Boiler repair — London
Boiler breakdown in London?
Gas Safe registered engineers diagnose and repair boiler breakdowns across all 33 London boroughs. All brands, all fault types — same-day attendance for no heating and no hot water.
Before you call
Quick checks when your boiler breaks down
Check the fault code
Modern boilers display a fault code (F22, EA338, E9 etc.) when they lock out. Note this down — it helps the engineer bring the right parts.
Check boiler pressure
If the pressure gauge reads below 0.5 bar, the boiler will lock out. Repressurise to 1.0–1.5 bar using the filling loop.
Check your gas supply
Is your gas meter showing credit? Are other gas appliances (hob, gas fire) working? If no gas appliances work, call your gas supplier.
Try a reset
Press and hold the reset button for 3 seconds. If the boiler fires up and runs, the fault may have been transient. If it locks out again, call an engineer.
Common boiler faults
Boiler breakdown symptoms in London
| Symptom | Likely cause | Urgency |
|---|---|---|
| No heating or hot water | Boiler lockout — check fault code on display | High |
| Boiler keeps cutting out | Overheat, pressure fault, or thermostat issue | Medium |
| Banging or kettling noises | Limescale on heat exchanger — common in London hard water areas | Medium |
| Boiler leaking water | Failed seal, pump seal, or heat exchanger micro-leak | High |
| Low boiler pressure | System leak, failed expansion vessel, or PRV dripping | Medium |
| Pilot light keeps going out | Thermocouple failure or gas valve fault | High |
| Boiler not responding to thermostat | Wiring fault, thermostat battery, or zone valve | Medium |
| Hot water works but no heating | Zone valve, motorised valve, or pump fault | Medium |
All brands covered
We repair all London boiler brands
Common questions
Boiler breakdown London: frequently asked
What should I do if my boiler breaks down in London?
First, check the obvious: (1) Is the boiler showing a fault code? Note it down before calling an engineer. (2) Is the boiler pressure below 1 bar? Repressurise using the filling loop. (3) Is the gas supply on? Check other gas appliances. (4) Has the thermostat been accidentally turned down? If none of these resolve the issue, contact a Gas Safe engineer.
How quickly can a Gas Safe engineer attend a boiler breakdown in London?
We aim to attend boiler breakdowns in London same-day in most cases. Breakdowns during cold weather are treated as priority callouts. Contact us with your postcode and boiler fault code and we will confirm our nearest engineer and estimated attendance time.
Is it worth repairing a broken boiler in London or replacing it?
The general rule: if the repair costs more than 50% of a new boiler, replacement is usually better value. Boilers under 10 years old with a good service history are almost always worth repairing. Boilers over 15 years old, especially F-rated non-condensing models, often make more sense to replace — particularly given London gas prices. Our engineers will always advise you honestly on repair vs replace before proceeding.
As a landlord, how long can tenants be left without a working boiler in London?
Under Section 11 of the Landlord and Tenant Act 1985, landlords must repair heating installations without unreasonable delay. Best practice is within 24 hours for loss of heating and hot water. For vulnerable tenants, the elderly, or families with young children, urgency is higher. If same-day repair is not possible, provide electric heaters and alternative hot water as a temporary measure.