Honeywell 1-Heat/1-Cool - TH5110D1022 Large R

Questions and Answers

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nguyenmatthewJul 29, 2025
Why is my Honeywell 1-Heat/1-Cool - TH5110D1022 Large R display blank?
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  deborah08Jul 29, 2025
  If your Honeywell Thermostat display is blank, there might be a few reasons. First, check the circuit breaker to ensure it hasn't tripped. Also, verify that the power switch for your heating or cooling system is turned on. Make sure the furnace door is securely closed. If your thermostat uses batteries, ensure that fresh AAA alkaline batteries are correctly installed.
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kpetersonAug 2, 2025
What to do if my Honeywell 1-Heat/1-Cool - TH5110D1022 Large R Thermostat heating system does not turn on?
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  Lisa TranAug 2, 2025
  If your heating system isn't turning on, first, make sure the system is set to Heat by pressing the System button. Check that the heat temperature setting is higher than the room temperature and that “Heat On” is steadily displayed. Also, check the circuit breaker and the power switch for the heating/cooling system. Ensure the furnace door is closed securely. Wait five minutes to see if the heating system responds.
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Sarah WilliamsonAug 6, 2025
What to do if my Honeywell 1-Heat/1-Cool - TH5110D1022 Large R cooling system does not turn on?
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  Tyler SnyderAug 6, 2025
  If the cooling system isn't activating, set the system to Cool using the System button. Verify that the cool temperature setting is below the room temperature and that “Cool On” is steadily displayed. Check the circuit breaker and the power switch for the heating/cooling system. Ensure the furnace door is securely closed. Allow five minutes for the cooling system to respond.
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xdanielsAug 11, 2025
Why is “Heat On” flashing on my Honeywell 1-Heat/1-Cool - TH5110D1022 Large R Thermostat display?
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  Jacqueline MillerAug 11, 2025
  If “Heat On” is flashing on your Honeywell Thermostat display (for heat pump systems only), the compressor minimum-off timer is active. Please wait up to five minutes for the heating system to turn on.
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Michael ColemanAug 15, 2025
Why is “Cool On” flashing on my Honeywell Thermostat display?
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  Allen Garcia MDAug 15, 2025
  If “Cool On” is flashing on the display, the compressor minimum-off timer is active. Allow up to five minutes for the cooling system to activate.
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wvillaAug 19, 2025
Why “Heat On” is not showing on my Honeywell 1-Heat/1-Cool - TH5110D1022 Large R?
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  Gregory HuntAug 20, 2025
  If “Heat On” isn't showing on your Honeywell Thermostat, set the System setting to Heat and ensure the temperature setting is above the current room temperature.
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Kenneth GibsonAug 25, 2025
Why “Cool On” is not showing on my Honeywell Thermostat?
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  smithelizabethAug 25, 2025
  If “Cool On” isn't displayed on your Honeywell Thermostat, make sure the System setting is set to Cool and the temperature setting is below the room temperature.