Question about Goodman GMS90703BXA Heater

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Water in pressure switch line

I have an amana model number (according to tech) gdc070x30b and every year on startup the pressure switch has water in it and I pay a guy to blow the water out. Is there a fix for this? Cost me $75bucks again this yr! It is a horizontal unit in the atlanta area and is located in a crawlspace. Thanks for any help or steer to somone who can help

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  • jgeraldg Nov 20, 2008

    Thanks for the suggestion, will give it a shot. The repairman claims he has one just like it and he has to do the same thing every year! How much should I charge him for the fix? LOL


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Relocate the pressure switch so ir is higher than the original location. If the installer knew what he/she was doing they would have done this already!!!!!

Posted on Nov 19, 2008

  • ricks hvac Nov 20, 2008

    Charge him double because now it should be fixed


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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!

Oct 28, 2007 | Goodman GMS90703BXA Heater

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