Question about Goodman GMS90703BXA Heater
I am not sure. There is no model number or brand name. I assume its goodman because of the condensing coil. They were installed at the same time. Its a 3 ton unit. The control board has the red light flashing 3 times and I do not have the code diagnostics explanation. Its a gas furnace. We turn on the thermastat and set it high enough to come on but it does nothing. Not a thing. The a/c works just fine. Can you help.
Ok, a flashing 3 on a Goodman control board usually means that the pressure switch is tripping. A few things will cause this. One being a restriction in the exhaust or combustion air inlet. The second could indicate a faulty inducer blower motor and the third would be a blocked or bad pressure switch.
With the front cover off and door switch taped down, Have a helper turn the thermostat up to 75. You will be watching the circuit board for flashing lights and in a few seconds the inducer motor (the small fan hooked to the exhaust) will start. If this does not happen, we either have a bad circuit board or blower motor. If the fan starts rotating, inspect the hoses going to the small circular pressure switch. Sometimes they may get either water or debris in the hose and not allow the switch to sense pressure. If the hoses look OK, the igniter will glow an orange color and you will see this if you look thru the small viewing port. IF no glow, you could have a bad pressure switch, a bad ignition relay (found on the circuit board) or a bad igniter. OK so if the igniter glows, a few seconds later the gas valve should click open and send gas to the burners. The orange will turn to blue. If this does not happen, you have either a bad gas valve or bad circuit board. Finally if you get flame but it will not stay lit more than a few seconds, you may have a restriction in the burner gas train, a bad gas valve, a dirty or bad flame sensor or not enough gas pressure.
Knowing the sequence of operation will give you the needed information to talk with a service technician and cut down on diagnostic costs.
Try looking on the back of the furnace access panel for both model number and a diagnostic schematic. This will confirm what the flashing 3 code means for your unit.
Sorry, without knowing the model number, this is the best I can do for you. Good Luck!
Posted on Oct 29, 2007
I also have a problem with my Goodman gas burner. I too have 3 flashes. I first checked the hose - no water and clear as can be. I then jumped the pressure switch, and the iginition glowed (with is brand new beucase i broke it on accident). I then purchased a new pressure switch and replaced that.
Still wont fire!
This unit is 3 years old.
After that I then disconnected the flue pipe before the T that goes up and out of the attic/roof. Still wouldnt fire. I did this becuase i cant get out on the roof.
Still doesnt fire, still 3 flashes...
I also checked the wire connections and all is fine.
Any other ideas?
Posted on Oct 31, 2008
I've got an induced draft blower with a fan blade rubbing on one of the metal brackets. My error code was '3 flashes' but the inducer wasn't turning on. I checked for 110v and it's there but still no inducer blower. Then I happened to notice that the inducer was laboring to spin. I shut down the power and manually spun it in clockwise direction. I think its rubbing against the metal bracket that holds the motor to the black plastic housing.
I can get it to run now, after spinning it manually I've freed the blade enough that the inducer will run, but it whines terribly as it's rubbing. I don't want to destroy anything further. Is there an adjustment for this blade position?
Posted on Feb 10, 2010
I need the fornt cover for a goodman furnace built in o2 mod num is gmnto6o-3
Posted on Feb 09, 2010
Check your condensation line from the inducer motor, i had water in the cup that once full discharges to the drain (it did not drain). it interfered with the pressure sw
Posted on Jan 10, 2010
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Posted on Jan 02, 2017
SOURCE: Goodman furnace
double check your wiring. R terminal on the furnace will provide 24 volts to the t-stat. W terminal in the t-stat will send 24 volts back to the furnace W terminal to turn on the heat. G terminal in the t-stat will send power to the G terminal in the furnace when the t-stat is switched to fan on. Y terminal in the t-stat will send power to the Y terminal in the furnace which in turn will send 24 volts to the A/C outside. The C terminal in the furnace should be connected to the c terminal in the A/C outside as well as to the T-stat. Check the fuse again
Posted on Jun 21, 2009
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