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I have a goodman gmv furnace and im getting error code 3 which says the pressure switch is stuck when i jump out the switch nothing happens i think it has to do with my ventor motor cause it doesnt start at all

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Hello,Try unplugging one lead wire to the switch.The inducer should start then.

Posted on Oct 06, 2010

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My Goodman High efficiency furnace stopped working and I getting 3 flashes from the red light in the viewing window. I know that this is a malfunction code but I can't find out what it means. Can you help?


On the panel with the wiring diagram, there is an error code chart. I think 3 flashes is a pressure switch problem. Check your air filter, condensate pump or hoses. Check the small hoses going to the pressure switch, check your air intake and exhaust vents. Remove any moisture or debris. Make sure all venting pitches back to the heating system and no low spots are holding water.

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1 Answer

Getting 3 blinks on error code LED, checked voltage at the pressure switch, and it is getting ~24v from both wires. What else could cause a "pressure switch stuck open" error code?


i take it the flash code 3 blinks refers you to the pressure switch...see the schematic. If this is what you are saying than lets move on... the voltage across the pressure switch should read 0 if the furnace is running and calling for heat. you dont need to check each wire to ground but across the two quick connect tabs. you will either read 0 or 24 volts (or there about). if you read 0 the switch is closed and functioning as designed. if it reads 24 volts it is open and there is not enough negitive pressure to close it. this can be due to a leak in the rubber tubing or a clog in the pressure switch, tubing, or induced fan housing connection nipple. the flue pipe may also be clogged or an improper cap is used at the termination. last is the wiring could be faulty going to and from the pressure switch. Hardly ever have we found a broken or faulty switch but it could happen. trust the board in most cases.

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1 Answer

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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!

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1 Answer

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Are you saying no lights on the control board light up as well? If so, check the door switch, Emergency switch, breaker and lastly, the power to the furnace. If you can see a light but the system is not working, check for any error code (flashing) and look at the wiring diagram on the back of the service door. Also, there is a small fuse that you may want to inspect. If you do have a light on, jump out R and G on the control board and make sure you push in on the door safety switch. Let us know what you discover!

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1 Answer

GOODMAN CMA80905CXBA FURNACE. INDUCTION BLOWER NOT ENERGIZING. GETTING 3 "BLINKS" FROM DIAGNOSTIC LIGHT (LOW PRESSURE SWITCH OPEN). THE A/C WORKS & THE BLOWER FAN COMES ON WHEN THE STAT IS IN...


the pressure switch is closed before the draft motor closes it.the board is telling you that this is not right.pull the wire(either) off of the pressure switch to see if furnace tries to light.if it does,you should replace the pressure switch.

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5 Answers

Goodman furnace I think


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!

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