Boiler Repairs We've Carried Out in Sevenoaks
We recently attended a boiler breakdown in Sevenoaks where the homeowner had suddenly lost all hot water while heating continued to work. The fault was a blocked plate heat exchanger — a common issue on older combi boilers where limescale and debris gradually restrict flow through the secondary heat exchanger until hot water output drops to nothing. We cleaned and flushed the heat exchanger on site, restoring full hot water pressure within the hour.
A blocked plate heat exchanger is one of the most common combi boiler faults we see across Sevenoaks and TN13/TN14 — particularly in properties that have never had a scale reducer or inhibitor fitted. The fix is often straightforward, but left unchecked it can cause the heat exchanger to fail completely, turning a £150–£200 repair into a £400+ part replacement. If your combi is producing heating but no hot water, this is the most likely culprit. We carry common parts on the van and can usually resolve the fault on a single visit.
Common Boiler Faults We Fix in Sevenoaks
Most boiler faults can be diagnosed and fixed on a single visit.
No Hot Water
Usually a diverter valve or blocked plate heat exchanger. We carry parts for all major brands and can fix most cases same-day.
No Central Heating
Stuck diverter valve, faulty pump, or thermostat/control issue. We diagnose the exact fault before recommending any repair.
Boiler Losing Pressure
System leak, faulty PRV or waterlogged expansion vessel. We find the root cause rather than just topping up and leaving.
Boiler Locking Out
Ignition failure, frozen condensate pipe, or error code fault. We find the root cause and fix it properly, not just reset it.
Boiler Making Noise
Kettling, banging or gurgling usually indicates limescale build-up, sludge or a failing pump. We diagnose and advise on the best fix.
Pilot Light Issues
A pilot light that won't stay lit usually points to a faulty thermocouple or gas valve. Repairable on the same visit in most cases.
Repair or Replace?
We'll always give you an honest answer at the visit.
As a rough guide: if your boiler is under 8 years old, a repair almost always makes sense. If it's over 12–15 years old with recurring faults, a new boiler is usually better value long-term — lower bills, manufacturer warranty and no more repair callouts. We'll quote for both options so you can make an informed decision.
New boiler installations from £1,800 fully fitted. Repairs quoted before we start — no hidden extras.