Trouble shooting
Check power supply
Check power cord
Check receptacle for damage
Verify that the controller is plugged in and
operational.
Check that the Asterisk is showing on the
display if not press and hold the on key for 2
seconds if that fails to work contact your
service personal.
Check that the controller power cord is
connected and that the ends are locked
Check that the controller cable and ends are
not damaged
If available try a second controller or cable to
determine if the ECU or the controller is at
issue
If the second controller fails to operate check
the fuse located behind the upper door in the
ECU replace with the same size fuse 2 amp
32 volts
If the airflow to the condenser section is
blocked or obstructed by dirt the unit can shut
down due to over pressure, disconnect the
supply cord and allow the unit to cool for
several minutes, clean or unblock the
condenser and retry the ECU
This is normal during cooler weather the ECU
will switch to resistance heat, as the
condenser thaws it will switch back to heat
pump mode
When the condenser freezes the ECU
switches to resistance heat only, the
resistance heat is nominal due to running at
120 volts this is normal, you may want to
augment your heating with an additional heat
source
ECU not operational
Inside blower operates but ECU will
not start to cool or heat
No display on the controller
If the ECU is operating and suddenly
shuts down but the internal blower
continues to operate
Condenser coils frozen up
Very cold weather, the ECU does not
seem to be supplying much heat
