Built-In Compressor Protection - Honeywell PRO TH1100D Operating Manual

PRO 1000 Series
Built-in compressor protection (select models)
Your thermostat has a feature that helps prevent damage to the compressor of
your air conditioning or heat pump system. Because damage can occur if the
compressor is restarted too soon after shutdown, this feature forces the
compressor to wait 5 minutes before restarting. During the wait time, the message
Cool On or Heat On flashes on the screen. When the safe wait time has elapsed,
the message stops flashing and the compressor turns on.
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