Complex & intermittent
We are comfortable investigating faults that are difficult to reproduce or have already resisted a simple repair.
Natural gas & LPG boiler repairs in Cardiff
We fix boilers.
Not just replace them.
From everyday breakdowns to complex or intermittent faults that can be difficult to trace, our experienced team provides fast, methodical diagnosis. We explain what has failed, what it will take to fix it and whether repair is sensible before work continues.
Natural gas & LPGMulti-award-winning1,000+ customer reviewsCardiff-based
Boiler repairs
Fast diagnosis. Experienced fault-finding.
We are experienced in tracing boiler faults, including problems that do not always show themselves straight away. Rather than swapping parts and hoping for the best, we test the boiler and system logically, follow the evidence and work towards an accurate diagnosis. Our engineers repair natural gas and LPG boilers and give you clear advice before any work begins.
- Fast boiler breakdown diagnosis
- Complex and intermittent faults
- No heating or hot water
- Pressure and circulation problems
- Ignition and lockout faults
- Heating-control fault-finding
- Natural gas boiler repairs
- LPG boiler repairs
Complex faults welcome
Some faults need more than a reset.
Repeated lockouts, unexplained pressure loss, unusual noises, temperature changes and faults that come and go can take proper investigation. This is where experienced, structured fault-finding matters.
Test, don’t guess
We use the symptoms, boiler readings and system behaviour to narrow the fault down before recommending parts.
Help us diagnose faster
Send the make, model, fault code and a photo or short video on WhatsApp before the visit whenever possible.
A genuinely fix-first approach
Repair first.
Replace only when it makes sense.
Some companies are built around selling new boilers. At SMC, we start with the fault. If your existing boiler can be repaired safely and economically, we will tell you.
- Experienced boiler fault-finding
- Clear options before work begins
- No pressure to replace unnecessarily
FIXFIRST
“Boiler installs are down this year—because we keep fixing them.”
Why choose SMC?
Experienced fault-finding. Straight answers.
Established in 2011, SMC is Gas Safe registered for natural gas and LPG work. Our multi-award-winning local team focuses on accurate diagnosis, sensible repairs and keeping you informed from start to finish.
Read customer reviewsBoiler playing up?
Tell us what it’s doing.
Share the make, model, fault code and your Cardiff postcode. A photo on WhatsApp can help us understand the problem faster.