A boiler that keeps locking out is telling you something. We diagnose the underlying cause — not just reset the code — so the same fault doesn't put you back in a cold house next week.
Gas Safe registered · Open 24/7 · Emergency response typically within 1–2 hours · Estimate before any repair work
Yes
Local to Coventry CV2
Before any work
Written quotes
7 days/week
Open 24/7
Always
Customer service first
Breakdown diagnosis and repair on combi, system and conventional gas boilers: no ignition, lock-out fault codes, low pressure and repeated pressure loss, no hot water but heating works (or the reverse), kettling and banging noises, leaking from the boiler case, frozen condensate, failed diverter valves, pumps, PCBs, fans, expansion vessels, pressure relief valves, thermistors and flow sensors.
Homeowners across Coventry and CV2 with a boiler that's stopped, landlords who need a tenant back in heat quickly and a record of the work, and letting agents who want one reliable number rather than a rota of contractors.
Call straight away if you smell gas (and call 0800 111 999 first), if a carbon monoxide alarm has sounded, if the boiler is leaking water onto electrics, or if there's no heating in cold weather with vulnerable occupants in the property. Sooner is cheaper for pressure loss and kettling too — both get worse and both damage other components.
We'll tell you honestly. If the part is available, the boiler is under about 12 years old and the repair is a sensible fraction of a replacement, repairing is usually the right call. If it's an obsolete PCB on a fifteen-year-old unit that has already failed twice this winter, we'll say so rather than sell you a repair that buys three months.
Boiler faults rarely stay single faults. One failing component drags others with it, and the repair bill grows with every reset.
Topping up the filling loop every week isn't a fix. Water is going somewhere — a pipe joint, a radiator, the pressure relief valve or a failing expansion vessel — and the constant fresh water introduces oxygen that corrodes the system from inside.
Banging and rumbling means scale or sludge is causing localised boiling inside the heat exchanger. Left alone, it turns a cleanse into a heat exchanger replacement.
Lock-outs are protection, not an inconvenience. Repeatedly resetting a boiler that keeps failing on flame or overheat is exactly the pattern that ends with a dangerous appliance.
An unheated house in a Coventry winter risks frozen and burst pipework, which costs far more than the original repair.
A few questions and the fault code often tell us whether it's an emergency, whether you can safely restore heat yourself, and what parts to bring.
Fault history read, gas pressure and combustion checked, components tested electrically — we find the cause before we quote a part.
You get the cost of parts and labour, plus an honest view on whether repair or replacement makes better sense.
Parts fitted, system re-pressurised and purged, gas rate and combustion re-checked, and the boiler run through a full cycle before we leave.
We tell you what caused it — filter, inhibitor, cleanse or a service interval — so it doesn't happen again.
Open 24/7, with emergency attendance in Coventry typically within one to two hours.
Fault history and live testing rather than parts-swapping guesswork.
You approve the cost before we fit anything.
Combi, system and conventional gas boilers across the common UK brands.
Written record of the fault and the work carried out for your property file.
Our repair work is guaranteed in writing.
Most boiler call-outs across Coventry fall into a handful of repeatable patterns. Knowing them is what turns a two-hour diagnosis into a twenty-minute one.
Discuss your projectUsually electrical supply, a lock-out, a failed pump, an airlocked system or a seized diverter. We check power and fault codes first, then pump operation and system pressure, then the gas side with a manometer before condemning any component.
Classic diverter valve territory on a combi — either the valve head has failed or the valve body is sticking with sludge. On a system boiler it more often points to a motorised valve, cylinder stat or wiring centre fault.
We pressure-test and trace: visible joints, radiator valves and tails, the pressure relief valve discharge outside (a dripping discharge pipe is the giveaway), and the expansion vessel charge. Recharging or replacing a flat expansion vessel resolves a large share of these.
Ignition lock-outs point to gas supply, electrode, spark lead or fan and pressure switch. Overheat lock-outs point to flow restriction — sludge, a closed valve, a failing pump or a scaled heat exchanger. The code narrows it; the testing confirms it.
A boiler that fails on the first hard frost and shows a condensate or ignition-related code is usually a frozen external condensate run. We thaw and clear it, then re-route, upsize or insulate the pipe so the same freeze doesn't repeat every January.
Kettling is scale or sludge causing local boiling. Depending on severity we descale, cleanse or power flush, fit a magnetic filter and inhibitor, and re-balance. Where the exchanger is already damaged we'll say so honestly rather than flushing a lost cause.
Coventry, CV2 & the wider West Midlands.
Call us or request a written quote — we'll come back to you fast.
Local plumber · Coventry CV2 · Open 24/7
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