Goodman Furnace Model GMPN060-3 Three Blinks Diagnostics.

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Old 12-12-08, 01:51 PM
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Goodman Furnace Model GMPN060-3 Three Blinks Diagnostics.

I have a Goodman Furnace Model GMPN060-3. I get three blinks biagnostic code. I changed venter (motor assembly) and pressure switch. Still the same three blinks. Moisture drain path is clean and free of debries. After the new parts, furnace started once, but would not start again -- same three blinks. Reset all power switches and waited overnight for things to reset, but still will not start i.e. three blinks. Blower fan is OK, runs on manual. Replaced new filter.

When the problem first started the problem was intermitent. Furnace would start only in the morning when everything was cold. When it had gone through one cycle it would not start again but give the three blinks. So I changed the pressure switch (1.19", part B13701-48) and the venter assembly (Fasco 7021-9087) based on inside panel diagnostic guidance.

Any guidance would be helpful. Thanks.
 
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Old 12-12-08, 06:45 PM
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3 blinks indicates that the pressure switch is not closing. Is the tiny hose between the pressure switch and vent blower housing hooked up? If so, disconnect it at the blower and suck on it like a straw while starting the furnace. If the furnace fires, there is an obstruction somewhere in the venting system. Double check the condensate lines and water trap for a clog.
 
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Old 12-27-08, 02:38 PM
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Thanks for the suggestions

I checked the venting and found blockage due to bee hive (yellow jackets???) nest remnants. The furnace pipes exhaust in the back yard where we have a bee problem. Thanks for your feed back and suggestions. It avoided me a costly call from the repair person.
 
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