Water Heater Pilot Light & Thermopile Troubleshooting!

How does it Work? How Many Milli-Volts Should the Thermopile Generate? What Problems Can Occur? How Should The Pilot Operate? How do You Fix it? All Explained on this 750 Millivolt Thermopile powered Honeywell Gas Valve Control. Supervision is needed by a licensed HVACR Tech while doing this as Experience and Apprenticeship garners Wisdom and Safety.
Tools Used In The Video
UEI DL479 Multimeter with temp sensor amzn.to/2jtsUbJ
Thermopile Honeywell 750 Millivolt - amzn.to/2Ru68Ud
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⚠️ Disclaimer:
Information in this video is intended for educational purposes only. Any work related to the topics in this video should be performed by licensed technicians or by apprentices under the supervision of licensed technicians. AC Service Tech LLC is not responsible for any possible damages or injuries caused by the use or misuse of any information provided. ▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬
#hvacr #hvacr #hvactrainingvideos #hvactraining #hvactraining101 #acservice #acservicetech #millivolts #volts #thermopile #occur #pilotlight #pilot #hvacproblem #hvactools #gasvalve #valve
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[@acservicetechchannel]

Tool List- www.amazon.com/shop/acservicetech Support- www.patreon.com/acservicetech For those that are looking for the tools used in the videos: (Linked Below) Thermopile Honeywell 750 Millivolt - amzn.to/2Ru68Ud UEI DL479 Multimeter with temp sensor amzn.to/2jtsUbJ Magnet Jumpers- amzn.to/2PyKPQZ Alligator Jumpers- amzn.to/2PxqJXn Fieldpiece ST4 Dual Temp Meter amzn.to/2wc1ME3 Fieldpiece Bead K Type Temp Sensor amzn.to/2DBwKfs Fieldpiece Wet Bulb Temp Sensor amzn.to/2RRI7Tw Fieldpiece TC24 Temp Clamp amzn.to/2qHLyjZ Yellow Jacket Refrigerant Gauge Set amzn.to/2aenwTq Refrigerant hoses with valves amzn.to/2aBumVI Yellow Jacket Gauge set & hoses amzn.to/2vLVkV9 Yellow Jacket 4 Port Manifold w Hoses amzn.to/2BkuGIq FieldpieceSMAN360 Digital Manifold Set amzn.to/2BdoaD4 FieldpieceSMAN460 Digital Manifold Set amzn.to/2nB4Fe6 Compact Ball Valve for Refrigerant Hose amzn.to/2KUisW8 QuickDisconnect 90 for refrigerant hose amzn.to/2MMtVcg JB 6 CFM Vacuum Pump amzn.to/2nqbvo8 Appion Blue 3/8" to 1/4" Vacuum Hose amzn.to/2uYlVyc Appion Red 3/8" to 1/4" Vacuum Hose amzn.to/2uYg6Ro Appion Valve Core Removal Tool amzn.to/2uYr8WL Yellow Jacket 1/4" by 1/4" hose amzn.to/2umtcod CPS Vacuum Micron Gauge amzn.to/2v1nM3O Supco Vacuum Micron Gauge amzn.to/2v1JRiA RectorSeal Bubble Gas Leak Detector amzn.to/2ckWACn UEI DL389 Multimeter amzn.to/2xAdaJf \Air Acetylene Torch setup amzn.to/2aQalsb 15% Silver Brazing Rods amzn.to/2gVLyLc Nitrogen Regulator amzn.to/2bXdR5f Nitrogen Flow Meter amzn.to/2brvoBg Other tool links can be found in the video description section. Shop through Amazon! Your Purchases through Amazon provide a means for channels such as mine to earn advertising fees from all purchases after clicking through. Prices are the same as normal- www.amazon.com/shop/acservicetech

[@theadmiral5425]

I was able to diagnose and repair a HW heater because of this video....Thank you Craig (AC Service Tech)

[@danstarnes2375]

Lots of technicians have knowledge and ability, but can't convey it to others very well! Sir, you are the man! Thank you, I learn so much from your presentations, one and all!

[@acservicetechchannel]

Thank you very much and make sure to check out the articles I wrote, the quizzes, calculators and the podcasts at www.acservicetech.com thanks!

[@parickyates]

I’m so glad you added this video, because thermopiles are different. Thanks, this is an excellent tutorial.

[@jkos8121]

You just saved us a ton of money! My parent's hot water heater quit working and the pilot wouldn't stay lit. Replaced the thermocouple and still the same. Figured it was the gas valve which couldn't be replaced so my dad was on his way to get a new tank. Watched this and saw the thermo disk can be reset, sure enough that was it! Thank you!

[@michaelallen7747]

Which part exactly is the thermo disc?

[@glennhanson6843]

Nice work. Was just checking on what you had for MV readings with pilot on. Had another today, the Honeywell valve acting up. So far it's been valves and not the power piles on all of mine. Prior to these power pile valves so they can have a pretty blinking light I think I replaced ten water heater gas valves in thirty some years.

[@cartago494]

Every video has so much information. I watch your videos and always learn something new. When someone aska a question about ac I always recomend your channel. Thank you for all your videos.

[@stuckinmygarage6220]

Wonderful explanation! No filler; straight talk; best show and tell. Thank you!

[@acservicetechchannel]

Thanks a lot!

[@user-ng4dx1sv4s]

Very thorough , educational and beneficial as usual ! Hope you had a good Christmas Craig ! Happy New Year

[@acservicetechchannel]

Yes it was a Very Nice Christmas, thanks Thomas! Happy New Year coming up!

[@acrepairnearme]

Awesome! Sometimes customers asking to check the water heater. Now I'm totally know how it's made. Pretty same technology, wall heater, fireplace, old-fashioned furnace millivolt gas valve. Thank you!)

[@acservicetechchannel]

Glad to help, thanks Tapch MC!

[@nolanzorn6820]

Amazing video thank you. I feel fortunate that this is the same model I have. Most videos I see cover a non integrated thermocouple setup. And for only like $40 you can replace the entire pilot assembly to basically rule out 90% of problems you described. Thanks a bunch!

[@Keo0oo]

I love this guy man. I wish I was your apprentice! Master craftsmen in this field!

[@acservicetechchannel]

Thank you very much Keo GG!

[@Chungustav]

You really are great at explaining this

[@jimdoss9369]

That was really helpful. The setup to show what's happening is perfect. I am impressed. And thanks!

[@acservicetechchannel]

Glad it was helpful!

[@salhin82]

Thank you very much sir, I have liked and subscribed because I was able to troubleshoot and fix my water heater at home. Awesome video!!

[@AlexanderClark-zv9ne]

Very good and compact unit. Fits well under the sink and provides IMMEDIATE hot water!!

[@rogerf3622]

Absolutely the best video on this topic! Thank you. I did notice the LED started flashing once when the solenoid pulled in, and then twice once the main burner was ready to ignite. So I assume its just measuring millivolts from the thermopile.

[@acservicetechchannel]

Yes there is a board inside with a status LED, thanks Roger!

[@williamjohnson1264]

The best water heater video ever! thumb up for this demonstration of the inner working of a water heater in a open demo of the workings. Helped me get my water heater back to working order. THANKS!! THUMBS UP!

[@acservicetechchannel]

Glad to help William!

[@tjinytjiny6615]

I changed out a thermopile and my WH still wouldn’t fire up. I finally found a video that highlighted the importance of installing the thermopile all the way in. What I thought was all the way in due to hitting against a cover was not. I reinstalled the thermopile all the way in after loosening a screw the initial video never mentioned. The result of the correct installation of the TP, was a working hot water heater. Thanks for the info here you provided, I’m sure it will help some..

[@barkster]

awesome video this is exactly what I was wanting, thanks for sharing

[@greg3391]

Great video. Clear and easy to understand.

[@normandannug6118]

Perfect video. Exactly what I was looking for. Thanks!

[@Stevenowski]

Do you teach at a vocational school? I've been in the trade for 35 years and find you to be an excellent instructor. I couldn't do a better job myself.👍🏻👍🏻🔥

[@acservicetechchannel]

Hey Steven, I did yes. I have been putting a book together on refrigerant handling and been working on trying to finish that since teaching at the end of last school year, thanks

[@michaelmaclachlan2152]

@@acservicetechchannel I got a copy of your book and it's excellent. Thanks

[@DanO181919]

Quality information, thank you for sharing! Can you show us how you would do a maintenance on a water heater.

[@acservicetechchannel]

Danny, Thanks and Thanks for letting me know what you would like to see!

[@imagetf]

Great video!! You helped me get my unit backup and running. Thank you so much!!

[@jkim412]

Awesome Video. I used your tip on cleaning the thermopile with the steel wool. Worked like a charm and saved me money and Headache. Thank you sir.

[@acservicetechchannel]

Thanks John!

[@PaulHVAC1]

Craig, as usual another great clear instruction video by a knowledgeable technician . Keep up the great work Cheers!!

[@acservicetechchannel]

Thanks a lot Paul!

[@tomdolan8811]

Your working model setup is absolutely the best on the web at educating people interested in dealing with issues associated with this particular gas water heater control‼️Thanks for making it available👍

[@acservicetechchannel]

Glad to help Tom, thanks for letting me know!

[@anthonyoliver6023]

Thank you sir!!! This video has helped me repair my water heater twice!!

[@idahodad1]

Excellent explanation and demo.

[@acservicetechchannel]

Thanks Tim!

[@codyspendlove8986]

Rarely to I find exactly what I am looking for on the first KZbin search. Thank you! This was perfect.

[@acservicetechchannel]

Thanks for watching! I'm glad the video was helpful!

[@Back2BackLakers2010]

I really learned alot watcing your explaination as to how the thermopile holds the solenoid open.

[@kennyw7453]

Great content and demonstration.

[@acservicetechchannel]

Thanks a lot Kenny!

[@rtcfpv1012]

Wow! Pretty clear tutorial. Thank you.

[@acservicetechchannel]

Glad it was helpful!

[@ThePachucoMix]

Thanks for sharing your knowledge 👍

[@mrofnocnon]

As a licensed G1. Excellent video!

[@humbertovalenzuela9130]

Great info!!! May god bless you!

[@Head2ToeTheatrical]

Great video. I feel confident that I should be able to check this now to see what the problem is. If I get to something I can't handle I can then get a professional.

[@acservicetechchannel]

You can do it!

[@davidknopsnider1204]

Great video, used it to troubleshoot a friend's water tank issue (fouled thermopile).

[@acservicetechchannel]

Glad it helped

[@raulacbo4469]

Thanks for the great video! I’m impressed that you

[@lh5723]

Great detailed video! I'm currently having issues with this exact model. my boiler's pilot light keeps going out, the unit is in a rly small boiler room next to a separate furnace unit that heats base board radiator pipes. could not having enough ventilation/oxygen intake cause it to keep going out or is it more likely a specific part that needs to be cleaned/replaced? appreciate any advice~

[@armandolopez5826]

Eres un buen instructor.

[@acservicetechchannel]

Thanks!

[@deanmartin1966]

Great information. Thanks for sharing

[@acservicetechchannel]

Thanks a lot Dean Martin 1966, I always appreciate your comments!

[@deanmartin1966]

@@acservicetechchannel You're welcome

[@samuelvalenzuela4541]

This man is the best technician around the world

[@acservicetechchannel]

Samuel, I am really glad that you enjoyed the video, thanks!

[@billybassman21]

All these years I never knew how a thermocouple or thermopile worked. I only looked it up because I saw the flashing light on some water heaters and was wondering how the light got its power. Very ingenious concept.

[@jackpast]

Great video, Craig. Coming from the old school water heaters where you lit a piece of newspaper to light the pilot, I understand the reason but hate the piezo igniters. That little window they give you is almost worthless to see what is happening at the burner/pilot. Had a funny/nerve wracking thing happen years ago...the gas company decided to add a new lock-out valve to my gas main. We went to the movies before they arrived. They never notified us about this prior. After they were done, they left the valve off and put a tag around my door knob to let me know I had to turn it on and re-light any pilots ( I had water heater, furnace and stove.). When we returned from the movies, the tag had blown off the door knob and we never saw it. About a half hour later I heard “hon, there’s no hot water!” I went to check the water heater...not lit...after laying on the concrete floor trying to light the pilot with no success for a few minutes, I yelled up “turn the stove on!” “It won’t light!” Went upstairs, discovered no gas coming from stove burners, went outside, saw new valve in closed position, turn on and re-lit all pilots...and about a week later found the tag in the bushes next to the door. Ugh.

[@acservicetechchannel]

Ha ha that's horrible, nice, thanks Jack!

[@acservicetechchannel]

Jack, would you be willing to write a quick 1 to 2 sentence testimonial in reference to my HVACR teaching ability in school or online, questions answered, or the content that I have put out to date? I may display this under the book section, Q & A section or another section of my new the website. This new website, acservicetech.com should be up and running early next week. No hard feelings if you are unable to. I appreciate it! This could be replied here or emailed at [e-mail] thanks a lot Jack!

[@JoseJB0]

Great video, it it's very common that customers ask if you can or know how to check the water heater or fireplace. I think they are very similar, milivolts gas valve. Please correct me if I am wrong. Thanks for all the very detailed videos. I have learned a lot. 👍💪💩

[@acservicetechchannel]

Yeah fireplaces, freestanding stoves, water heaters, and some furnaces are powered with millivolts. It is a simple flame proving and system powering method, thanks J B!

[@seemorebutts3428]

Excellent video, thank you!

[@acservicetechchannel]

Glad you enjoyed it!

[@repairitdontwreckit4257]

Well explained. Thanks

[@wjwwillow]

Man... This is a huge help. And you definitely know your craft. I am in such a pickle right now. 🤣 Don't suppose you'll field a question or two? Again, thank you.

[@FranciscoMartinez-uc3hx]

Excellent video.

[@dizzolve]

Excellent video thank you so much

[@acservicetechchannel]

So nice of you

[@charliexu1099]

Very informative Video！ Great info for me the homeowner to understand my water heater. My question is mine only gets around 410 mv. For the past week, my pilot is turned off a few times by itself. Looks like i should replace my thermopile, right? Is the thermopile you listed below a universal model that works for different brand water heater as long as it has this Honeywell gas valve controller? BTW, I got a wrong part ( thermocouple) today, and i am going to return it and get a correct thermopile.

[@jill552]

That was a great video. I can find out very little about my five flash temperature sensor failure alert. A Rheem video shows the sensor near the burner assembly. I have an A.O. Smith water heater. A.O. Smith is of no help. Everyone says it needs a new gas valve but I can undo the thermopile and trick the water heater into making enough hotties water for my bath. Please advise. 😐

[@hozerhvac4406]

Great lesson thank you

[@acservicetechchannel]

Thanks a lot Cory!

[@morningstar7645]

Great +Great info ,very educational.

[@jamesrecknor6752]

EXCELLENTLY DONE

[@YTsux24-7]

Craig's pyrotechnics. Best shows on the internet hands down!

[@acservicetechchannel]

Yeah, controlling fire, it is what we are meant to do! ha ha! Thanks Tom!

[@RayRay-nb7tn]

Yes I agree. I dropped another site. Now I'm fully on board. This GENTLEMAN is the best in the feild to explain hvac work. Thank you sir.

[@acservicetechchannel]

Always glad to help Ray Ray!

[@michaelmclaughlin6]

@@acservicetechchannel what if I changed out the thermopile igniter and pilot tube as a unit and I turn pilot on and hold the button but never get status light to come on. As soon as I let go of pilot button the pilot goes out.

[@jumex-hj7qq]

excellent presentation!!!!! thank you !!!!

[@acservicetechchannel]

Glad you liked it!

[@charliesmith5189]

Great video!

[@raw4dis84camaro]

Hello . Is the solenoid for the push button replaceable? My pilot cuts off when I release the button

[@bejooalaan1448]

Very informative, thank you

[@acservicetechchannel]

Glad it was helpful!

[@dae3xt]

good stuff. thank you !

[@sam999ber]

Great video

[@ivanvrincean5996]

Thanks a lot! Very helpful and informative. Do you happen to know the parts number for the thermal switch shown on the video?

[@fixngoplay]

Thank you for this video, I now know that I have the proper milivoltage going back to the board but my pilot light will not stay on. So I’m thinking the problem is the gas valve, actually just the board that is in the gas valve assembly. Thank you again.

[@acidfuzzpedals9986]

Thanks for the great video. Can you explain how to test for a leak at the gas line ferrule connection at the pilot without having an external working model like you have in this video. Testing all external connections is straight forward, but I don't understand how to test this internal connection at the pilot in the field? Any suggestions?

[@utubepro7742]

Great explanation

[@acservicetechchannel]

Glad it was helpful!

[@john0119]

TY, GREAT VIDEO

[@acservicetechchannel]

Thanks John!

[@tarikpompy8984]

Man great video. I'm a little confused between the Thermopile and the thermocouple. They seem to function the same what is the difference between the two?

[@acservicetechchannel]

The thermocouple is just one dissimilar metal junction that produces 30mv with a certain amount of heat where as the thermopile is a bunch of junctions equaling up to 750mv with a certain amount of heat. The 750mv and 750mv gas valve was used on older floor furnaces and is used on systems that are not ac powered such as fireplaces, freestanding stoves, water heaters and some furnaces. Then 30mv is used primarily on water heaters along with the 30mv gas valve. Thanks Tarik!

[@sakutasu]

Thanks ! this video helped me out

[@acservicetechchannel]

Awesome Kim!

[@brthooper1]

Wow!!!! This is how instructional video's are supposed to be made!!! Very helpful and so well explained! Thank you!!!!!!!

[@acservicetechchannel]

Thank you very very much Brett!

[@Alex-yk6he]

Happy new year!!!

[@acservicetechchannel]

Thanks Alex, Happy New Year to you too!

[@acservicetechchannel]

Nice Bass!

[@sanp2457]

Very Good

[@phillipjoy8191]

Great video.😀

[@acservicetechchannel]

Thanks Phillip!

[@neverwasthere]

Thank you for your video. You are a very knowledgeable man. My issue is that my water heater is over heating. At the lowest setting "LOW", the water temperature is still measured to be 140F (should be 105F at LOW and 120F at HIGH). This is a 50 Gallon AO Smith LP gas water heater, 4 years old. A plumber was called in and he replaced the Honeywell LP Gas Controller. It's been for two days after the controller replacement and the hot water is still burning hot on the "LOW" setting. Called the plumber and he says he is out of trick. What could it be? Thanks!

[@johncote2776]

I believe that style of gas valve control can be replaced without having to drain the water heater, unless the thermal bulb is bad inside.

[@jeremywhite1062]

Pilot went out today, AO Smith with honeywell, went and bought thermocouple and ended up I needed thermopile , reassembled everything after cleaning old thermopile and pilot would light but wouldn't let me turn up temp

[@edmalts]

I just opened up my water heater burner and turned it out just like you have it. I cleaned everything on it after that,,, I fired it up and worked perfectly !!!! However after making installation it acted up again. Would not stay on. So I took screws off and pulled assembly about 1/2” and it WORKED !! So my problem is ==== lack of air in the housing burner.

[@phillipmedinarepairdcmotor835]

Thank you sir😮

[@humanology-six]

Thx

[@ED99LAM]

very good detailed info on how the system works and step by step methods. great. would be nice to see more details on the thermal cutout check.

[@acservicetechchannel]

Look up acservicetech thermal limit switches, thanks!

[@1weirddoe571]

Isn't there a high temperature cut off Thermo cut off inside the valve that sticks into the water heater tank? Or is that not needed anymore since you have that thermopile safety thing down on the burner chamber plate? So the tank has it's thermal cutoff and the burner chamber has a separate thermal cutoff and do you have to have both or you just need one? And if the valve has its own Hi temp, thermal cutoff, is that a one time cut off and you have to replace the valve then or have things changed and the high temperature thermo cutoff in the valve can reset itself with these new or updated valve versus the older valves?

[@michaelallen7747]

If the thermopile gets wet is there any coming back from that? These thermopiles aren't available at my local hardware stores and the supply stores are closed today.

[@mlyons31]

I have a Whirlpool water heater that the status light doesn't come on. I have 720 mV at terminals on control valve, but valve solenoid doesn't engage. I have replaced the Control Valve module, but does the same thing. Any advice would be appreciated.

[@skybluefeather397]

there is a natural bend at the end, how close should that pilot be to the main head... thanks

[@luismontoya5398]

Hello I have a Bradford white water heater that keeps turning off, already replaced thermostat but it keeps turning off do you know what wpuld be the reason?

[@joeduvall3891]

I bought this water heater kzbin.infoUgkx8G49mV71sAzUl9shXyLW-r3XgHH9EVh1 for use in my bus conversion. I installed it under my kitchen sink and it is fed by a high efficiency on-demand LP water heater. It is both a backup hot water source as well as a water saving device since we have hot water on demand rather than having to wait for the gas on demand water heater to finish its ignition cycle. I decided on this water heater due to the fact that it only draws 1300watts when it's ON instead of the 1500 watts that most Water heaters this size draw. In an RV a couple hundred watts can be a big deal. With very low standby losses, I don't have to worry about excessive power consumption. When propane is not available for our gas water heater, in conjunction with our low flow shower head there is enough hot water available to shower, albeit we won't be taking "hotel showers." Also very happy with the recovery rate of this water heater. Granted, it is quite small, but it does exactly what we need it to do.

[@zhilee636]

I measured the voltage and it tops off at 600mv but the pilot light doesn’t stay on. I just replaced the controller and initial test it did stay on but controller was flashing 2 lights then 5 seconds off which indicates low mv, system will reset. After that, i could get pilot to stay on. This video pilot light triggers the solenoid at 200mv. I assume the thermopile needs to replaced?

[@10MrThuglife]

I have the same setup and the pilot starts a flame but I can’t get the burner to light. And I’m not getting any green light flash or anything? I’ve checked the voltage and it doesn’t go up when I hold down the pilot button

[@fredjones43]

I would appreciate it if you would do a video like this with a thermocouple style water heater.

[@mathman0101]

Thanks!

[@acservicetechchannel]

Thank you so much!!!

[@geojor]

great, thanks …

[@acservicetechchannel]

Thanks Pei!

[@craigwflys]

Mine has a connector (with a yellow and white wires) to the com plug. Any idea what this sensor is for?

[@SinnerSince1962]

I fought mine all day, actually while learning the theory behind how it works. I am thinking my gas valve is bad now. I don't get any light at all on the controller. The thermopile works as it should.

[@alkalinecrusader]

What do you troubleshoot for if it won’t light at all? I have gas being supplied to the controller but it won’t light at all and there is no flashing light on the box. I am holding down the pilot switch and pressing the igniter. Does that mean I have a faulty igniter?

[@rachelthompson434]

The pilot light on my parents hot water heater quit working and now won't spark or light. They've had to light it a few times in the past but now it won't do anything. What could that be?

[@hunter-rl8dt]

The main gas supply line that gets attached to your thermostat what is suppose to be inside the tube just purchased a new burner assembly and there is a inner tube that is cut and crimped inside my main supply tube that goes to the orifice is this safe to install

[@clintwilliams9424]

Good video man!!! I have a question. My status lighy is not coming on at all. I can light my pilot light right after ai hear a click on the control valve. I dont know wether to go get a new thermopile or a new gas valve (honeywell). My meter doesnt work well and i really dont have the money to get a new one...now I can light pilot, wont get a status light but I can turn burner up and after a min or so the burner shuts off...trys to re light but it wont and I dont know if its gas valve or thermopile. On my meter with my girlfriend helping me...it got up to almost 400 mv but then my meter says 11??? Lol. I dont know man. Need ur help

[@ScottPrincePhoto1]

Great! You just saved me 300+

[@acservicetechchannel]

Glad I could help!

[@whitesheatingairappliancer7101]

Great video thank you. Question can the gas pressure be adjusted?

[@RockoRocko-rz7kx]

Ron White Yes the out let can be adjusted by a screw. U need to turn in to increase. Should be 3.5 wc outlet pressure for ng and 7 wc for lpg

[@whitesheatingairappliancer7101]

@@RockoRocko-rz7kx thank you.

[@acservicetechchannel]

Hey Ron, On this version, the pilot and outlet gas pressure are non adjustable. The older style 30mv gas valves have an adjustment for the outlet pressure on the top. This one is also fixed at 10" wc and is stated on the side of the valve. Thanks Ron and Rocko99!