Question about Goodman GMS90703BXA Heater

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I have a Goodman Furnace Model Number GMP075 and there are no manuels or scamatics on the covers or anywhere on the furnace. The board is shooting me a code blinking 3X's. I am trying to find out what code that is .

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This is a pressure switch error.
You could have a couple of issues which could cause this code.
There could be a blockage in either the intake or the exhaust pipes.
The easiest way to check for this is to undo the coupler on the intake pipe inside the furnaceI have a Goodman Furnace - 2.gif housing and let it draw in air from the furnace room for a couple of minutes and see if that is a fix.
I have done the same with the exhaust, but only for a minute to check for a blockage(as you will create some CO while operating this way).

The drain sometimes causes problems. I have had to use a small piece of wire(like a coat hanger) and push through the fitting at the bottom for the collector box before, where the hose ties onto the furnace burner box.
If you have a build up of condensation in the secondary heat exchanger this can cause problems.
The easiest fix for this is to ensure the furnace is sitting with a slight tilt to the front(like 1/8th inch back to front), so that the condensate runs to the collector box and out into the drain.
You could also check to make sure that the vent motor is getting up to speed (just in case a bearing is getting tight and slowing it down enough to not let enough flow through to trip the pressure switch.

Use a brad nail and poke out the intake from the blower to the p-switch... and that is probably the issue here.

Thanks for using FixYa!!

Posted on Oct 01, 2009

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