Honeywell TH4110D1007 Owner's Manual

Honeywell TH4110D1007 Owner's Manual

Troubleshooting Honeywell Pro 4000 Series

If you have difficulty with your thermostat, please try the following suggestions. Most problems can be corrected quickly and easily.

Honeywell TH4110D1007 Display is blank

  • 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).

Honeywell TH4110D1007 Heatingor cooling system does not respond

  • 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.

Honeywell TH4110D1007 Temperature settings do not change

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).

“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 (see page page 5).

Honeywell TH4110D1007 “Heat On” is not displayed

  • Set the System switch to Heat, and set the temperature level above the current room temperature (see page 1).

“Cool On” is not displayed

  • Set the System switch to Cool, and set the temperature level below the current room temperature (see page 1).

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Honeywell TH4110D1007 Owner's Manual