Boiler Repairs & Servicing
A boiler that breaks down in winter is almost always a boiler that missed its annual service — most common faults (a failed pressure sensor, a blocked condensate pipe freezing in cold weather, a worn part flagged early) are either caught or prevented by a routine service, which is also what keeps a manufacturer's warranty valid.
What's Included
- Breakdown diagnosis and repair for gas boilers
- Annual servicing to keep the system safe, efficient, and under warranty
- Condensate pipe checks — a common cause of winter breakdowns when it freezes
- Clear explanation of any fault found, with parts and labour quoted before work starts
How It Works
- 1 Describe the fault (error code, no heat/hot water, unusual noise) or book a routine annual service
- 2 Full inspection of the boiler's key components and safety devices
- 3 Fault diagnosis and repair, or a service report if nothing is currently wrong
- 4 Confirm safe operation and correct pressure before finishing
Common Issues
- • Boiler lockouts from a frozen condensate pipe in winter
- • Low system pressure causing an error code or lockout
- • Boilers overdue an annual service breaking down under winter load
Pricing: Annual service typically £80–£120; repairs quoted per fault (indicative — confirm actual pricing with Rainbow Fix Ltd)
Boiler Repairs & Servicing — Frequently Asked Questions
My boiler has stopped working and is showing an error code — what should I do first?
Note the exact error code before calling, since it significantly speeds up diagnosis — most modern boilers display a specific fault code rather than a generic error. Check the system pressure gauge too (most boilers need it in a specific range, often around 1–1.5 bar when the system is cold), since low pressure is one of the most common causes of a lockout and can sometimes be safely topped up yourself if the boiler has a filling loop, though if you're not confident doing that, it's fine to leave it for the engineer.
Why does my boiler keep breaking down every winter?
Winter breakdowns are disproportionately common and usually trace back to one of two things: a condensate pipe (the plastic pipe carrying waste water outside) freezing in cold weather and causing a blockage lockout, or a fault that was already present but only becomes noticeable when the boiler is working harder in cold conditions. An annual service before autumn catches most of these before they turn into a winter breakdown, which is exactly why servicing is best booked in September or October rather than waiting for the first cold snap.
What actually happens during an annual boiler service?
A proper service includes inspecting the burner and heat exchanger, checking the flue for safe operation, testing safety devices, checking gas pressure and flow, and confirming the boiler is running safely and at the correct efficiency — not just a visual check and a sticker. You should be given a written record of what was checked, which also matters for keeping most manufacturer warranties valid, since they typically require proof of annual servicing.
Is it cheaper to keep repairing an old boiler or replace it?
As a rough guide, if a boiler is over 10–15 years old and needing repairs more than once a year, the running cost of an inefficient old boiler plus repeated repair bills often exceeds the cost of a new, more efficient one over a few years — but this genuinely depends on the specific fault and boiler, so it's worth an honest assessment rather than a blanket rule. See the New Boiler Installation page if a straight comparison would help you decide.