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Model GMP100-5-REVA light blinks 4 times fan runs constantly

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Re: model GMP100-5-REVA

You could have a limit switch that opened. On the reverse side of the furnace access panel there will be a diagnostic chart indicating what 4 flashes indicate. If it is an open circuit, why is it open? Did the unit get too hot and why? Unless you have the diagnostic capabilities, call a professional.

Posted on Jan 04, 2008

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