Troubleshooting
Cooling system does not respond (“COOLING” appears on screen)
•Check for 24 VAC at the equipment on the secondary side of the transformer between power and common. If voltage is not present, check the cooling equipment to find the cause of the problem.
•Check for 24 VAC between the cooling terminal (Y) and the transformer common. If 24 VAC is present, the thermostat is functional. Check the cooling system to find the cause of the problem.
•Check for loose or broken wires between the thermostat and the cooling equipment.
Fan does not turn on in a call for heat
•Check System Setting #02 (Fan Control), to make sure the fan control is properly set to match the type of system (see page 11)..
Heat pump issues cool air in heat mode, or warm air in cool mode
•Check System Setting #12 (Reversing Valve), to make sure it is properly configured for your system (see page 11)..
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Heat/cool both on at same time
•Check SW1 (Equipment Type), to make sure it is set to match the installed heating/cooling equipment
(see page 12)..
•Check to make sure heating and cooling wires are not shorted together..
Heating equipment is running in cool mode
•Check SW1 (Equipment Type), to make sure it is set to match the installed heating/cooling equipment
(see page 12)..
“HEATING” is not displayed
•Change the System Mode to Heat, and set the temperature level above the current room temperature..
“COOLING” is not displayed
•Change the System Mode to Cool, and set the temperature level below the current room temperature..
61000652C 8400 Tstat Install.indd 26 | 10/13/09 11:09:03 AM |