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Boiler breakdowns: repair or replace?

Common faults, what Ross checks, and when a new boiler makes more sense.

5 min readWritten by Ross, Gas Safe registered engineer, no. 963857Published 13 September 2026Reviewed 17 October 2026
Boiler opened for fault diagnosis by HOLMHEAT

When the heating or hot water stops, you speak to Ross, the Gas Safe registered engineer who will come out, find the fault and fix it. Gas and electric boilers, all the main makes.

24 hrPhone and WhatsApp
£5mPublic liability cover
963857Gas Safe registered

What happens when you get in touch

  1. 01

    WhatsApp Ross

    Tell Ross what has stopped working, with a photo of the boiler and any fault code. Emergency? Call.

  2. 02

    Personal reply

    Ross replies himself with the call-out quote and the earliest slot.

  3. 03

    Fault found

    Instruments, not guesswork: pressure, flue gas analysis, and flow and return temperatures.

  4. 04

    Fixed, often first visit

    Common parts are carried on the van. If one needs ordering, you get the cost first.

What helps Ross prepare

  • A photo of the boiler front, and of the model label if you can see one
  • The exact code or message on the display, if there is one
  • What still works: heating, hot water, both or neither
  • The pressure reading, if there's a gauge
  • When it happens and how often
  • A photo under the boiler if there's a leak or the pressure keeps dropping

Nothing to test or switch on: just what you've already noticed. The form asks for exactly these, or send them on WhatsApp.

Smell gas, or has a carbon monoxide alarm gone off?

Don't use the form. Leave the house and call the National Gas Emergency Service on 0800 111 999.

Common faults Ross repairs

No heating or hot water

Ignition, gas valve, fan and flue faults traced and repaired.

Losing pressure

Leaks, expansion vessels and pressure-relief valves found and fixed.

Lockouts that keep coming back

The cause fixed, not just the boiler reset.

Noises and kettling

Sludge, scale, pumps and air locks identified and sorted.

Controls and wiring

Thermostats, valves and wiring centres diagnosed properly.

Leaks and drips

Pipework, seals, heat exchangers and condensate traced to source.

Boiler opened for fault diagnosis
Combustion check during a repair visit

Repair or replace?

Most breakdowns are worth repairing. Ross will tell you honestly when one isn't. That's when a boiler is beyond economical repair: the repair would cost a large share of a new boiler, often a major part such as the heat exchanger on an older boiler, or the parts are no longer made.

Beyond economical repair?A new boiler comes with up to 10 years' cover.

Replace it with an eligible Vaillant or Glow-worm boiler, fitted with the manufacturer's filter, and you get up to 10 years' parts and labour guarantee. If a covered fault happens in that time, the manufacturer repairs it under the guarantee, as long as the boiler is serviced every year.

You get both options priced, the repair and a new boiler, so you can choose.

This guide is general information. Your appliance’s instructions take priority, and anything involving gas must be done by a Gas Safe registered engineer.

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