Question about Heating & Cooling
Replaced control board. Burner and combustion motor kicks in when heat request is activated. May I change the blower motor wires to the LOW speed terminal or is the fan switch stuck closed at the thermostat? No error codes. Blows cold air during non-heat cycle. Old board would not engauge main blower only.Worked if combustion cycle started and I provided external power to main blower motor with thermostat hot-wired/bypassed. Dave in Seattle.
If you bypass tstat, meaning hot wired blower, does the blower cycle on and off by touching and removing red with fan?? If yes than obvious problem in tstat. I was leaning towards a bad relay but if you can make it work by passing tstat, there's you problem.
Posted on Jun 23, 2017
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Posted on Jan 02, 2017
SOURCE: Goodman Furnace Intermittent
Does this piece, have an economizer and or vent draft options installed? I hope not. If not, I had the same sort of problem with a Payne unit, sort of the same style. First things first. bypass the thermostat by making a jumper or connecting the red to the white wire on the thermostat, see if that stops the problem. Repair techs are all to anxious to replace the board anymore. If the repair man installed a relay to bypass the blower control he is in over his head, the limit switch determines when the fan shuts on & off based on temperature. There is a relay on the control board that basically carries the load for the motor. Dont have anything else installed that need not be there (there is enopugh crap already from the factory) If you want to really fix this I need to know if you have and can read a volt/ohm meter and can understand a wiring diagram, hopefully yours is still there. let me know after the thermostat thing and I can walk you through this.
Posted on Dec 25, 2007
You should be seeing 120 volts to the igniter. Anything less requires either a replacement of the transformer, start relay or control module.
Posted on May 30, 2008
Remove all power from the furnace, it is likely the brain in the furnace is need of being reset, from the battery replacement, why did you change the battery, was there an indicator telling you to change it?
Many times just removing all the power to the furnace will do the trick with a reset, if not let me know and we will go from there, but it sounds like the main brain is confused or bad, more likely confused, so try the power removed first.
Than let me know firstname.lastname@example.org
Posted on Nov 22, 2008
Some one missed the wiring diagram. I believe its like this:
L1 = Line 1 = (Hot all are same thing)
Now usually the black is for AC and connects to a normally Open (NO) contact on the blower relay.
The heater speed (either red or blue) go the the normally Closed (NC) on the blower relay and on one side of this wire or contact on the relay it goes to the heating blower thermostat on the furnace.
The remaining wire (blue or red) you tape off.
L1 also feeds the Run Capacitor on 1 side and the Brown wire feeds the opposite side
The white wire is Neutral and goes to the neutral on the main line.
If this helps you please rate me accordingly and good luck.
Posted on Mar 13, 2009
it sound like the blower motor may be seizing up. try spining the blade by hand to see if it feels free or not. the motor could be trying to turn but can then tripping itself out on overload. (most motors have built in safety overloads which will trip during an overcurrant event. aka too many amps.) you may have to replace blower motor
Posted on Mar 22, 2009
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