Boiler Repair

Expert diagnosis and repair of all boiler makes and models. Fast response times for emergency breakdowns to get your heating back on.

Price: From £99
Typical time: Same day
Guarantee: 12 months on workmanship

Call 07502 225764 Get a free quote

9.96/10 on Checkatrade from 103 reviewsGas Safe registered, trading since 2009

Our work: Boiler with its casing off for fault-finding

About boiler repair

Boiler repair covers diagnosing and fixing faults on the boiler you already have: no heating or hot water, an error code on the display, strange noises, a leak, or a boiler that keeps losing pressure. If the boiler is otherwise sound, a repair gets it working again without the cost or disruption of a full replacement.

Common faults include a failed PCB (the boiler's control board), a stuck diverter valve causing hot water but no heating or vice versa, ignition faults, a failing pump or fan, and a faulty gas valve. Noises like kettling or banging usually point to limescale or sludge building up in the heat exchanger and system water, rather than a failed part.

Losing pressure repeatedly is one of the most common call-outs. Boiler pressure normally sits around 1 to 1.5 bar when the system is cold, and a boiler that keeps dropping below that usually has a leak somewhere in the sealed system, a failing pressure relief valve, or a worn expansion vessel. This is a different problem from low pressure or weak flow at your taps and showers, which is about the mains water supply rather than the sealed heating circuit, covered under water pressure problems.

If you smell gas at any point, leave the property, don't operate any switches, and call the National Gas Emergency Service on 0800 111 999. For anything short of that, we diagnose the fault on the visit, explain what's wrong in plain terms, and fix it where the parts and access allow, working across Romford and the wider Havering area.

What's included

How the job runs, start to finish.

1Fault diagnosis using the manufacturer's error codes
2Testing components such as the PCB, diverter valve, and pump
3Repressurising the system via the filling loop where safe to do so
4Checking the sealed system for leaks
5Replacing faulty parts such as valves, sensors, or the expansion vessel
6Flue gas analysis to confirm safe combustion after the repair
7Straight advice on whether a repair or replacement makes more sense

Boiler Repair pricing

Price

From £99

Typical time: Same day

24/7 Emergency
Fixed Price
No Call-Out Fee
12-month workmanship guarantee

Every job is priced before any work starts, and quotes are free.

Call 07502 225764 Get a free quote

Signs you need boiler repair

No heating or no hot water
Boiler keeps losing pressure
Error code showing on the display
Banging, kettling, or gurgling noises
Pilot light or ignition keeps failing
Water leaking from the boiler casing or pipework
Radiators not heating up properly

What customers say

All 103 reviews

“Very quick turnaround very through and clean and tidy made sure my toilet worked before leaving and made sure I was happy 😃 Very lovely lads”
Plumbing & Heating · Checkatrade review, RM7
“Dan was highly competitive on price and his guys were excellent, friendly and respectful. The work was done within the time I was quoted which was great. Old equipment was removed with no mess at all. Now, the bottom line is ‘would I recommend Dan to my family and friends” - 100%. 👍”
Plumbing & Heating · Checkatrade review, RM1
“Excellent all round service from DJ’s Plumbing Services. From providing the quotation through to completing the work the company provided a very professional, proactive and high quality service. The approach adopted by the team was one of ensuring complete customer satisfaction. Very impressed, will definitely use them again.”
Plumbing & Heating · Checkatrade review, CM13

Boiler Repair questions

Clear answers to your most common plumbing concerns.

Do you repair all brands?

Yes, we repair Worcester, Vaillant, Baxi, Ideal, and all major brands.

Why does my boiler keep losing pressure?

The most common causes are a small leak somewhere in the sealed heating system, a failing pressure relief valve, or a worn expansion vessel that's lost its air charge. Topping up the pressure yourself treats the symptom, not the cause, so if it keeps happening it needs a proper leak check.

What does an error code on my boiler mean?

Each manufacturer uses its own set of fault codes, so the same number means different things on a Worcester Bosch compared with a Vaillant or Baxi. We diagnose against the specific manufacturer's code list rather than guessing, which is why it's worth noting the exact code before you call.

Is it safe to keep using my boiler with an error code showing?

It depends on the fault. Some codes are minor and the boiler will keep running; others, particularly anything related to the flue or gas valve, mean the boiler has locked out for safety and shouldn't be forced to restart repeatedly. If you're unsure, turn it off and get it checked rather than resetting it repeatedly.

Why has my boiler stopped producing hot water but the heating still works?

This usually points to a diverter valve that's stuck in the heating position, or occasionally a faulty sensor telling the boiler hot water isn't being called for. It's a common and generally straightforward fault to diagnose and fix on a combi boiler.

My boiler pressure gauge reads normally but I have weak pressure at the taps, what's wrong?

That means the fault isn't with the boiler at all. Boiler pressure is about the sealed heating circuit; weak flow at taps and showers is a mains water supply issue, which is a separate problem covered under water pressure problems rather than a boiler fault.

Where we work

Based in Romford, covering Havering, Essex and London.

Boiler Repair guides

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