Honeywell RTH6300B Operating Manual page 19

In case of difficulty
Heating or cooling
system does not
respond
"Cool On" or
"Heat On" is
flashing
Other problems
• 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
(see page 14).
• If the above measures do not resolve the problem, check the In Case of
Difficulty section in your thermostat Installation Guide .
RTH6300B Programmable Thermostat
17 69-1925EF—03