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61 69-2718EF—03
If you have difficulty with your thermostat, please try the following suggestions.
Most problems can be corrected quickly and easily.
Display is
blank
• Check circuit breaker and reset if necessary.
• Make sure power switch at heating and cooling system is on.
• Make sure furnace door is closed securely.
• Make sure C wire is connected (see page 13).
Cannot change
system setting
to Cool
• Check Function 1: System Type to make sure it is set to match your heating
and cooling equipment (see page 50).
Fan does
not turn on
when heat is
required
• Check Function 3: Heating Fan Control to make sure it is set to match your
heating equipment (see page 51).
Cool On or Heat
On is flashing
on the screen
• Compressor protection feature is engaged. Wait 5 minutes for the system to
restart safely, without damage to the compressor.
Troubleshooting