If your boiler keeps turning off by itself, it's a sign that something isn't working properly.
This can leave your home without consistent heating or hot water, and the issue usually won't fix itself.
In this guide, we'll explain the most common reasons why boilers switch off, what you can safely check yourself, and when it's time to call a professional gas engineer.
Why Does a Boiler Turn Itself Off?
Modern boilers are designed to shut down automatically when they detect a problem.
This is a safety feature to prevent damage or unsafe operation.
Common Causes of a Boiler Turning Off
1. Low Boiler Pressure
Low pressure is one of the most common reasons for a boiler switching off.
If pressure drops too low, the system may stop working properly.
Signs include:
- Pressure gauge below normal
- Heating not working consistently
Most boilers should be around 1-1.5 bar.
2. Thermostat Issues
If the thermostat isn't working correctly, it may:
- Turn the boiler off too early
- Fail to signal the boiler properly
- Cause inconsistent heating
3. Blocked or Restricted Flow
If water isn't circulating properly, the boiler may overheat and shut down.
This can be caused by:
- Sludge build-up
- Blocked pipework
- System circulation issues
4. Pump Problems
The pump is responsible for moving hot water through the system.
If it isn't working properly:
- Heat won't circulate
- The boiler may shut down
5. Internal Faults
If the issue isn't something simple, it may be due to internal components such as:
- Sensors
- Valves
- Electrical parts
These require professional diagnosis.
Safe Checks You Can Try
There are a few simple checks you can carry out safely.
Check Boiler Pressure
Make sure the pressure is within the normal range.
If it's too low, repressurising may help. Check your manual first.
Check Thermostat Settings
Ensure:
- Heating is set correctly
- Temperature is high enough
- Timer is active
Reset the Boiler
Some boilers allow a simple reset.
This can sometimes clear minor faults.
Do not attempt to open or repair the boiler. Internal work should only be carried out by a qualified gas engineer.
When to Call a Gas Engineer
If the problem continues, it's best to get professional help.
You should call a gas engineer if:
- The boiler keeps turning off repeatedly
- Pressure continues to drop
- Heating is unreliable
- The system makes unusual noises
- Error codes are showing
These issues usually require proper diagnosis and repair.
Professional Boiler Repairs in Kent
At Adam Gas Plumbing and Heating Kent, we deal with all types of boiler and heating problems.
We provide:
- Boiler fault diagnosis
- Boiler repairs
- System checks and adjustments
- Safe and compliant gas work
We focus on identifying the issue and fixing it properly.
Local Gas Engineer Near You
We provide boiler and gas engineer services across:
If you're searching for a "gas engineer near me", we're ready to help.
Need Help With a Boiler That Keeps Turning Off?
If your boiler keeps switching off and the issue isn't resolved, it's best to get it checked before it gets worse.
Call +44 7716 026508 to book a visit or email info@adamoilngas.com.
We provide reliable boiler repair services across Kent.