✓ AR Heating & Gas. Servicing the North East for over 16 years.

Boiler Repair in
Seaham

Boiler repair across Seaham and SR7 from Gas Safe registered engineers based nearby in Houghton le Spring. Finding the fault costs a fixed £96, with no separate call-out fee on top, and nothing further is spent until you agree the repair price.
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AR Heating & Gas
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Boiler down in Seaham? We can often get out the same day. No obligation chat, call 0191 540 2051
2010
Established
£96
Fixed diagnosis fee
4.9★
Google rating
Same day
Attendance available

One list, no guesswork

£96 buys the diagnosis visit and no call out fee is added. If we clear the fault in that visit with no parts, you owe nothing further. If it needs a part, here is what it costs, fixed, and nothing is ordered until you say yes.

Repair name Repair category Fixed price
Sensor Boiler £120
Electrodes Boiler £130
Plate heat exchanger Boiler £260
Fan Boiler £300
Thermostat (not smart controls) Controls £180
Pump Central Heating £220
Motorised valve Central Heating £175

These prices exclude your £96 inspection

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Gas Safe registered engineer diagnosing a boiler fault

Diagnosing the fault properly

Seaham is about 7 miles from our base in Houghton le Spring, around 15 to 20 minutes by road through Hetton le Hole and Murton. It is the first of the coastal towns on our patch, with Sunderland to the north and Peterlee to the south, and we also cover Hetton le Hole, Houghton le Spring and Washington inland.

The housing is a mix of pit terraces in Dawdon, Deneside and New Seaham, interwar and postwar estates at Parkside, and new builds at Seaham Garden Village. Near the coast, exposed flue terminals and outside fittings deserve a careful inspection because they see more weather than protected inland installations.

Hot-water problems can have several causes that feel similar at the tap: a restricted plate heat exchanger, a diverter valve not moving fully, a flow sensor fault or an issue with incoming flow. We measure rather than guess. Flow at the tap, temperature rise across the boiler and incoming pressure are checked alongside gas pressure under load, the flue and the safety devices. Water hardness varies by postcode, so we do not assume scale is the cause without evidence.

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✓ Hot water gone lukewarm in Seaham? Tell us and we will call you back. Get a call back now

Common boiler faults we see in Seaham

The same symptom can come from several different components, so the useful local advantage is being nearby and diagnosing the appliance rather than guessing from a postcode.

Hot water running hot then cool

A restricted plate heat exchanger is one possibility, but so are a diverter valve, flow sensor or another control fault. If scale is suspected, the water supply and appliance are checked before recommending treatment. A guide to limescale and boilers explains why water hardness should be checked by postcode rather than assumed across a whole town.

One thing worth knowing: a power flush cleans the heating circuit. It is not automatically the answer to a domestic-hot-water fault inside a combi boiler.

Flue and external fittings near the coast

External terminals, clips and pipework on exposed properties can take more weather than protected inland installations. We inspect the flue and terminal as part of the diagnosis rather than replacing internal parts while an external problem is being missed.

Older terraces in Dawdon, Deneside and New Seaham

A lot of pipework in older streets is buried in solid floors or boxed in, so a small leak can go unseen for a long time. What you notice instead is a pressure gauge that keeps falling. The cause may be a leak, a failed expansion vessel or a relief valve letting water by, and we pin down which one before any money is spent.

Newer homes at Seaham Garden Village

Newer homes tend to have newer boilers, and some faults may still be covered by the manufacturer's warranty. Check your paperwork before you book, as the warranty may be the cheapest route. If the boiler is out of warranty, or the fault is not covered, we can help.

How the price works

The fault finding visit is £96, fixed, with no call out fee on top. After that comes one fixed price for the repair, agreed before any part is ordered. Our repair cost guide lists typical figures.

Makes we repair around Seaham

We work on the major domestic boiler brands and diagnose the fault before replacing parts.

🔥
Worcester Bosch
Greenstar ranges, old and new, including hot-water, ignition and pressure faults.
🌡️
Vaillant
ecoTEC and ecoFIT, including F22, F28, F29 and F75 faults traced to the underlying cause.
⚙️
Baxi
Duo-tec, Platinum, 600 and 800 ranges, including fans, valves and heat-exchanger faults.
🔩
Ideal
Logic, Logic Plus, Vogue and Independent, including recurring ignition and circulation faults.
🧰
Potterton and Glow-worm
Older boilers, with honest advice when repair cost or parts availability makes replacement more sensible.
✅
Other brands
Alpha, Ferroli, Intergas, Vokera, Viessmann and many other domestic gas boilers.
Sometimes a repair is not the answer

An older boiler facing a major repair may not be worth saving. New boilers start from £1,790 fitted, with finance through Ideal4Finance subject to status. Our quote tool gives you a fixed price in about a minute.

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Seaham areas and postcode we cover

Seaham is about 7 miles from our base in Houghton le Spring, so it is a short run down the road for us.

Postcode: SR7.

  • The town: Seaham Harbour, Dawdon, Deneside, Parkside, Westlea and New Seaham.
  • The coast road: Seaton, Seaham Garden Village and the Seaham Hall side.
  • The villages inland: Murton, Dalton le Dale, Cold Hesledon and Hawthorn.

Hetton le Hole, Sunderland, Houghton le Spring and Peterlee are the neighbouring towns, each with its own page. Close by but not named here? Call 0191 540 2051 and we will let you know.

Seaham repair questions answered

Straight answers about diagnosis, prices and the areas we reach.

Why is my hot water hot one minute and cold the next? +
A restricted plate heat exchanger is one possibility, but it can also be a diverter valve, flow sensor or another control fault. We test flow and temperature rather than assuming the cause from the symptom alone.
Will a power flush get rid of limescale? +
A power flush cleans the central-heating circuit. It is not automatically a fix for a domestic-hot-water problem inside a combi boiler. The underlying fault needs diagnosing first.
Is a scale reducer worth having in SR7? +
It depends on the actual water supply, boiler and manufacturer guidance. Northumbrian Water advises checking water quality by postcode, so we do not assume one answer applies to every Seaham property.
My flue terminal looks rusty. Should I worry? +
A damaged or badly corroded flue terminal should be checked. The flue is a safety-critical part of the installation, so switch the boiler off if you are concerned and arrange an inspection.
Does living near the coast change what you check? +
On more exposed properties we pay particular attention to the external flue terminal, its fixings and outside pipework. The annual service interval remains the same unless the manufacturer says otherwise.
What does a boiler repair in Seaham cost? +
A fixed £96 for the diagnosis, with no separate call out fee on top. If a part is needed, you get the repair price before anything is ordered.
Do you cover Murton and Seaham Garden Village? +
Yes, along with Dawdon, Deneside, Parkside, New Seaham, Seaton, Cold Hesledon and Dalton le Dale. If you are just outside SR7, call 0191 540 2051 and we will confirm coverage.
My boiler is only a couple of years old. Should I call you? +
Check your manufacturer warranty first, because the maker may cover the repair. If it is out of warranty, or the fault is not covered, give us a ring.

Guides for Seaham homeowners

Boiler faults, pressure, servicing and error codes explained by our engineers.

What Is the Best Boiler for a North East Home? Buying a New Boiler
October 12, 2026
The best boiler is the one sized correctly for your house and fitted properly. Here is how the four brands we are ask...
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How Long Does a Boiler Service Take? And Every Other Job, Timed Boiler Servicing
October 12, 2026
A boiler service takes about an hour. A repair can be twenty minutes or two visits. A new boiler is a day. Here is wh...
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Boiler Brands
October 4, 2026
Vaillant vs Baxi boilers compared: model choice, installed price, reliability considerations and what really matters ...
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Seaham boiler on the blink?

Tell us what it is doing and when it started. We diagnose for a fixed £96, then give you one price for the repair. Nothing goes ahead until you are happy.

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