Goodman gmp075-3 gas furnace and the flame cycles for 4 sec
Goodman gmp075-3 gas furnace and the flame cycles on but shuts off in around 4 seconds, then tries again and again, etc had to replace the control board due to flooding b18099-13
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Fan purge for 30-45 seconds. During this time, a pressure switch is actuated by the running of the purge fan, proving the control board the purge fan is running.
After purge and purge prove, the hot surface ignition and or spark begins. After a few second delay, the gas valve will open. The control board then monitors for flame prove through another sensor located near the burners. If there is no flame within 3-5 seconds, the gas valve closes. It will repeat this process, usually 3 times, before it shuts the system down, which requires a power down of the system to reset.
I have seen trash get into the hose between the purge blower and the purge switch. But you could be having other problems.
On the last gas venturi tube there should be a flame sensor located in the flame to prove it exsists, if its coroded the spark can,t jump back thru the moisture molecues in the gas to prove it has a flame to tell the circuit board to keep the gas comming. Just reomve the flame snsor and sand itand replace itback. T. Y. V. M.!
I suspect that the flame is not traveling to all the burners within a given time so the flame sensor is shuting down the gas valve. Clean out the flame rail where the flame travels and carefully brush off the flame rod with an old tooth brush.
The first thing to look at is the flame sense rod.
Shut off power to the furnace, remove, clean sensor with steel wool or sandpaper then reinstall the sensor. Reapply power and it should run properly.
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!
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