Honeywell RTH8500 Thermostat User Manual


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69-2715EF—07 66
Troubleshooting
Heat pump
issues cool air
in heat mode,
or warm air in
cool mode
• CheckFunction 0190: Heat Pump Changeover Valve to make sure it is
properly configured for your system (see page 55).
Button on
lower right of
screen is blank
• Thisbuttonwillremainblankunlessthefurnacefilterchangereminderis
activated (see page 43).
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.
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