heat i get T=24V W=24V TV=0V.....uisng B2 as ground and thermostat call for heat i get T=0V...W=24V...TV=0V........using metal case as ground and thermost no call for heat i get T=0v..W=0V...TV=24V....using metal case as ground when thermostat calls for heat i get T=0V..W=24V...TV=0V these seem very funky and do not correspond to your video on same aquastat..can anyone help me out and explain why i cant get accurate reading using B2 as ground on the 24V side?

[@TheSchwartz36]

Great Video Steve ! Did you say the C2 is the common? If so can i add a c wire from my thermostat to it? Thanks

[@gabosoto2450]

B2 will be your common. C2 is neutral for your 120 volts

[@edmarsh1965]

Hello Steve, Well today is 3-13-2018 Tuesday 11:36 AM. well Honeywell L8148E 1265 Aquastat can be hard to work. there is not much room to get your fingers in them small little holes. Well looks like the BABY DOG is working again.. YOU ALL!!!!! She is a master HVAC MECHANIC too!!!!! mama!!!!!

[@olderrol1968]

The peace you just replaced. How long do they typically last?

[@user-fw6eg3hc8f]

I have one very similar except it's the L8148A1017 as seen as he is rummaging through his truck. It keeps dying apparently a poor design. The current is 4yrs old and dying

[@pmny3423]

I had the first one last many years. The second only a little over a year. Waiting on the third to arrive in the mail.

[@olderrol1968]

@@pmny3423 : I tried a Plastic bag around mind. to prevent dirt from entering

[@juneschalit5531]

Question for Steve or anyone else who can answer. I have heat, but noise is coming from aquastat relay, sometimes loud. If I hit the metal, it goes away. Do I need it replaced? Want to avoid expensive service call. Just had it cleaned and guy said everything looked fine. Of course, noise started 4 days later. Any help would be appreciated :)

[@stevenlavimoniere]

its a bad transformer in control change out the control to a new one

[@juneschalit5531]

Thanks, found out it was just one of the wires rubbing against something inside the aquastat box.

[@joetalley2638]

Your the bomb!

[@lukelange762]

Be careful high low teno with mixed heating may have to use a temp mixing valbetoo control 120 from 189 temp

[@randykocian4738]

Nice video, Steven. Are you concerned the silver contact goop might harden over time? Baby looks good in gray.

[@stevenlavimoniere]

+Randy Kocian yea that muck will harden up and you will never get the probe out ,not needed on brass to copper .copper to steel yes

[@michaelpadovani9566]

Steve the electrician!!

[@stevenlavimoniere]

+Michael Padovani seems that way sometimes lol

[@LayZeeDawg]

Something tells me you, like me, would do a lot of this work for the cost of parts and a home cooked meal for the sweet old ladies

[@electroplumber]

That is a weird set-up but it works, you got her choochin' now mama! lol. As for that "di-electric/heat transfer paste" you would put in on the sensing bulb if the well that it is going into was constructed of stainless, aluminum, steel or any dis-similar metal to prevent electrolysis and corrosion of the bulb and increase sensing speed. If the well is made of brass or copper the pasted is not used.

[@paulmarini2726]

When was the last time you seen anything other than a brass well on a boiler ?the heat conductive paste is just that

[@electroplumber]

+Paul Marini Just before the holidays in fact, it was on a "Hydrotherm-Sabre" boiler, steel well inside cast iron exchanger pitted and slowly leaking into the control damaging the control. the bulb was literally welded into the well, replaced control and well (with brass of course)...Royal pain in the....

[@newanatolia]

+Paul Marini --- why don't they install it at the factory?

[@paulmarini2726]

Honeywell has been controlling temperature for a long time,that compound can only help,or maybe they ship it with the controller because they want to get rid of it ?

[@stevenlavimoniere]

+electroplumber good point thanks for the comment

[@newanatolia]

no jism (lol) in the factory installed control so why add it... you got that right.

[@stevenlavimoniere]

+newanatolia copper to brass is good heat transfur

[@chrisschenosky5161]

where do you put a c wire in at? z or w?

[@pmny3423]

I called customer service of manufacturer and they emailed me a schematic of the wiring.

[@shelby50411]

If the switching relay inside the aquastat is bad why would you change the entire aquastat and not change just the $15 relay?

[@DONALD1951]

der ddd Can’t get it. At least not right away. Nobody stocks them.

[@00tonytone]

The heat control switch stays on when water gets hot but flame goes off . Switch makes sound when its engaged

[@MrBrymstond]

That thermal compound hardens over time and you have a hard time getting the sensor out.

[@MrBrymstond]

If you do use it, apply it on the bottom tip. As you put the sensor in it should be touching the bottom in deep and at a angle on top towards you.