Service manual

12A.4 Compressor #1 Checkout; Cooling Mode

Thermostat Calling For Cooling

Note: All operating functions subject to thermostat time delays

Important Notice:

If the unit is equipped with a high pressure switch and this switch opens, it

Opens the 12 VDC (-) negative circuit from the thermostat to the P.C. Board

and all heat pump functions are dead. Be sure to correct the root problem causing

the high head pressure. If any heat pump function operates, the switch is OK.