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Sorry for the delay in answering. In desperation, I actually removed the insulation from the discharge temperature sensor and found that the sensor was actually broken in two. Fortunately, the local...

Jimh92801,

Thanks for your quick response.
Sorry, I was a little hasty with my original note. Error code 4 is: "Discharge temperature did not reach appx. 90 degree F within 1 hour of compressor...

My York Stellar heat pump runs for some time normally. Then the thermostat light starts blinking 4 times (error code 4). However, the discharge line gets normally hot. It will work OK again for a...