I have a Goodman GMS9/GCS9 Gas-Fired Warm Air furnace and it's not working.
The Induced Draft Blower starts to run but there is no furnace
operation.The Integrated control module diagnostic LED is flashing 3
flashes.The possible causes listed in the manual say: 1.
Pressure switch hose blocked, pinched or connected improperly. (l
took of the front cover of the furnace and looked at this rubber Pressure
switch hose and it looks fine to me) 2. Blocked flue and/or inlet air pipe, blocked drain system, or weak induced draft blower. with no visible blockage.l inspected the drain system that comes out of the side of the furnace and that also looks fine, with no visible problems.The Induced Draft Blower sounds fine when it kicks on too, sounds strong with no audible odd or weird noises eminating from it. (l do not have any idea how the pressure switch setpoint could be off since l have never adjusted it and l have no idea how to adjust it or what would even be a proper adjustment of it.As far as malfunctioning switch contacts, l do not know why they'd be malfunctioning, the furnace is in a clean dry furnace room with little or no dust and very little moisture.Visibly, all of the contacts look great. 4. Loose or improperly connected wiring. (l do not know how any of the wiring could be loose or improperly connected because the furnace has run for 3 years with no problems) This problem all started about 4 weeks ago when the furnace would run, but never for long enough to get the house warmed up to the adjusted thermostat tempurature of 69 degrees.It was keeping the house heated at around 65 degrees at that time.Now it has entirely stopped heating whatsoever, with the blower turning on and then the Integrated control module LED goes from steady on to THREE quick flashes, meaning that there is a problem.The flames never ignite and then the blower eventually turns off. The gas flow is definintely on to the furnace and l have just recently installed a new filter. Any help would be greatly appreciated, I am layed off and l really do not wanna pay for a service call here.
Disconnect the intake & discharge vent pipe from the inducer
blower to see if that makes a difference.
Pull the drain tubing from the trap to see if any water is being held
back. If so the trap assembly is plugged & needs to be cleaned out. Water
being held up in the heat exchanger or vent blower housing will affect the
pressure switch reading.
Disconnect the pressure switch tubing at the pressure switch & by blowing through it slightly see if you can tell if any debris is blocking the port. Since the pressure switch has a diaphragm that moves back & forth during start up & shut down water or debris can get pulled into the port or the tubing.
My dh is an electrician and you would be surprised at how often
a wire will come loose. I would check each wire carefully and make sure
that it is connected properly. If most of the unit is working fine, then
it sounds like it is a wiring issue.
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