Question about Goodman GMS90703BXA Heater

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Pilot on but no heat to radiators

Our heat is not on , the pilot is lit but no heat is in the radiators. we don't know alot about plumbing or heating and we have a newborn in the house, so we need to do something. don't have much money either. any help would be greatly appreciated in terms women can understand(those of us not educated in this area)

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Re: pilot on but no heat to radiators

There is a gas valve inside the heater (is it on?), There is also sometimes an electric starter that goes bright on start (is it?), Do you hear whirring noises on start? Is the valve switch set to ON?

I have one of these and if the pilot (electrical) turns on and the gas is not flowing then is senses a heat failure and stops. Then on the control board light blinks (seen through plastic cover).

These also have to spin an exhaust fan, that bearing sticks, if it fails to turn, the unit will fail to start after 1 min. Does any of that makes sense?

Posted on Nov 10, 2007

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What is a thermocouple and what does it look like

A thermocouple is a bi-metallic junction that when heated gives an small electric output. The tip of it sits where the pilot light is ( and it is a copper tube going to the gas valve) and the pilot light heats it up. It creates electricity after it heats up (which is why you have to hold the pilot light knob down when lighting) and opens the gas valve to keep pilot light lit after you let the pilot knob go back up. When it stays lit without having to hold it down, (make sure the thermostat is set low so it doesn't light the burner while you have your hand down there) then you turn the pilot knob to on. It should stay on and you can set the furnace to heat and raise the temperature where you want.

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The pilot is on,, but gets no heat

Well she oughta light off with the green knob turned up all the way.
This valve has a temp control mounted in it. Once the pilot is lit you move the
knob to ON and if it is cold in the room she oughta fire off. If it don't then the valve needs to be replaced. If yours works on 24 volts and you have the knob on the on position and the thermostat is on and the transformer is working then the valve oughta fire off. If it don't then the solenoid is bad and the valve needs replacing. IF you have a pilot generator then your gas valve solenoid work off of voltage being produced by the generator. That type system is very simple. a 2 wire thermostat on the wall makes the circuit and the generator powers the whole she-bang. If the solenoid is open on the valve OR if the thermopile / pilot generator is weak then when the themostat comes on the pilot simply goes out. Let me know you need further assistance.

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1 Answer

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Have you tried changing the ThermoCouple? (TC)

The TC has to feel heat from the Pilot, to generate the electricity that the valve needs to both let the pilot stay lit, as well as to allow the main gas valve to open.

The TC has to get just enough heat-- not too close to get dirty from soot, and TC's do need to be replaced occasionally--
Let us know what you have done, and what clues you can give us now.

Mack B

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If your pilot light will not stay lit when you release pilot light button then chances are that your thermocouple is bad. Make sure that the tip of thermocouple is directly in line with pilot light. Tip of thermocouple should be cherry red if it is properly placed. If pilot will not stay lit then replace it. If you aren't sure about placement of thermocouple you can heat thermocouple with a seperate heat source. If you do this and pilot light stays lit then reposition thermocouple in pilot flame. If it still won't keep pilot burning then replace thermocouple. Hope this helps. Thanks.

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1 Answer

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My honeywell gas suspended garage heater will not come on when the t'stat calls for heat. It is a heat only unit and neither the fan nor the blower motor will come on. The Heater is getting power to it...

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