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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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.
There is a induced draft motor that will run first to purge the combustion chamber and induce a draft, a pressure switch closes proving an induced draft exists, thus allowing the spark and pilot gas, or hot surface ignitir and gas to pilot rsil and /or burners, a trial period for ignition about 30 seconds each for 3 attempts will be made and if not lit by the 3rd attempt it locks out, requiring a reset of power to unit to reset the module or circuit board etc. 1st see what motors running, is it the flue exhaust motor/induced draft??
Check near the squirrel cage fan and see if there is a sail switch. Sometimes these are used to confirm air movement prior to firing off the gas furnace. It is simply a square piece of metal on a stick that attaches to a microswitch. This switch is then depressed when the fan pushes the air (and the metal piece) allowing the burner to fire off.
Hope this helps.
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.
It sounds like it is still receiving a "call" for heat from the thermostat. First check that the thermostat is set for gas heat and not electric.(There may be a jumper or dip switch on the back). Read the directions with the thermostat.
Secondly, Verify that the wiring at the thermostat is correct. (R- to red, W to white, G to green etc.)
Third, If the first two do not fix the problem, then there is definitely a problem in the thermostat wire between the furnace and the thermostat. (usually the "R" and "W" wires will be crossed or shorted to the sheet metal around the furnace. You may just have to replace the entire wire. Best of luck!
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.