Top 5 reasons boilers break down in winter & how to prevent them
Keep your boiler running this winter
Winter is when your boiler works its hardest - and unfortunately, it's also the time it's most likely to break down. When the temperature drops, even small issues can quickly turn into major problems, leaving you without heating or hot water when you need them most.
At Go Assist, we help homeowners across the UK keep their boilers running smoothly, safely, and efficiently all year round. Here are the five most common reasons boilers break down in winter, and how to stop them before they cause trouble.
1. Frozen condensate pipe
In freezing temperatures, the condensate pipe - responsible for expelling excess water from your boiler - can freeze and become blocked. When this happens, your boiler may shut down as a safety precaution.
How to prevent it: Insulating the condensate pipe or ensuring it has been properly installed with the correct slope can help prevent freezing. If it does freeze, safely thawing it with warm water could solve the issue, but calling a professional is the safest option.
2. Low Boiler pressure
Boiler pressure can drop for a variety of reasons, such as leaks in the system, bleeding radiators, or general wear and tear. When the pressure is too low, your boiler won’t function efficiently, and it may even shut down.
How to prevent it: Regularly check your boiler’s pressure gauge. If it’s below the recommended level (typically 1-1.5 bars), it may need repressurising. Always refer to the manufacturer’s instructions or contact an engineer to safely increase the pressure.
3. Thermostat issues
Thermostats can become inaccurate over time or malfunction, causing your boiler to either overheat or not heat at all. This can be especially common in older models.
How to prevent it: Consider upgrading to a smart thermostat, which allows for better temperature regulation and energy efficiency. For existing thermostats, regular calibration and battery checks can help avoid breakdowns.
4. Faulty circulating pump
The circulating pump ensures hot water flows from the boiler to your radiators and taps. In winter, these pumps work harder and may become worn out or blocked, leading to uneven heating or no heat at all.
How to prevent it: Have your boiler serviced regularly to ensure the pump is in good condition. A well-maintained pump will perform better and last longer, reducing the chances of a winter breakdown. Call us on 0333 733 1234 to book your boiler service in today!
5. Pilot light problems
For older boilers, the pilot light can be prone to going out, especially in cold conditions.
How to prevent it: If your pilot light goes out frequently, it could indicate a larger issue. It’s best to have a professional inspect and repair it to avoid further problems.
Stay warm this winter
A boiler breakdown in the middle of winter is the last thing anyone needs - but with regular maintenance and a few simple checks, most issues can be avoided.
At Go Assist, we provide fast, affordable boiler repairs and servicing across the UK. Whether it's a sudden fault or a routine check-up, our experienced engineers are ready to help - with same and next-day appointments available.
