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The most common boiler faults

By Matthew Knight

Which? reveals the most common problems with condensing gas and oil boilers, according to our boiler owners' survey.

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How much does it cost to fix your boiler?

In 2018 we asked 166 Which? Trusted Trader heating engineers how much they would charge for parts and labour to fix the 10 most common boiler faults. You can see the average cost of repair in the image, below.

Make sure you cross reference any quotes you get for fixing your boiler against the prices below and make sure you're not ripped off. 

If it's time for a new boiler, you need to choose one you can trust to keep your home cosy during winter. We reveal the best boiler brands.

We asked Which? members about the faults and annoyances they had experienced with their condensing gas and oil boilers they'd installed within the previous six years. 

A quarter of them had experienced some kind of fault with their gas or oil boiler since they had bought it. Luckily, not all faults needed a professional repair. However, the average cost of repairs is £182 each time.
The most common boiler faults
Fault Gas boilers Oil boilers
Boiler losing pressure 9% 8%
Water leaking from the boiler 5% 4%
Problem with the built in controls 5% 3%
The control panel displays an error code and can not be reset 4% 0%
Boiler switches itself off 4% 4%
Problem with non built in controls 4% 2%
Water leaking from the condensate pipe 3% 4%
Noisy boiler 4% 2%
Problem with the burner 2% 4%
Table notes
1 The most common faults are based on responses from a survey of 10,779 members of Which? Connect panel members about their boilers that took place in May 2015.

Fixing your boiler

Discover how to maintain your boiler and how to get access to parts and spares to keep your boiler in working order with our guide to boiler maintenance

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