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Thanks for the update, I finally had some time today, I got the sensor out...appears to be a photocell light sensor, which needs to be aligned to the peep hole in the front panel so it can see the flame (mine is an H81, it is different than yours) . For what I understand, that sensor will sense...

yes, when turning the knob to heat it goes around 100, but 10~15 seconds after instead the flame turns on the red light comes on...I was so sure that was the K8....but is not the problem

That's what happened to me...my shop went to 90F , it was running after but without flame, have reached hi temps many times before without an issue. It is frustrating, they over engineered those units, the more parts...bigger the price. I disassembled my burner, the injector was clean...they...

Hello, I have a H81 heater, it was running for 6 winters so far, today it stop producing heat after running for 10~15 minutes and I have not found the problem yet. What I have noticed prior this event, there is a small diesel leak from the gas tank (bottom), it was running fine for weeks with...