Boilers 7 min read12 January 2026
Most boiler breakdowns in and around Glasgow come down to a short list of repeatable faults. If you know what your boiler is telling you, you can describe it accurately on the phone, and a Gas Safe engineer can arrive with the right part first time. Here are the ten faults we deal with most often across Glasgow and the surrounding areas.
The most common boiler faults in Glasgow homes
Glasgow's housing stock ranges from West End tenements to 1970s estates and new-build flats along the Clyde. That mix means we see everything from sludged-up open-vent systems to modern combis tripping on low pressure.
- Low water pressure (F1, F22 or a flashing pressure icon)
- Failed diverter valve — heating works, hot water doesn't
- Frozen condensate pipe after a cold night
- Faulty pressure relief valve dripping outside
- Kettling caused by limescale or sludge in the heat exchanger
- Ignition lockout from a dirty or failed electrode
- Failed pump — radiators cold, boiler cycling
- Broken thermostat or wireless receiver losing pairing
- Blocked or corroded flue seals picked up on service
- Expansion vessel losing charge, so pressure swings when heating fires
Emergency boiler repair across Glasgow
No heating in a Scottish winter is not something to sit on, especially with young children or elderly relatives at home. We keep common spares on the van — pumps, PRVs, thermostats, diverter cartridges and ignition leads — so a good share of jobs are fixed on the first visit.
When a part has to be ordered, we make the boiler safe, give you a written price before ordering, and book a return slot rather than leaving you guessing.
Repair or replace? How we decide
A repair makes sense when the boiler is under about twelve years old, parts are still available, and the fault is a single component. Replacement starts to look sensible when repairs are stacking up, the heat exchanger is failing, or the appliance is obsolete and spares are discontinued.
We give you both numbers — the repair price and the replacement price — so the choice is yours, not ours.
What to do before we arrive
Check the fault code on the display and note it down. Confirm the gas supply is on and other gas appliances work. Check the thermostat has fresh batteries and is calling for heat. Look for a tripped RCD in the consumer unit. These four checks solve a surprising number of 'boiler broken' calls before an engineer is needed.
Need help with this?
We handle this work every week. See Heating & Boiler Services in Glasgow or browse all our services.
Frequently asked questions
How quickly can you attend a boiler breakdown in Glasgow?
For most of Glasgow and the surrounding areas we aim for same or next working day, with priority given to no-heat and no-hot-water calls.
How much does a boiler repair cost?
We quote a fixed price before any work starts. Simple fixes such as a thermostat or pressure top-up are at the low end; pumps, fans and diverter valves cost more because of the part price.
Do you repair all boiler makes?
Yes — Worcester Bosch, Vaillant, Ideal, Baxi, Viessmann, Glow-worm, Ariston, Potterton and more.
Related reading
Why Your Boiler Keeps Losing Pressure
Heating Works But No Hot Water: What's Wrong
What Happens During an Annual Boiler Service