Honeywell RTH6500 User Manual page 24

Troubleshooting
If you have difficulty with your thermostat, please try the following suggestions.
Most problems can be corrected quickly and easily.
Display is
blank
Cannot change
system setting
to Cool
Fan does
not turn on
when heat is
required
Cool On or Heat
On is flashing
on the screen
Heat pump
issues cool air
in heat mode,
or warm air in
cool mode
Heating or
cooling system
does not
respond
Heating system
is running in
cool mode
Heating
and cooling
equipment are
running at the
same time
69-2715EF—07
• 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).
• Check Function 1: System Type to make sure it is set to match your heating
and cooling equipment (see page 18).
• Check Function 3: Heating Fan Control to make sure it is set to match your
heating equipment (see page 18).
• Compressor protection feature is engaged. Wait 5 minutes for the system to
restart safely, without damage to the compressor.
• Check Function 2: Heat Pump Changeover Valve to make sure it is properly
configured for your system (see page 18).
System
• Press to set system to Heat. Make sure the temperature is set higher
than the Inside temperature.
System
• Press 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.
• Check Function 1: System Type to make sure it is set to match your heating
and cooling equipment (see page 18).
• Check Function 1: System Type to make sure it is set to match your heating
and cooling equipment (see page 18).
• Grasp and pull thermostat away from wallplate. Check to make sure bare
wires are not touching each other.
• Check thermostat wiring is correct.
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