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RTH8500
25 69-2219EF—03
Troubleshooting
SETUP WIRING ASSISTANCE TROUBLESHOOTING
Heating or
cooling system
does not
respond
• Press SYSTEM to set system to Heat.
Make sure the temperature is set higher
than the Inside temperature.
• Press SYSTEM 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.
Red light is on • If thermostat is in Emergency
Heat mode the red light is normal.
It shows that the thermostat is in
emergency heat mode.
• If thermostat is not in Emergency
Heat mode, contact a qualified
service contractor for repair.
Heating
system is
running in cool
mode
• Check Function 0170: System
Type to make sure it is set to
match your heating and cooling
equipment (see page 16).
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