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Symptom Cause
Thermostat does not call for cooling
Minimum-off times. Change the mode to OFF first, then change the mode
to COOL and make a call for cooling.
Cooling does not come on at all
RC terminal not connected – see wiring diagrams.
Cooling equipment power not on.
Heat comes on instead of cooling
O/B dip switch not set properly. See Step 2, page 32.
Miswiring – check wire colors at thermostat and HVAC equipment.
TROUBLESHOOTING – COOLING OPERATION
Configuration Settings
Single/Multi Single Multi
HP/HC
The same outputs come on
regardless of how these are set.
Elect/Gas
Aux. Ht. Stages
Outputs Energized
1st Stage Cool Y1, G Y1, G
2nd Stage Cool Y1, Y2, G
9. CHECK COOLING OPERATION
Notes:
• To avoid the minimum on and off times during system
checkout, always start and end the check out
procedure in the OFF mode.
• Do not operate air conditioning at low outdoor
temperatures. Refer to equipment manufacturer
recommendations for safe operating temperatures.
1. Set the thermostat to the OFF mode.
2. Set the thermostat to the COOL mode.
• With the O/B configuration setting in the O position (OFF),
the O/B terminal will be on in the Cool mode. In the
B position (ON), the O/B terminal will not be on in the
Cool mode.
3. Lower the temperature setting below the room temperature to
activate the desired stages of cooling. The mode display will
change from “COOL MODE” to “COOLING”, which will flash,
when the thermostat is calling for cooling. Fifteen (15) seconds
must elapse between each stage. Verify the correct outputs
are on according to the configuration settings shown below: