Operator called and complained that the heater in the cab was not working. Wipers worked, and when switched over to AC the light would come on but no fan.
Had the operator power down the crane and unplug the KP plug and plug it back in. Heater started working again.
In case needed:
Q131A Heater Circuit Breaker
Q340A & Q342A Wiper Circuit Breakers
Q362A AC Circuit Breaker