Question about Goodman GMS90703BXA Heater
What does that mean??
Furnace attempted to start but failed after so manay tries. This may help you.
Sequence of operation, Gas Furnace.
On a call for heat, the 24 volt thermostat sends a signal to the control module. The control module will indicate a call for heat with a light on the control either blinking or remain solid depending upon model. The inducer (exhaust) blower will purge all gasses from the furnace and pressurize a pressure switch. Once the pressure switch tells the module to continue, the electronic ignition will energize and send 120 volts to the ignitor. The ignitor will glow and you will be able to see it if viewed thru the small inspection port. Once the ignitor gets hot enough, it sends a signal to the module opening up the gas valve (24 volts). Either a pilot will come on or the burner tube will ignite then spread the flame to all burners. Lastly a safety sensor will be looking for a certain temperature within a few seconds and the furnace will continue to operate and the room air blower will turn on in a minute or two.
What could go wrong? The unit will not run if there is no signal from the thermostat (bad thermostat or broken wire), the control module does not sense a signal from the thermostat (bad control), the inducer does not energize (bad motor), the pressure switch does not close (blocked vent piping, bad switch, plugged condensate hose), the ignitor does not energize (bad control, bad ignitor), the gas valve does not open or there is no gas (bad gas valve, broken wire, no gas), the pilot does not lite (dirty pilot), the burner does not lite (bad burner, plugged orifice, not enough combustion air), the flame does not spread to each burner (bad flame spreader, dirty flame spreader, more bad burners), the flame safety sensor does not detect flame (dirty or bad flame spreader, bad flame sensor, broken wire, bad control), or the room air blower does not energize (bad fan motor, bad control).
Most newer furnaces will have a diagnostic center or control built into the control module. You may be able to view it as it is running thru a small viewing port. Some models will require the removal of an access panel prior to finding it. On the reverse of the access panel, there will be a diagnostic chart that will aide you in understanding any error code recorded (usually a blinking light).
This is why we technicians earn the big bucks!
Posted on Dec 05, 2008
My led light keeps blinking once i have a goodman furnace what could it be please help me its cold
Posted on Dec 08, 2009
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Posted on Jan 02, 2017
this is a overlimit cut out,
whats happening is the internal cabinet is getting too hot, so the system should shut down until that temp drops below safety levels,
this particular problem, usually deals with air flow, your not getting the proper amount of air through the blower.
i would check, your filter here, usually this is the first thing to check before trying any sort of re4pair
Posted on Oct 17, 2009
Witch blower is running, the inducer or the systems blower?
System blower could mean the the high limit is opening and shutting down the systems gas train, I would check this out first.
The other problem could be with the pressure switch for the gas train, it is supplied from the inducer motor, check to see if it is operating fully.
HSI boards do go from time to time, this sounds more like a system control problem.
Posted on Jan 25, 2008
SOURCE: goodman furnace 4 blinks
The limit switch is usually a little fiberglass board (2" x 3") with two wires going to it. Usually held in by two 1/4" or 5/16" hex screws. These go bad if you have insufficient air flow through the furnace.(dirty filters,undersized supply or return ducts)
Sometimes they will reset if you tap on them or clean them.
The limit control will have a rating printed on it stating its trip and reset temps.(L170 - 30f or something like that) Make sure to replace it with the same rated switch.
Posted on Jan 02, 2009
Hi, what you have to do is where you see this light flashing, there is a circuit board. Remove the panel. If everything goes black, you have a door switch on the perimeter that you can tape down to restore power to the furnace. On the panel, you will find a error code sheet glued on it telling you what the flashes mean. 3 flashes may say you have an open pressure switch, or 4 may say the inducer motors off or something else. It will almost troubleshoot itself. Find out what the 3 flashes mean and if you cant figure out what to do, contact me and I will walk you through it. It sounds like you have a dirty flame sensor, or an intermittent problem in the ignitor module. Check it out as it will tell you.
Posted on Feb 25, 2010
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