Why Your Boiler Won’t Turn On With the Thermostat

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Completed boiler repair

It’s inconvenient and stressful when your boiler’s not turning on with the thermostat. It’s possible it’s for a simple reason, like the thermostat needing new batteries, but some issues require a certified HVAC technician to repair the boiler or thermostat.

Pro Comfort Control is here to help when you need plumbing and heating services in Needham, MA. Keep reading to learn why your boiler and thermostat aren’t getting along.

The Boiler Is Off in Your Needham, MA, Home

When your boiler’s not turning on with the thermostat, start with the basics. It may feel silly to double-check that your boiler is on, but a power surge or a tripped circuit breaker can cause it to turn off.

If your boiler is still on, check that your thermostat is on, too. Thermostats may also turn off for similar reasons, or may need new batteries if it’s not tied into your home’s electrical system.

The Thermostat Needs Batteries or Is Too Old

Common thermostat issues are due to the thermostat needing new batteries or it’s time to replace the entire thermostat. If your thermostat runs on batteries, get into the practice of changing them once or twice a year based on its power usage so you don’t end up with sudden boiler issues.

Thermostats typically have a lifespan of 10 years before they die completely, new batteries or not. If you’ve had your system for about a decade and it’s been acting funny, it’s probably time to replace it. If you appreciate money-saving hacks, consider upgrading to a smart thermostat system for better control of your system and to keep better tabs on thermostat health.

The Thermostat Is in a Warm Location

For accurate readings, thermostats should be kept away from warm areas. It’s typically a bad practice to install them in kitchens, small rooms that stay warm, or near fireplaces and boilers.

The heat in these areas will tell the thermostat the house is warm, so it won’t communicate to the boiler to turn on. Boilers only turn on when the thermostat drops to the specified temperature. It likely won’t reach that temperature if it’s regularly heated by a nearby heat source.

You Misread the Directions

Sometimes, you might misread the directions for a new boiler or thermostat and misunderstand how to use the system correctly. Accidents happen — don’t sweat it! If the above solutions don’t solve your problem, reread the guides that came with these devices to ensure you’re not mixed up about how to use these functions:

  • Temperature settings on the thermostat or boiler
  • Control settings like “heat” and “cool” buttons, or automatic and timer settings
  • Smart thermostat connectivity, like pairing the thermostat with your boiler or smartphone

If you’re still unsure what you could be doing wrong after reviewing the guides, call your local HVAC technician. They’ll inspect everything to see why your boiler won’t turn on with the thermostat. It’s possible you’re doing everything correctly but something in the boiler is damaged or malfunctioning.

Something Activated the Safety Lockout

Modern boilers come equipped with safety locks to prevent dangerous situations. If your boiler won’t turn on, it could be because something went wrong and activated the safety lock, so it won’t come on until you investigate the issue.

Problems that could lock your system include:

  • Pilot light problems: If the pilot light fails to ignite, the boiler may lock to prevent gas leaks or other complications.
  • Pressure problems: Your boiler may have a safety lock for low or high pressure. Low pressure will prevent the system from functioning correctly, while high pressure raises the risk of an explosion.
  • Heating system failure: Many boilers activate a safety lock where there is some kind of heating system failure.
  • Other boiler malfunctions: Issues with electrical connections, loose pieces, or other issues may be why your boiler won’t turn on with the thermostat.

If a safety lock turns on, contact a certified HVAC technician right away. Many of these problems are serious and should be handled promptly to avoid issues that could cause costly repairs.

Call Pro Comfort Control in Needham, MA, When Your Boiler Won’t Turn On

If your boiler’s not turning on with the thermostat and simple troubleshooting at home won’t resolve the problem, you need a heating and AC installation contractor. Call Pro Comfort Control in Needham, MA, for fast repairs that will get you comfortable in your home again. Boilers can be dangerous when they’re not kept in prime condition, so don’t put off calling us.

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