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Goodman gmp150-5 Three blinks of trouble code

I had a repair man out here the other day, he was here 15 minutes and told me the circuit board was bad. I questioned his diagnosis, especially when he wanted over $500 to repair. I went on the internet and found a replacement board for it and installed it myself. Much to my surprise, the furnace did the same thing. I checked the exhaust vent and looked around the vent pipe and saw some like white or salty deposits around the pipe vent joint. It looked like ash. I disconnected the pipe and vacuumed around the vent and tried the furnace, this time it started up and ran fine until I tapped on the vent pipe looking for looseness then the flame went out and went into shutdown mode. Any suggestions?

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  • nablus Nov 21, 2008

    It blinks three times and does not start, I called a repair man he shook the wires then it worked and said if it stops again the board is bad ,now i have no heat should I trust the repair man and change the board or may be a loose wire somewhere

    Thanks

    AMY

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The problem sounds like it is with your combustion fan motor,,,there are two types. one has a syntrifical swith the others have a round box with a hose going to it that is a pressure switch, if it is the motor does not have a rubber hose coming off and has two wires instead than that is syntrifical and your only shot would be to take the moter loose and shake it out make sure there is not something that fell down in and kept it from turning, other wise u have to replace. by the way it will be the small motor at the base of the vent pipe. If it is the hose type try unplugging the two wires from the little round box that the hose goes to and connect them together if it runs by bypassing that then either the switch is out or something is plugging the hole or hose,,on the side of the blower moter where the hose comes out try poking something through the hole and make sure it is not clogged I bet this is the kind u have and the problem. good luck

Posted on Oct 25, 2008

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