No Heating
Rapid diagnosis of failed diverter valves, broken pumps, and faulty PCB boards. I carry common parts to fix most boilers on the first visit.
Gas Safe registered
Boiler repair in Cardiff — warm again, fast.
Gas Safe registered serving Cardiff and the surrounding areas. I diagnose and fix boiler faults fast — no heating, no hot water, fault codes, and pressure issues.
- No call-out fee
- Price agreed before I start
- Gas Safe & fully insured
Local knowledge
Why Cardiff boilers fail — and why it is rarely limescale
A lot of boiler advice written for the UK market is written for hard water England, and it does not describe what actually goes wrong here. Cardiff's water comes off Brecon Beacons sandstone and shale rather than chalk or limestone, and it is soft to slightly hard. Limescale exists but it is a minor factor. If your boiler has failed at eight or ten years old in Cardiff, scale is very unlikely to be the reason.
What I find instead is magnetite — black iron oxide sludge produced as steel radiators corrode from the inside. Cardiff's terraced housing stock has a lot of original steel radiators and older pipework, systems that have been drained and refilled repeatedly over the years, and often no inhibitor left in them. The sludge collects in the heat exchanger and the pump, causing the symptoms people usually describe as the boiler "kettling", radiators cold at the bottom, or heating that works until it suddenly does not.
The second thing I see constantly on Cardiff terraces is siting. Boilers are very often in a rear kitchen extension, which puts the condensate pipe on an outside wall in a narrow side return. In a cold snap those freeze and the boiler locks out — a fault that looks alarming, costs nothing to fix, and can usually be prevented by lagging or re-routing the pipe. Before you replace a boiler on that history, it is worth having someone check whether the system is the problem rather than the appliance.
Boiler repair in Cardiff
Boiler Repair in Cardiff.
Reliable, professional service across Cardiff and the surrounding areas. Gas Safe registered, fully insured, and the one who turns up.
No Hot Water
Hot water issues caused by thermistors, heat exchangers, or diverter valves. Fast fault-finding and same-day repair where possible.
Fault Codes
I interpret and resolve all common boiler fault codes for Worcester Bosch, Vaillant, Ideal, Baxi, and more.
Low Pressure
Low pressure causing your boiler to lock out? I identify leaks and repressurise the system safely.
Pilot Light Out
Pilot light or ignition faults repaired, Gas Safe registered. Never attempt to relight yourself if you suspect a gas issue.
Honest Pricing
No call-out fees. I diagnose the issue and give you a fixed price before any repair work begins. No surprises.
Boilers · 13-second explainer
Soft water here. The boiler killer is sludge.
Most boiler advice is written for hard-water England, and blames limescale.
- Water off sandstone and shale, not chalk
- Limescale exists, but it’s a minor factor
- Magnetite sludge is what I find instead
- Fixed price before any repair work starts
From what I find repairing boilers across Cardiff and Caerphilly.
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24/7 in Cardiff
Plumbing emergency in Cardiff?
The phone is on day and night. I'll talk you through getting the water off before I've even set off, and I aim to be with you inside 90 minutes.
- Call-out feeNone
- First half hour, working hours£80
- Out of hours & weekends£150
- What I aim for, door to door90 min
Questions
Frequently asked questions.
Do I need a scale reducer on my boiler in Cardiff?
Almost certainly not for scale reasons. Water here is soft to slightly hard because the supply comes off sandstone and shale rather than chalk. Advice pushing scale reducers is generally written for hard water areas in England. Sludge and corrosion are the real risk on Cardiff systems.
My boiler stops working in cold weather then starts again — what is that?
That is the classic frozen condensate pipe, and it is very common on Cardiff terraces where the boiler sits in a rear kitchen extension with the condensate run on an outside wall. It is a cheap fix and usually preventable with lagging or re-routing.
My radiators are cold at the bottom but hot at the top.
That is sludge — magnetite from corroding steel radiators settling in the bottom of the panel. It is the most common underlying fault I find on older Cardiff systems, and it shortens boiler life. A power flush and a proper inhibitor dose addresses it.
Free quote
Need boiler repair in Cardiff?
Ring or WhatsApp and tell me what's happening. You'll get a straight answer and a price before I start.