Expert Boiler Repairs in Finchley

The most urgent call we receive. Causes range from a stuck diverter valve (common on combi boilers over 5 years old) to motorised valve failure on system boilers. We carry common replacement parts to resolve most causes on the first visit.

Modern boilers communicate faults through diagnostic codes. Each manufacturer uses different systems — Vaillant's F-codes, Viessmann's F and A codes, Worcester's EA codes. Accurate interpretation requires brand-specific knowledge, not guesswork.

Intermittent shutdown typically points to a safety device tripping — low water pressure, overheating protection, or a blocked flue. The frustrating part is that it often works fine when you're watching it. We diagnose the underlying pattern, not just the symptom.

Kettling (a sound like a kettle boiling) indicates limescale buildup on the heat exchanger. Banging can signal trapped air or pump bearing wear. Humming often points to a vibrating pump or fan. None of these resolve themselves — early attention prevents expensive damage.

Needing to top up your system more than once every few months means water is leaving somewhere. The leak may be at a radiator valve, a soldered joint, or the boiler itself. We locate and repair the source rather than just topping up.

Cold spots, rooms that won't reach temperature, or radiators that are hot at the top and cold at the bottom. Causes include system sludge, air locks, balancing issues, or a pump that's lost performance. Often solvable without boiler replacement.