Honeywell RTH8500 Thermostat User Manual


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67 69-2715EF—07
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.
• If“Wait”isdisplayed,thecompressorprotectiontimerison.Wait5minutes
for the system to restart safely, without damaging the compressor (see page
48).
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 54).
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