RTH7400/RTH7500
27 69-2104ES—01
In case of difficulty
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.
• Wait 5 minutes for the system to respond.
“Wait” appears
on the screen
• Compressor protection feature is engaged. Wait 5 minutes for the system
to restart safely, without damage to the compressor.
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 20).