Honeywell RTH9580 Wi-Fi, User Manual, Page: 74 / 160

72
Troubleshooting
Heat pump
issues cool air
in heat mode,
or warm air in
cool mode
• Check your setting for System Setup screen “Type of changeover valve” to
make sure it is properly configured for your system (see page 66).
Heating or
cooling system
does not
respond
• Touch
SYSTEM
to set system to Heat. Make sure the temperature is set
higher than the Inside temperature.
• Touch
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 and cooling system is on.
• Make sure furnace door is closed securely.
• If “Wait” is displayed, the compressor protection timer is on. Wait 5 minutes
for the system to restart safely, without damaging the compressor (see
page 59).
Heating system
is running in
cool mode
• Check that System Setup screen “Your thermostat controls” or “Your
system type” is set to match your heating and cooling equipment (see
“System Setup Options (MENU > System Setup)” on page 65).