What's Actually Included in a Boiler Service? The Full York Checklist, No Jargon

Boiler servicing is the second biggest reason people call us, and the question underneath most of those calls is really the same one: what am I actually paying for? Fair question. A lot of people have had the experience of an engineer in and out in twenty minutes, sticking a sticker on the boiler and taking the money. Here's what a proper service actually involves, step by step, so you can tell the difference.

What we actually check

Full visual inspection: the boiler, the pipework around it, and anywhere water or gas could be escaping without you noticing.
Flue and ventilation check. Exhaust gases, including carbon monoxide, need to actually get out of your house rather than build up where they shouldn't.
Gas pressure and burner check: confirming the boiler's burning gas at the right pressure. Run it too lean or too rich and it wastes gas or wears parts out faster.
Safety device test. These are the devices that shut the boiler down if something goes wrong, so they get tested every time rather than assumed to be fine.
Casing and seals inspection: checking nothing's cracked, loose, or letting gas or fumes escape where it shouldn't.
Full strip-down and clean of the heat exchanger. This is the part that actually heats your water, and debris builds up in here over a year. It's the single biggest cause of boilers running inefficiently or breaking down early.
Condenser trap cleared out. A blocked condensate pipe is one of the most common reasons a boiler trips out in cold weather, and an easy thing to miss if nobody's looking.
CO alarm check: if you've got one fitted, we'll check it's actually working, not just present.
Written service record. Proof of what was checked, dated and kept for your own records and for any warranty claim down the line.

Why the heat exchanger clean matters more than people think

Most of what causes a boiler to fail isn't a dramatic fault, it's slow build-up inside parts you never see. A heat exchanger that's never been stripped down and cleaned has to work harder every year to do the same job, and that's what eventually shows up as a breakdown on the coldest night of the year rather than a quiet fix in autumn. This is the part of a service that takes the time, and it's also the part that gets skipped entirely by anyone doing the twenty-minute version.

What it costs, and what you get for it

A one-off boiler service York homeowners book with us is £120, and that covers everything on the list above, not a stripped-down version of it. You'll get a written record at the end, so if a manufacturer ever queries a warranty claim, you've got proof the annual boiler service York warranty terms require actually happened, and what was found when it did. If you're booking this every year anyway, which most people end up doing, our Care Plan works out cheaper over time and throws in a free CO alarm.

Landlords, this applies to you too

If you're a landlord, the annual check isn't optional, it's a legal requirement, and it covers some of the same ground as a service plus the gas safety certificate itself. If you're not sure how a standard service differs from a CP12 landlord certificate, that's worth reading separately, since the two get confused a lot.

Booking an honest service in York

We'll always tell you straight if something's found during a service rather than just quietly fixing it and adding it to the bill. If you want to know exactly what happens on the day before you commit to anything, call 01904 206190 or WhatsApp 07414 291034 and ask. We're happy to walk you through it.

Last updated November 2026 by The Boiler Doctor, York.