Honeywell RTH8500 User Manual page 68

Troubleshooting
Heat pump
issues cool air
in heat mode,
or warm air in
cool mode
Button on
lower right of
screen is blank
Red light is on
69-2715EF—07
• Check Function 0190: Heat Pump Changeover Valve to make sure it is
properly configured for your system (see page 55).
• This button will remain blank unless the furnace filter change reminder is
activated (see page 43).
• 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.
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