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Re: GMPN 120-5 FURNACE
If you want some help on this I will need some more info. Does the unit shut off completely? does the fan run after the burner shut off, or is off simultaneously? do you have a digital thermostat or the old type?
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There can be many causes of this. First check to be sure you are using the correct gas type (natural gas or propane) for the heater. It may need to be converted to the correct gas type.Then check to make sure your venting is not blocked (bird nest, etc). Sometimes it's a soot build-up inside the chamber and flue, which can be caused over time due to one of the above problems I mentioned.
Hello,sounds like you have a dirty flame sensor. This is a metal rod on the oppositenside of the hot surface ignitor. turn off power to the furnace and remove the flame sensor, then use steel wool and clean the flame sensor and reinstall. Next turn back power to Furnace.
After four years I do not thing you have an effective warranty even if the company still in business. you need to open it first and clean it from any builod up dust and check the switch to see if it is working (thermostate)
sounds like its not venting properly...it likely is shutting off on a "Spill switch" or "Vent safety switch"....check the vent/chimney first off.....also the pilot could be dirty..,..a lazy pilot tends to blow out easily....pilot should be blue and sharp,,,big enough to fully envelope the thermocouple
If the igniter lights the burners the ignitor..... is not bad. Its like a light bulb.... it works or ot doesn't.
You are describing a dirty flame sensor. Dishonest contractors will sell you a new ignitor but clean the flame sensor when the are installing the ignitor. It is located at the opposite end of the burners than the ignitor. It has one wire going to it. Remove it and clean the rod with a piece of fine grit sandpaper. this should be done every year before heating season.