Honeywell RTH5100B Installation Manual page 25

In case of difficulty
Heating or
cooling system
does not respond
"Cool On" or
"Heat On" is
flashing
• 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.

RTH5100B