5
If you have difficulty with your thermostat, please try the following suggestions.
Most problems can be corrected quickly and easily.
Display is blank Make sure fresh AA alkaline batteries are properly installed (see
page 3).
Heating or cooling
system does not
respond
Press Menu and then Mode to set system to Heat. Make sure the
temperature is set higher than the Inside temperature.
Press Menu and then Mode to set system to Cool. Make sure the
temperature is set lower than the Inside temperature.
Check circuit breaker and reset if necessary.
Make sure power switch at heating & cooling system is on.
Make sure furnace door is closed securely.
Wait 5 minutes for the system to respond.
Heat On / Cool On
flashing on the screen
Compressor protection feature is engaged. Wait 5 minutes for
the system to restart safely, without damage to the compressor.
Troubleshooting
Electrical Ratings
Terminal Voltage (50 Hz/60 Hz) Running Current
W Heating 20 Vac - 30 Vac 0.02 A - 1.0 A
W2 (Aux) Heating (TH3210U only) 20 Vac - 30 Vac 0.02 A - 1.0 A
E Emergency Heat (TH3210U only) 20 Vac - 30 Vac 0.02 A - 0.5 A
Y Compressor Stage 1 20 Vac - 30 Vac 0.02 A - 1.0 A
G Fan 20 Vac - 30 Vac 0.02 A - 0.5 A
O/B Changeover 20 Vac - 30 Vac 0.02 A - 0.5 A
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