Troubleshooting - Honeywell PRO 4000 Series User Manual

Troubleshooting

If you have difficulty with your thermostat, please try the following suggestions.
Most problems can be corrected quickly and easily.
Display is
blank
Heating
or cooling
system does
not respond
temperature
settings do
not change
"Cool on" or
"Heat on" is
flashing
"Heat on" is
not displayed
"Cool on" is
not displayed
• Check circuit breaker and reset if necessary.
• Make sure power switch at heating & cooling system is
on.
• Make sure furnace door is closed securely.
• Make sure fresh AA alkaline batteries are correctly
installed (see page 5).
• Set system switch to Heat (see page 1). Make sure
the temperature is set higher than the Inside temperature.
• Set system switch to Cool (see page 1). Make sure
the temperature is set lower than the Inside temperature.
• Wait 5 minutes for the system to respond.
Make sure heating and cooling temperatures are set to
acceptable ranges:
• Heat: 40° to 90°F (4.5° to 32°C).
• Cool: 50° to 99°F (10° to 37°C).
• Compressor protection feature is engaged. Wait 5
minutes for the system to restart safely, without damage
to the compressor (see page page 5).
• Set the System switch to Heat, and set the
temperature level above the current room
temperature (see page 1).
• Set the System switch to Cool, and set the
temperature level below the current room
temperature (see page 1).
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