Troubleshooting
Heating or
cooling system
does not
respond
"Cool On" or
"Heat On" is
flashing
Heat pump
issues cool air
in heat mode,
or warm air in
cool mode
• Press SYSTEM button to set system
to Heat. Make sure the temperature
is set higher than the Inside
temperature.
• Press SYSTEM button 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.
• 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 15).
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RTH6400
69-2210EF—03