Goodman GMS90904CXA Wont ignite, light blinks 3 times
I just flipped thermostat switch to heat and reset the weekly settings, with thermostat on auto, the fan comes on but the furnace doesn't ignite. I checked the furnace ,the light was blinking 3 times.I did a shutdown and startup procedure but still have the same results.
Goodman heater with 3 blinks which says pressure switch/vent. I replaced the pressure switch and still works only once every few days. After it stays off 1-2 days it will work till it reaches the temp on the thermostat but once it shuts off it will have to sit again. Unit is about 5 yrs old. Checked the vent, the hose and its good. Can anyone help me please.
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Take a jumper wire and jump out the R and W terminals on the furnace. The heat should come on. If it does not, you have a bad board. A steady blink indicates no call for heat. You may have either a broken thermostat wire or a bad thermostat if unit fires when you jump it.
· The furnace control checks for an open main limit (this limit is normally closed). If the limit is open, the furnace will remain inoperable until the limit is closed. During an open limit the circulating air blower will be energized. The status light will blink four (4) times. · The room thermostat reacts to a demand for heat.
· The control will then check to insure that the vent pressure switch is open. If, at this point, the vent pressure switch is closed the control will blink two (2) times and will remain inoperable until this situation is corrected.
· The venter blower is energized.· The vent pressure switch will close when it detects a pressure in excess of its setting. If the pressure switch fails to close the status light will flash three (3) times.
The sequence cannot continue until the pressure switch closes.
· After a pre-purge of about ten (10) seconds the electronic ignition device will be energized.
· After a slight delay the gas valve will open.
· The burners will ignite and the flame sensor will detect the presence of flame. The ignition device will deenergize. If the sensor does not detect the burner flame, the gas valve will close and the ignition cycle will be repeated for a total of three attempts. If, after the third attempt, the presence of flame is not detected, the furnace will go into a lockout condition for one (1) hour. It will then repeat the ignition cycle. This one (1) hour lockout and retry will occur indefinitely.
· Thirty (30) seconds after the main valve is energized the circulating air blower will be activated.
· The furnace will remain in operation until the demand for heat is satisfied.
· Once the demand is satisfied the venter will shut off, and the circulating air blower will shut off after the field selectable time off is attained.
· The furnace will remain dormant until the next demand for heat.
I googled Goodman trouble codes, and found 3 blinks is an open pressure switch. At the top of the furnace there is an induced draft motor. It forces the combustion gases, after ignition, through the flue pipe. Try giving it a little turn. You should be able to see the little fins, like a small fan blade. With it in the off position, no demand hot heat, try spinning that lil fan blade in either direction. And the try the heat. If that don't work, its likely the water leak, from the coil, has damaged the motor or control board, and you need a technician. Hope this helps!
Ok, you either have a inducer fan issue or a pressure switch issue or a plugged vent pipe. The inducer turns on to establish a draft for the exhaust. If it is not working you will get this error code. If the pressure switch does not sense pressure caused by the inducer, it will give this code. If either the intake pipe or exhaust pipe is blocked (even y just a little) it will give you the same error code. If the condensate hose or receptical is plugged, again it will give you this error code. Good Luck!
If there is no blinking light, then the unit is not seeing a call for heat or cool. My guess is a lose or broken wire in the thermostat circuit. Try and putting a jumper across the red and white heat terminals inside the furnace and manually closing the door switch. If you get heat, it's telling you there is a wiring issue. If you get nothing, it's a bad circuit board.
Cycling the external switch on the GMS series will not help you. That switch is for A/C only. At the unit found inside the house, remove the front cover. If there is a door switch, tape it closed. Now if the thermostat is calling for heat, the unit will cycle as you mentioned. When the unit does not start, check for a blinking light on the circuit board. After three unsuccessful tries, the light will blink a code (2 blinks then a pause up to 9 blinks than a pause). Make a note of how many blinks you see. On the reverse side of the access panel you will find a diagnostic schematic. It should tell you a fault code corresponding with your blinking. This will give you a starting point where to look. If the codes are not found there, check inside your owner's manual. Or you can call Goodman at 713-861-250. Get back to us with those codes and maybe we can help you further.