Re: Older Goodman gas package unit combustion and...
There is a limit switch tripped somewhere. it is either the main limit in the firewall orthe limit switch on the small fan (inducer) that is tripped some of these are manual reset try pushing the button in and see if that stops it.
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Does the condenser utilise head pressure control to maintain head pressure? if so is the unit fully charged...r22. r410 Freon.If the unit is an older model. the fan motor only runs at 850 r.p.m design flaw. The newer units now run the fan at 1075. R.p.m. I have installed many Goodman split systems and was having problems similar to yours. Hope this. Helps you
check your themostat fan mode switch to see if it in on or auto. It should be in auto. If this does not stop indoor fan motor, (it may take up to 2 minutes for the fan to stop, preprogrammed shutoff in the thermostat and fan control cards may make you think the fan has not stopped ) If this does not stop the fan the fan control board in your air handler has a green wire shorting to 24 volt signal in the theromostat wire or the contact on the blower control card is stuck and will need replaced.
Check the relay or sequencer that controls the blower if it has one of those. If the fan is controlled by a circuit board then you problem may be there. If it is controlled by a circuit board then you can check for power at the fan connection when the fan is supposed to be on. Then there is always the possibility that you blower motor is burned out. You can use and ohmmeter to check the motor windings. You said you checked the thermostat, how did you do that? If you install a jumper between the R and G connections the fan should run if everything else is OK.
Make sure you have bled your gas lines. If any air is in the lines, it will cause the unit to do exactly what yours is doing. The relay "click" you hear is the gas valve opening, but if there is no gas, it will not ignite. This is common for a new install. I hope this helps or at least points you in the right direction! Good luck!
sounds like you might have a bad control board. try putting a jumper wire on the control board low voltage terminals R and G your fan should come on and run if you have 120v power to fan motor. double check that you do have 120 leaving board and going to motor. if no 120 bad board if you do have 120 bad motor. if it is the board it likely has a bad blower relay which is common in amana models and goodman equipment.
the fan induction motor produces a vacuum, check of orofice on motor is plugged by pulling hose off switch end and putting in mouth while running and sucking, this will make a whining sound immediately if no restriction. the fans are controlled through the board by vac., swich, limit sitches, and timers in the board itself. maybe a bad ground on flame sensor.
goodman boards really have to have a very good ground. make sure the ground wire is securely attached. also even though you say the limits are all good, you need to check the wiring that goes from one limit to the next. they should make a loop that goes from the plug at the control board to each limit and then back to the plug. take the plug loose and locate these 2 wires. ohm them out. if it is open, your problem is somewhere in the loop. the fact that the blower is running all the time tells me the board is not getting the signal it is looking for from the limits. I have seen some goodmans that have a rollout problem at the burner box and it melted the wiring to the limits on top of the box.it is hard to see so you have to look closely. also if this is the case, you need to have someone check the heat exchanger for a crack. the rollout usually does not happen till the fan starts blowing while the burners are on. if this is the case, you do not want to run the furnace for any reason as this is a carbon monoxide risk.
There appears to be a short in the unit. Not sure where. The power to the fan is not interrupted completly when the fan shuts down, still feeding voltage to the fan, keeping it running slow. Before checking the wiring, please turn off power first.