How to Reset Honeywell Thermostat Old Model in a Few Simple Steps

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Honeywell is a brand that have produced thermostat for decades used by homes and business. While modern digital programmable thermostats are more common these days, some buildings still use the traditional mercury thermostat. If you are one of the owners of this specific device type, you may look for how to reset Honeywell thermostat old model. Find out the complete guide below.

A Guide to Reset Older Honeywell Thermostat Models

Older, mechanical thermostats tend to be used for heating systems in old housing, but some residential apartments also employ them. They consist of different varieties that help controlling the indoor climate system that includes air conditioning, water heaters, underfloor heating, and others to achieve convenient and comfortable living spaces.

While there are different brands and manufacturers of mechanical thermostat, one of the most widely known one is Honeywell. Similar to other manufacturers, Honeywell older, mechanical thermostat model involves temperature-controlling switch using a sealed mercury drop placed in a tiny small glass tube.

Without getting into a detailed process of how a mercury thermostat operating, it basically has a switch to select between a cooling or heating operation, that must be manually moved at the start of the changing session. It is important for a mercury thermostat to be mounted level and vertically for it to work properly. Usually, it includes a marked mounting base to make sure that the thermostat is aligned on a level line.

how to reset Honeywell thermostat old model

It is easy to identify mechanical thermostat as they require manual operation, instead of programmable one like you’d find with more modern thermostat. Another big difference is mechanical thermostats do not use battery to run, which is a component that you usually have to deal with when it comes to resetting a thermostat.

So, how to reset Honeywell thermostat old model with manual set? Follow the steps below:

  1. Start the process of thermostat reset by shutting down the device first. In general, you can simply switch it to the ‘OFF’ position.
  2. Turn off the circuit breaker that supplies electrical power to the HVAC system of your house as well. Locate the breaker and then set it to ‘OFF’ position.
  3. Wait around half to a full minute before turning the device back on.
  4. Switch the circuit breaker to ‘ON’ position.
  5. Set the thermostat back to ‘ON’ position.
  6. You have completed the reset process. Check if the thermostat is properly working.

Honeywell thermostat reset on mechanical model can also come in digital operation system. In this case, it should have batteries, which you need to remove for about five seconds to reset. Another alternative is to use a reset button, if it’s available, by pressing it for about five seconds. The normal operation should be carried on afterwards.

A reset process can help with some issues, which you may solve by following the guide on how to reset Honeywell thermostat old model. However, more major problems may not be able to resolve simply by resetting the device. In this case, you may need to contact a professional repairman or even replace the thermostat to a new one.