Goodman GMP075-3 not igniting. Everything cycles as it should but HSI does not glow. Thermostat is set to heat, temp approximately 10 to 15 degrees higher than room temp, blower motor starts, relay clicks as if the HSI should be lighting up, gas valve opens, gas flows, gas valve closes and my house is still at 54 degrees. Replaced the HSI assuming it was faulty and still nothing. Furnace cycles 3 times and shuts down and the LED flashes once. Any thoughts?

check the flame sensor connections . sounds like a sensor problem . check air filter is clean

Check auto settings some thing is holding it off .

A heat pump on the optimal heating day (about 50 degrees ambient) will only deliver approximately 85 degree air as compared to 125 degree air from a fossil fueled furnace. The colder the outdoor air is the less heat there is available to be transferred to the living space. At 30 degrees, the heat transfer capability is getting close to negligible meaning the run cycles will be approaching continuous and eventually as the heat pump along cannot maintain setpoint, the outdoor stat or stats will bring on auxilliary heat in the air handler.

If your ambient temp is below the 'balance point' of the heat pump, the house temp will drop a little lower and most times energize the heat strips through the outdoor t-stat. Your outdoor stat could be set too low for the heat pump to carry the structure all the way down to the balance point so when you turn it off and back on, the lower indoor temp automatically brings on the heat pump plus a heat strip or two, thus the warmer air. Second stage on the stat satisfies due to the heat strip, drops them out of the circuit and the heat pump is left running on first stage heat delivering the perceived cold air.

Your outdoor stat could also be not functioning correctly and not allowing the heaters to come on until the system is turned back on reestablishing the two stage call for heat.

Tons of possibilities and not enough room to list....

The entire igniter should glow, if it does not the temp to ignite the gas is not met and the burners will never light. When replacing the igniter never touch the element part becuae it will create a hot spot on the igniter and fail.

The fan switch is set to turn on at approximately 125 degrees and run until the heat exchanger temp drops to around 105 degrees. With age the sensitivity of this switch varies and summer heat can cause the switch to turn on if the outside temp is over 100 degrees. Only the fan is running, not the burner but you can shut off the power to the unit if this is an issue.

Hello, Check to see if you are getting between 40 and 90 ohms on the ig niter, just turn off power to furnace and unplug molex connector at igniter. After u unplug igniter check the Resistance of the ignitor and if it is extremely high like 180 ohms or higher than you will need to replace the igniter.

I suppose this furnace is fueled by Natural Gas?
(Or is it Propane-- Bottled gas?)

Did the Service company leave you any manual, with your new furnace?
and I would think there was a warranty, for assuring you (the customer) satisfaction, no?
Have you called the people who sold/installed it?
What do they say?

If they did leave a manual-- what does it suggest for narrowing down your possible problems?
Like: Low Fuel-- Low Voltage- Filter Changes, Fan switch problems- or ignition failure problems?

For a new furnace, someone should be right there to do a start-up for you!

Let me know what you learn--

Mack B

Check filter to see if it is plugged. Has someone installed a new thermostat? If so, it may not have been installed properly. Sand off sensor to make it shiny, and be sure all supply and return registers are uncovered.

The burners are not igniting and the timer turned on the blower thinking the burners were already lit by then. You have a burner/ignition problem. Either the ignighter or themocouple is bad

This is a step system for heat ,,, step 1....... thermostat calls fo heat and send power to the vent fan motor, it proves its running by a small suction on the red tube which closes a switch and tell the c. b. to go to step--2 lite the hsi this glows &in20 seconds....step --3 the gas valve opens and dump raw gas in the venturis tubes.. and proves it has a flame thru the flame sensor. and step 4... the box heats up and closes the fan switch..