Boiler Repair

The most common causes we find are a faulty PCB (the boiler's control board), a failed gas valve, or worn spark electrodes that stop ignition from working. On a call-out we diagnose the fault first, then talk you through the repair and cost before doing any work — no surprise bills.

Repeated pressure loss is usually down to a failed expansion vessel or a worn pressure relief valve (PRV). We recharge or replace the vessel, fit a new PRV where needed, and repressurise the system so it holds steady rather than dropping again within days.

Yes, this is a common one. A power cut can trip the boiler's electronics or knock out a component like a fan or PCB that was already close to failing. We diagnose, source the part, and get heating and hot water back on the same visit wherever possible.

Very often, yes. Most systems use a motorised valve — either a 2-port zone valve or a 3-port valve — to direct hot water from the boiler to either your radiators or your hot water cylinder, depending on what's calling for heat. If that valve's motor or internal mechanism fails, it can get stuck sending water to only one side, leaving you with heating but no hot water, or hot water but cold radiators. We test the valve's motor and internal switching, and in most cases a straightforward valve replacement resolves it completely.

This usually points to a specific component rather than the whole boiler — commonly a diverter valve, flow sensor, or in system boilers, the cylinder's own controls. We isolate exactly which part is at fault before quoting, so you're not paying to replace things that don't need it.

Yes. Once we've diagnosed the fault, we give you a fixed price for the repair before doing any further work — not an estimate that changes once the job's underway. If we find something unexpected once we're inside the system, we'll always explain it and get your agreement before proceeding.