Honeywell manufactures a number of digital thermostats, each with its own features and its own collection of things that might go wrong. Thermostats tend to operate on very basic principles, however, and Honeywell designs its products with long-term use in mind. When a digital thermostat doesn't work, it pays to run through a few basic troubleshooting steps before calling a repairman or replacing the unit. Troubleshooting doesn't take more than a few minutes, and could save you a great deal of time and money in return.
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Things you need
- Honeywell digital thermostat
Check the power to the thermostat. A tripped breaker switch may cut off electricity to that part of the house; and if it's not a part you use very often, you may not realise it has been tripped. In addition, you simply may have inadvertently turned the digital thermostat off while adjusting the controls. It sounds obvious, but it can happen.
Examine the latch connecting the thermostat with its wall plate. Honeywell designs its digital thermostats to snap into position, and if yours isn't firmly attached, the display may not come on.
Open the thermostat and check the wiring. Honeywell thermostats use a number of different wires leading to different parts of the house's heating and cooling systems. Those wires need to be installed in the proper terminal--each marked with a letter that matches the same terminal in your older thermostat. If the wires were placed in a different terminal, the thermostat won't work properly.
Give the thermostat time to work. In some cases, it may not kick in immediately when you set the controls. It takes a few minutes for the proper components to warm up or cool down. Wait at least five minutes before determining that something is wrong.
Make sure the programmable thermostat is set to "Heat" or "Cool." The A/C or heating functions won't work just by adjusting the temperature gauge; you have to specify which function you want and then raise or lower the temperature gauge accordingly.
Check the specific temperature you'd like to achieve. Honeywell thermostats often have a set temperature range--between 4.44 and 37.2 degrees C, for example--which governs the temperature you can set. If you try to move the temperature gauge past those numbers, it simply won't work.
Troubleshooting: Digital Thermostat
Tips and warnings
- If troubleshooting doesn't work, contact Honeywell directly before speaking to a repair person. Your programmable thermostat may still be under warranty, in which case you can get a replacement for free.