Why Won’t My Heater Turn Off?

Why Won’t My Heater Turn Off?

In the Valley of the Sun, we typically only use our heaters sparingly during Arizona’s brief winter. There is rarely a need to constantly have the heater on, but sometimes the heater just won’t turn off.

Before calling the friendly HVAC experts at Howard Air, here are a few tricks you can use to solve some of the most common issues we see every season for heaters not turning off.

How to Turn Off Heat

Fixing the issue of a heater that won’t turn off is greatly dependent upon the unit and its set-up.

See if any of these methods can resolve the issue you’re experiencing.

  • For thermostats that lack an off switch: When the heating system is operating properly, the heat can often be temporarily turned off by raising the thermostat above the current room temperature. However, if the thermostat is properly adjusted and the heat still won’t turn off, there are other mechanical issues that will likely require professional attention.
  • Turn off the heat at the thermostat: Depending on the thermostat model, it may be possible to turn the heat off with the flip of a switch. Many thermostats have a “Cool/Heat Off” switch or button.
  • Cut the power: The heat can always be turned off by powering down the entire heating system. Many systems have an on/off switch near the boiler or furnace or in another location around the house for easier access. Quite often, these switches are colored red and clearly labeled.

What Causes The Heat To Stay On?

When a heater turns on but not off, there could be several different causes. Some possible reasons why it may not be turning off include:

  • A bad thermostat. The thermostat itself can be the issue. A defective unit can have poor wiring, non-responsive switches, or in some cases a bad heating sensor. Depending on the issue and its severity, the thermostat may be repairable. In severe cases, it may need to be replaced entirely.
  • A damaged primary controller on the heating unit. In cases where the thermostat is not the issue, it is likely the main heating unit has some kind of damage. In such cases, a damaged primary controller is often the cause. Other mechanical issues can also cause the heater to remain turned on.
  • A defective check valve. For radiators and other heating systems that rely on hot water, a bad check valve can cause the heater to stay on. Without a working check valve, water circulates on its own to keep the heating system turned on. Having a professional replace the valve or water-checking system alleviates this issue.


Howard Air

Power down the unit and give us a call. A complex scenario like a broken sensor or defective water valve requires expert knowledge and skills to properly repair.

Contact Howard Air today to resolve your heating issues. We have been assisting homeowners and businesses with their heating and cooling needs in the greater Phoenix area for generations.

This post appeared first on Howardair.com

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