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Hi, i have a big buddy heater. the pilot lite doesn't extend out to heat the thermocoupler. i have taken it apart & cleaned & blew out the pilot assy tubes. i can hold a liter to the coupler and i can get it to stay on, until i remove the liter flame. then it goes out again. i can blow air thru the small pin hole & feel it coming out. i also noticed that if i close off one of the air holes behind the fitting the flame then gets longer. all i can figure out that the very small pin hole is not allowing enough gas thru to allow the flame to reach the coupler. i can not find a place just to buy the fitting with the pin hole in it. all i can find is the whole assy. (ODS Pilot Assembly for the Big Buddy)

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  • floodzonerr Apr 08, 2011

    not sure how this got on with air conditioners but..... the big buddy does not have an adjustment for the pilot lite. i ran a small wire thru the pin hole. there is nothing clogged back to the control valve. i am at a dead end now. i guess the next step is to buy the assembly. still don't think that is the problem.

  • floodzonerr Apr 15, 2011

    hi,
    i put the assembly on the big buddy this morning. it lit right up and within seconds the pilot light stayed on. i think you were right in it being the pilot orifice. thanks for all your help & suggestions.

    have a great day\
    dave

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There is a small screw in the gas valve for adjusting the pilot gas pressure.Its normally right next to the 1/4 inch aluminum tube that feeds the pilot and is sealed with a Philips head screw. Be sure not to remove any "Allen Screws"! Those are test ports for inlet and Manifold gas pressure. If adjusting the pilot screw wont raise it enough, its OK to lower the air mix at the pilot so long as the pilot does not make smoke (Carbon). Let me know if you need anything else. Roger

Posted on Apr 08, 2011

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  • Roger Jelinek Apr 09, 2011

    Can you give me your Model number and the type of fuel your using? Thank you. Roger

  • floodzonerr Apr 09, 2011

    it is a mh18B. i use a 20 lb. tank with a filter. this time i hooked a 1 lb bottle to it. no difference. i tried to get it to stay lit with the lighter again & it would not. i pushed a small wire thru the pin hole & know that is open now. there was no difference in the flame length. not sure where to go from here other than buying the whole assembly. could it be in the control valve. i didn't do anything to that.

    thanks
    dave

  • Roger Jelinek Apr 11, 2011

    Hello again Dave. I wish I had it here. My next step would be checking the gas pressure. If your sure there is no adjustment for pilot pressure, then it has to be another fixed orifice in the gas valve. That makes the manifold pressure critical because any drop to the main burner would also drop the pilot pressure. In conventional burners, we can see the flame and take a good guess. Those radiant panels are so efficient you can't see a flame. They are just red. The working pressure of the heater should be marked on its name plate. Do you have the three step valve and a gauge on the discharge side? Raise the pressure and watch the pilot. Is there a chance that the pilot orifice could have been enlarged. That would make a larger flame but it would be lazy and won't protrude as far. Try the gas pressure and be careful heating that thermocouple. If you loose your main flame, the safety won't shut the gas valve. L.P. will sit in low areas building up fast. If worse comes to worse, I would replace the pilot orifice before anything else. Let me know how your doing. Its become a Quest. Roger

  • floodzonerr Apr 15, 2011

    hi,
    i recieved the pilot assembly & installed it last night. it lit right up and within seconds the pilot stayed on. i think you were right in that it was the pilot orfice. thanks for all your help. it all back together & now just have to head to the mountains to try it out.

    thanks again
    have a great day
    dave

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1 Answer

Not light


check to make sure that the poilet lite flame is touching the tip or top of the thermocouple.
the pilot lite needs to heat up the thermocouple so that the thermocouple opens the gas to the main gas log. a cold thermocouple shuts off the gas to the main gas log or gas burner and a hot thermocouple opens the gas to the main burner.
the pilot lite flame must be touching the thermocouple to heat it up.
pilot lite orface needs to be clear to let the pilot flame gas through with enough pressure so that the little flame can reach & touch the thermocouple. Pilot lite gas feed tube must be clear to let gas through. Use compressed air or a fine sewing needle, or even carb cleaner to clear out orface hole and gas feed line to pilot lite.

important!! WARNING:
if you use carb cleaner,make sure all the carb cleaner is dry,soaked up with paper towell or kleanex tissue and blowed out with compressed air , because carb cleaner can burn just like gasoline; so any carb cleaner must be compleatly gone before you attempt to lite the pilot lite.

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It runs out of fuel


sound like pilot lite is not getting thermocouple hot.
check that pilot lite flame is extending out to and touching thermocouple. If not, clean out pilot lite orface and pilot lite gas feed pipe all the way back to the main gas valve if necessary.
If pilot lite flame is touching thermocouple, then replace thermocouple

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1 Answer

I HAVE AN ATTWOOD WATER HEATER I LIGHT THE PILOT ON GAS AN PILOT WILL NOT STAY LITE AFTER RELEASING THE BLUE KNOB SO I CHANGE THE HEATING COUPLING AN STILL DOING THE SAME THING


Try spraying some WD-40 in hole where thermocouple attaches to gas valve, then twirl a small piece of steel wool in your fingers and insert it in that same hole and twirl it as you push it in to clean surface where thermocouple makes contact. Then blow out with compressed air if possible and then re-install thermocouple fitting snuggly. If that doesn't do it, you'll have to get a new gas valve/control.

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Hi, i have a big buddy heater. the pilot lite doesn't extend out to heat the thermocoupler. i have taken it apart & cleaned & blew out the pilot assy tubes. i can hold a liter to the coupler and i...


It's easier to replace the entire Pilot Assembly. The Part Number is 78422 and you can order it direct from Mr. Heater. For parts call 800-251-0001. It should run about $30.00.

Hope this helps you. Please let me know.

Apr 08, 2011 | Mr. Heater Big Buddy Heater

1 Answer

Pilot lit will not stay lit check it and blew it all out with air .


Hi and welcome to FixYa. I am Kelly

A few things to do here.
1. Make sure the thermocouple probe is positioned directly inside the pilot flame.
2. Disconnect the thermocouple from the gas valve and clean the blunt end of the thermocouple AND the area in the gas valve that the thermocouple blunt end mates to. Any dirt, debris or corrosion in this area will cause the symptom that you describe
3. Worst case if you do not have a blue pilot flame you may have to remove the pilot orifice and clear the pin hole in the orifice.
4. If you have a push and hold type pilot lite gas button... press hard... and let go several times.
5. After all of the above the symptom is still present.... you will have to replace the thermocouple.
I read that you already did the burner tube cleaning.

Most of the time this symptom is caused by the thermocouple either being in the wrong position, a defective thermocouple or a dirty connection surface area where it mates to the gas valve.

Thanks for choosing FixYa,
Kelly

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1 Answer

I have the Mr. Heater Big Buddy and it has been giving me trouble lately. After two years of flawless operation, the unit constantly shuts down, after only a few minutes of operation. I use a 20lb cylinder...


tough one doug, easy way is buy a new gas valve under red knob.
harder to try to fix old one.
the stopage of your mister heater is caused by the pilot lite going out
so what is causing the pilot lite to go out? that is the problem.

inspect the pilot lite and its gas supply tube all the way up to the main gas valve under the red knob control valve. unscrew the pilot lite gas supply line from the main gas control valve and clean out interior of gas supply line all the way through the pilot lite orfice to the open air. It must be totally clean, .like new, including the pilot
orface, in order to work properly.the least obstruction might deflect
or restrict the gas flow & cause poor or no opperation
.
when you unscrew the pilot lite gas supply line from the main gas valve,with a flashlight, look inside the hole, that the gas supply line was removed from.
It may be full of gunk that has to be removed for gas to flow properly. try blowing out with compressed air with a straw tipped blow gun. you may need carburator cleaner to loosen the gunk ,if gunk is present.
WARNING:::
If you use carb. cleaner, it burns like gasoline, so make sure any carb cleaner is blowed of with compressed air or blotted up with facial tissue & totally dried up & removed before firing up mr heater, in order not to catch mr. heater on fire.

If a lot of gunk is in the outlet of the main gas supply valve,you will
need a pocket screwdriver,a paper clip and maybe a sewing needle in order to pick out the crud.
It must be totally clean inside, like new, in order to have a chance at working.
It may still not work if more crud is inside the main gas control valve where you can not get to clean it out.

if you reach the point where you decide to buy a new main gas control valve, first try disassembling your old main gas control valve and cleaning it out,like rebuilding a carb, and reassembling it.
If this works,you dont need to buy a new main gas control valve
and have saved 30.00 plus 12.95 shipping
if it dont work,all it cost you was time & angervation.and you still need to buy a new main gas control valve.

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