Uh oh

So the heating system has been chugging along with the house getting progressively warmer. Tonight I come in, and pump is off and a red light is on. Get out the book, put it into diagnostic mode, and read a fault code for "FP1", defined as a thermistor being below a limit setting of unknown value. Whatever THAT means!

Time to figure it out!!! I was about to return the badass 2 heater we rented!

More soon....