Honeywell RTH5100B - Heating or cooling system does not respond; Cool On or Heat On is flashing

Operating Manual
69-2330EFS—01 14
About your new thermostatIn case of difficulty
Heating
or cooling
system does
not respond
• 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.
“Cool On” or
“Heat On” is
flashing
• Compressor protection feature is engaged. Wait 5 minutes
for the system to restart safely, without damage to the
compressor.
Other problems • If the above measures do not resolve the problem,
check the In Case of Difficulty section in your thermostat
Installation Guide.