CBT_ : Communication Error U_D_
To avoid serious injury follow all warnings and instructions in the manual. Wear appropriate personal protective equipment.
Verify AMZ MZLP4 is turned on by confirming disconnect switch of the heat box is in the ON position.
Disconnect AMZ MZLP4 from AC power. Check wiring to switch. If wiring is good, replace the AC disconnect switch of the heat box.
Replace AMZ MZLP4 control board.