All installations and services must be performed by qualified service personnel.

2.Is the sub-base of the thermostat switched to the “COOL” position?

3.Is the temperature setting on the thermostat low enough to bring the cooling system on?

4.Has the unit stopped cooling, making it necessary to wait several hours before the unit will restart? The fan motor, or compressor, may have shutdown on thermal-overload due to overheating. If this event frequently occurs, call your qualified heating contractor.

5.Has it been longer than four minutes since the last cooling cycle finished or since power was restored form an outage.

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Thermo Products OPB (24, 36)- 80, 30 service manual Is the sub-baseof the thermostat switched to the “COOL” position?