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GMP050-3 heater, gas turns on and lights for 5-7 seconds and just as thr igniter goes dim the gas shuts off. after 3 cycles the erd LED flashes on/off at a 1.5 seconds on and 1.5 sec off Gary

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After the gas turns on, it is the flame sensor's job to see that ignition took place and send 24v to the gas valve. If it does not do this, the gas valve shuts down as a safety precaution. After 3 tries, the furnace will go into "lockout" and will not let it attempt to start again. The lockout can be resolved by turning off the power to the furnace for a couple minutes and then turning it back on. Sounds like the real problem is a faulty flame sensor not sending 24v to the gas valve. Sometimes they can be cleaned with a piece of sandcloth. This will cure failure to recognize the flame due to carbon build up on the sensor. Otherwise, the sensor will need to be replaced. Hope this helps!

Posted on Dec 16, 2008

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