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Comfortmaker unit model GUC125A020-N. Pilot light lites but the main burners wont? Any ideas why?

Posted by Anonymous on

6 Suggested Answers

6ya6ya
  • 2 Answers

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Posted on Jan 02, 2017

jeffk14
  • 16 Answers

SOURCE: I have a Dayton gas heater Model 3E225

Does the main blower fan kick on? Also, if the heater is vented outside via a flue pipe, there may be a small (about 3 or 4 inches in diameter) vent fan that kicks on to ensure the exhaust fumes are evacuated through the flue pipe. If there's a problem with that fan, the burner won't light either.

Posted on Nov 20, 2008

  • 2460 Answers

SOURCE: main burner will not ignite Tempstar(NTC5075BFD1)

try cleaning the pilot oriffice it sounds like the flame is weak

Posted on Jan 17, 2009

  • 1 Answer

SOURCE: laars lite 2 pool heater burner not lite

ive got the same problem and am fitting a new thermal generator i will let you know if it works

Posted on Feb 28, 2009

  • 189 Answers

SOURCE: Pilot light goes on but won't ignite main burner?

What kind of heater? is it a gas furnace?

Posted on Mar 08, 2009

  • 10865 Answers

SOURCE: Propane patio heater ignition problem

I would change the thermocouple and here is why:

The thermocouple is the pilot's, well, co-pilot! It is the electronic device that senses if the pilot flame is hot enough to sustain burning the gas fuel from the burner. If the thermocouple thinks it's safe, then it keeps open the main gas valve located in the pilot assembly. If the thermocouple does not sense enough heat from the pilot flame (such as when the pilot is out), then the thermocouple shuts off the gas valve to the burners.
How the Thermocouple Works
So what is this thing and how does it work? Well the thermocouple (technically called a thermocouple junction) is a device that contains two metal wires welded at the ends and placed inside a protective metal case. The thermocouple sensor is found at the business end of the pilot flame and is designed to be placed in the hottest part of the flame. The other end is connected to the pilot valve body. As the thermocouple heats up, it produces a small amount of electricity and when it gets hot enough from the pilot, send a signal to open the gas valve by using a solenoid operated by a 24 volt transformer. The thermocouple calls the shots, and by converting heat to an electrical signal, it allows the gas valve to open or close. Once the gas valve is open, gas is then constantly supplied to the pilot and as required for the gas burners (as called for by the thermostat). If the pilot goes out, then the thermocouple gets cold and produces no electric signal to open the gas valve's solenoid and the gas valve shuts off the gas supply to the pilot and burners

Posted on May 27, 2009

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2 Answers

PILOT LIGHT COMES ON BUT WHEN YOU TURN THE KNOB TO ON IT DOES NOT LIGHT UP THE CIRCLE PLATE IN THE HEATER. IT JUMPS AND THE FIRE COMES OUT THEN IT GOES OUT.


I'm not sure what unit you are troubleshooting but if the main burner is igniting and that main burner flame is blowing out the pilot flame, it's possible the pilot flame orifice needs to be cleaned. The orifice can get stopped up and produce a weak pilot. And I've seen a pilot lite, but be blown out by the combustion of the main burner igniting. Now you stated IT JUMPS. If you mean the pilot flame jumps, as if it gets large then weak and goes out, then the gas valve is giving you trouble and may need to be replaced.

Mar 09, 2017 | Heating & Cooling

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How do I clean or replace the pilot generator on a Jandy Lite 2 pool heater? The pilot will stay lit but the main burners will not come on. Jumpering the gas valve will ignite the main burners and the


if the pilot stays lit and main burners wont fire you don't need to replace the pilot generator! you have an open safety, poor electrical connection or a problem within the tstat controls

Aug 19, 2014 | Pool & Spa

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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the gas is not coming out of the burner, probably due to rust clogging the holes.

Dec 04, 2009 | Water Heaters

1 Answer

Pool Heater Light main burner then goes out


take millivolt reads while main burner is on.i suspect you will see a drop in voltage until you get to point where it will no longer operate burner(around 200mv).if this is the case you probably have poor pilot characteristics due to dirty pilot,pilot out of adjustment ,obstruction or insufficient gas pressure

Jun 21, 2009 | Lite On Laars Lite 2 Heaters: 250,000BTU...

1 Answer

Main burner will not light. pilot has now gone out


shut off the gas at the gas **** and gas valve. the pilot tube is held in place by a 7/16 compression nut. remove it then remove the 2 screws for the thermopile "generator". follow the pilot tube and the pilot assembly should be held in by one or two screws. usually you don't have to remove the main burners. hopefully this helps

Jun 14, 2009 | Lite On Laars Lite 2 Heaters: 250,000BTU...

1 Answer

No able to lite pilot


make sure gas supply is there also clean the thermocouple, if it is fowled or dirty the pilot wont stay lit nor will the main gas valve open

May 24, 2009 | Lite On Laars Lite 2 Heaters: 250,000BTU...

1 Answer

Burners wont ignite


does unit have thermo-cupling

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