Honeywell RTH8500 Wi-Fi Series Thermostat User Guide
Troubleshooting
If you have difficulty with your thermostat, please try the following suggestions.
Most problems can be corrected quickly and easily.
Display is
blank
• Check circuit breaker and reset if necessary.
• Make sure power switch at heating and cooling system is on.
• Make sure furnace door is closed securely.
• Make sure C wire is connected (see page 6).
Cannot change • Check Function 0170: System Type to make sure it is set to match your
heating and cooling equipment (see page 22).
system setting
to Cool
Fan does
• Check Function 0180: Heating Fan Control to make sure it is set to match
your heating equipment (see page 22).
not turn on
when heat is
required
“Wait” appears • Compressor protection feature is engaged. Wait 5 minutes for the system to
restart safely, without damage to the compressor.
on the screen
Heat pump
• Check Function 0190: Heat Pump Changeover Valve to make sure it is
properly configured for your system (see page 22).
issues cool air
in heat mode,
or warm air in
cool mode
Button on
lower right of
screen is blank
• This button will remain blank unless the furnace filter change reminder is
activated (see page 17).
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 or
cooling system
does not
• 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.
respond
• 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
19).
Heating system • Check Function 0170: System Type to make sure it is set to match your
heating and cooling equipment (see page 22).
is running in
cool mode
33-00133EF—01
26
| General | Details |
|---|---|
| Name | Honeywell RTH8500 Wi-Fi Series Thermostat User Guide |
| Make | Honeywell |
| Language | English |
| Filetype | PDF (Download) |
| File size | 1.23 MB |
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