20 Most Recent Mr. Heater Thermocouple Questions & Answers

The tank size dosn't matter all you need is a feed line This looks like a spicific tank appalaction but just feed it remotely with a normal propane tank and a feed line and save your self the head ache as long as it dose what you want it to do ist cool

Yes, the thermocouple is a separate part from the valve. It's not necessary to replace the valve assembly.

It could be, I want you to try this and see what happens. First clean up the thermocouple with steel wool until it looks new, now carefully try to relocate it (bend it) so it is at the top center of the pilot flame. This is the hottest part of the flame. You may even want to close off the damper slightly until the main flames get hot then open it all the way. Now I am not telling you to close the damper all the way but simply close it partially until the main flame is established for a little bit(two to three minutes). If this works you have a strong draft and just continue to light it the same way. A good draft is not a problem as this vents carbon-monoxide out of your home, and thats a good thing.

you need to get wall switch and wire to this changed as it is impossible to test these for faults as can happen after a few hours of operating (usually to do with the heat of the fire place dso if it has a fan hopefully you are using it it'll keep components cooler in heater and stop things like this happening), but i'm assuming that cable to wall switch runs down side of heater or something and i'm guessing its got hot maybe melted to side of heater and may have damaged wall switch so i would replace both, this has really been the only problem i have had all year with heaters and its due to turning the fan off which you can do in some heaters that arn't entirly designed for heating, if you are heating with a gas heater its important to run fan no matter how noisey it may be and there not that noisey really just turn tv up i'd rather be warm through winter than hear my tv so i'd rather hear a fan than the news, most of the time it sounds more intresting anyway and i have heard of mechanics that have pulled out melted fans from heaters because they were off, i have found cables starting to melt too so its a safety issue too and lastley if your not running fan heat goes up flu waste of money so i think its important and would have maore than half of call outs less as it has been a problem with heaters with turning fan off, i may be wrong but i'm guessing this may be the problem and if you do use fan the cable to wall switch may be down side of heater making contact with a hot surface and melting causing problem i would also do switch aswell as heat could have damaged to as cable would have conducted heat to switch

Do you have a digital cam? Post a pic here if you can.

Is the flame fully surrounding the thermocouple?

If so, then remove the seat at the gas valve by wrenching it off the valve.

Look at the inside of the screw fitting you removed, wipe it clean with a dry cloth and re-install it.

When you get the fitting screwed down all the way by hand, DON'T DO THIS WITH A WRENCH, PAY ATTENTION HERE

FINGER TIGHT ONLY AT FIRST

When you get the fitting screwed down all the way by hand, then pick up your fitted wrench and snug the fitting in place by turning it 1/8 to 1/4 turn more, thereby making the connection to the thermocouple.

After the seat of the thermocouple is screwed down to the bottom by hand, using only your fingers at first, the connection to the micro-voltage is made by SNUGGING the fitting in place using approximately 1/8 turn.

Use approximately 1/8 to 1/4 turn with a fitted wrench. Try not to use an adjustable wrench and definitely do not use pliers or vice grips.

If after you've followed these directions up to 3 times and still cannot get the flame to light, you may likely need a replacement thermocouple.

Careful here, doing this while you don't have time or are in a hurry can do catastrophic damage to lots of stuff, including your wallet.

Let me know how you get on won't ya?

Take some video if you can. Who knows, you might become famous, like me!

lol not.


Russini

Why not take out your old thermocouple to a store that sells furnace parts for propane fired units?

The important thing is unit length and the right fastener and the rest should take care of itself right?

Good luck and be careful!

I had this same problem with my heater. I cleaned the propane tube where the flame comes out (after it’s off and cooled down) with a Qtip and some alcohol. After removing some cotton, it will fit all the way down to the end of the tube. Repeat until it comes out clean and stays lit. I had to repeat with 91% rubbing alcohol and more Qtips, and most of the cotton removed.

Check out the pressure switch . and the snap disk .

check the pressure switch and the snap disks

Tis atomizing the fuel so it'll burn hotter/better. up their loud tis normal.

You will probably need to remove the pilot orifice and clean it out use a small needle or orifice cleaning rod. The pilot flame is not big enough to keep the thermocouple engaged.

Yes no flame to thermocouple it will shut off

With multimeter check l1 to ground on control board. Also check 24vac to ground to verify high and low voltage present at board.

chw=eck flame sinser need clean

There is nothing on line about heat shields I would go direct to M r heater with model and serial number and ask them .

may be low fuel flow video below have some suggestions. https://www.youtube.com/watch?v=L5UNAvPWXNE https://www.youtube.com/watch?v=JU8dS8XNU7k https://www.youtube.com/watch?v=VLbA_DFlqoQ https://www.youtube.com/watch?v=s58YeeyD0zE https://www.youtube.com/watch?v=kdnOhjev3BU manual below troubleshooting starts page 13 https://www.mrheater.com/downloads/dl/file/id/275/mr_heater_20_30k_btu_propane_vent_free_manual_2016.pdf