Why Does My Boiler Keep Turning On and Off?

Discover the common reasons why your boiler might be short-cycling and when it's time to call a plumbing expert for help.

What is Boiler Short-Cycling?

If your boiler keeps turning on and off before it reaches the desired temperature, it is experiencing a common issue known as short-cycling. This not only prevents your home from heating properly but also puts immense strain on your boiler's components, leading to higher energy bills and premature system failure.

Common Causes of Short-Cycling

• Thermostat Issues: A faulty or poorly placed thermostat can send incorrect signals to your boiler.
• Low Water Pressure: Boilers rely on a specific water pressure to operate safely. If it drops too low, the system will shut off to prevent damage.
• Trapped Air: Air in the system can prevent water from circulating properly, causing localized overheating and triggering safety shutoffs.
• Faulty Water Pump: If the pump isn't moving water through the system, the boiler will quickly overheat and turn off.

When to Call a Professional

While you can check your thermostat settings and water pressure gauge yourself, most boiler issues require a licensed professional. If bleeding your radiators or topping up the pressure doesn't solve the problem, it's time to call the experts at Instant Plumbing & Heating.