Honeywell RTH9580 - Troubleshooting Common Issues

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If you have difficulty with your thermostat, please try the following suggestions. Most
problems can be corrected quickly and easily.
Display is
blank
• 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.
• Make sure C wire is connected (see page 5).
Cannot change
system setting
to Cool
• Check that System Setup screen “Your thermostat controls” or “Your
system type” is set to match your heating and cooling equipment (see
page 29).
Fan does
not turn on
when heat is
required
• Check that System Setup screen “Your fan control” is set to match your
heating equipment (see page 28).
“Wait” appears
on the screen
• Compressor protection feature is engaged. Wait 5 minutes for the system
to restart safely, without damage to the compressor.
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 congured for your system (see page 28).
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 26).
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 29).
Troubleshooting
Regulatory information
EN 300 328 V1.9.1 (2015-02)
This equipment has been tested and found to comply with EN 300 328 V1.9.1 (2015-02).
Electromagnetic compatibility and Radio spectrum Matters (ERM); Wideband transmission systems; Data transmission equipment
operating in the 2,4 GHz ISM band and using wide band modulation techniques; Harmonized EN covering the essential
requirements of article 3.2 of the R&TTE Directive