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Problem Guides

Boiler Maintenance

Boiler servicing, pressure, bleeding and general upkeep

10 free DIY guides · 18 total

Regular boiler maintenance is the single most effective thing you can do to extend the life of your heating system and avoid expensive mid-winter breakdowns. In the UK, an annual boiler service costs around £80–£120 and must be carried out by a Gas Safe registered engineer — it is a legal requirement for rented properties. These guides cover everything from topping up boiler pressure and bleeding radiators yourself, to understanding your service record, identifying when a repair has become uneconomical, and what to expect from a full Gas Safe service inspection.

Most popular
1

Hive Thermostat Not Working

Hive thermostat showing offline, not controlling heating, or not responding

2

How much does a boiler repair cost in the UK?

Typical UK costs for common boiler repairs — diverter valves, PCBs, pumps, and when it is cheaper to replace rather than repair.

3

Magnetic Filter — What It Does and How to Clean It

A magnetic filter protects your boiler from sludge damage. It should be cleaned annually, ideally at the boiler service.

All guides
Boiler Makes a Banging Noise When It Starts
Loud bang, thud or clunk when the boiler fires up or ignites· 1–3 hrs (engineer)
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Boiler Not Working in Cold Weather — Frozen Condensate PipeFree
In freezing temperatures, the condensate pipe is the most common reason a combi boiler stops working.· 15 min
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Boiler Short Cycling — Keeps Turning On and Off
Boiler fires up briefly then shuts off repeatedly without reaching temperature· 30 min–2 hrs
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Boiler not firing up in cold weatherFree
Frozen condensate pipe and cold weather ignition faults· 15–45 min
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Central heating inhibitor — what it is and how to add itFree
Protecting your system with corrosion inhibitor and magnetic filters· 15–30 min
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Hive Thermostat Not WorkingFree
Hive thermostat showing offline, not controlling heating, or not responding· 15–45 min
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How much does a boiler repair cost in the UK?
Typical UK costs for common boiler repairs — diverter valves, PCBs, pumps, and when it is cheaper to replace rather than repair.· 1–4 hours
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How much does a new boiler cost in the UK?
Realistic UK prices for combi, system and heat-only boiler replacement in 2025 — what to expect and how to avoid being overcharged.· 1 day
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How much does a power flush cost in the UK?
UK prices for heating system power flushing, what is included, and whether you actually need one.· Half to full day
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How to Repressurise a Combi BoilerFree
Low boiler pressure is one of the most common boiler problems and is usually a quick DIY fix.· 10 min
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How to bleed a radiator — step by stepFree
Removing trapped air from radiators to restore full heat· 10–20 min
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How to get more efficiency from your combi boilerFree
Reduce gas bills and improve heating performance without replacing the boiler· 1–2 hrs
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Magnetic Filter — What It Does and How to Clean It
A magnetic filter protects your boiler from sludge damage. It should be cleaned annually, ideally at the boiler service.· 30 min
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Nest Thermostat Not WorkingFree
Nest Learning Thermostat offline, blank screen, or not controlling the boiler· 15–45 min
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Power flushing — do you actually need it?
Find out if power flushing is necessary before spending £400–£800· 6–8 hrs (engineer)
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Powerflush — do you actually need one?
When a powerflush is genuinely needed versus when it is a waste of money· Half to full day
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Tado Thermostat Not WorkingFree
Tado smart thermostat offline, not responding, or showing connection errors· 15–30 min
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What happens during a boiler annual service?Free
Understand exactly what the engineer checks so you know if the job was done properly· 45–90 min
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