JoelP
Well-known member
My Coleman Mach Model 7535D871 basement heat pump furnace combo just stopped providing heat on a very cold night in Elko,NV. This will not heat on electric or propane. The thermostat calls for heat and a blower turns on. For propane the burner fires up. In both cases after 2-3 minutes it shuts down entirely.
When it starts up the green LED on the control PWB flashes its normal pattern. When it shuts down the same pattern continues, saying that the logic doesn?t detect an error. It behaves as though the 2nd stage is not firing up.
I would love to get my hands on a shop manual, but maybe one of the experts on this forum has experienced this kind of issue. My guess is that a relay may have failed on the PWB, but one would think this would produce an error code. Any idea where I can order a replacement PWB?
Any input on this would be appreciated.
When it starts up the green LED on the control PWB flashes its normal pattern. When it shuts down the same pattern continues, saying that the logic doesn?t detect an error. It behaves as though the 2nd stage is not firing up.
I would love to get my hands on a shop manual, but maybe one of the experts on this forum has experienced this kind of issue. My guess is that a relay may have failed on the PWB, but one would think this would produce an error code. Any idea where I can order a replacement PWB?
Any input on this would be appreciated.