How to Recalibrate a Honeywell Thermostat

Honeywell thermostats are calibrated at the factory to provide the optimum temperature settings. However, there may be occasions when you need to recalibrate your Honeywell. In that case, you'll need a tool called a recalibration wrench. These are made to fit over the hex nuts inside the thermostat so you can make minute adjustments.

Recalibration wrench

Instructions

- 1
  Gently push on the temperature setting indicator until it shows the same reading as the thermometer on the thermostat.
- 2
  Remove the thermostat cover.
- 3
  Slip the calibration wrench under the heating coil and around the hex nut beneath the coil. The heating coil is the spiral-shaped strip of metal set to one side of the thermostat.
- 4
  Place a finger on the setting switch to prevent it from moving during adjustments. Turn the wrench clockwise slowly until the heating switch inside nudges away from the thermometer.
- 5
  Replace the cover. Move the setting indicator to a low temperature setting. Wait 10 minutes for the cooling system to come on and stabilize the temperature.
- 6
  Remove the thermostat cover. Insert the calibration wrench underneath the heating coil. Steady the setting lever with your finger.
- 7
  Turn the wrench slowly to the right until the mercury inside the tube inches just to the left side of the indicator bar on the tube. Replace the thermostat cover.

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