Gas & Heating Repairs in Thornaby

Heating gone off? Gas heating repairs from £75, most fixed same day. Gas Safe registered (972035).

We cover all of Thornaby — the Village, Mandale, Stainsby, Bassleton, Thornaby Road, and the riverside apartment developments. Thornaby has a distinctive mix: the Victorian Village area with period properties and original heating systems, large 1960s-70s council-built estates across Mandale, Stainsby, and Bassleton with microbore pipework and aging conventional boilers, and modern riverside apartments with compact combi installations. Each type brings its own set of heating problems, and we know them all.

Common Gas Heating Problems We Fix

Microbore pipework restrictions — This is Thornaby’s signature heating issue. The 1960s-70s estates in Mandale, Stainsby, and Bassleton were built with microbore (8mm or 10mm) pipework instead of standard 15mm copper. These narrow pipes block more easily with sludge and are harder to flush. When they get restricted, some radiators heat up while others stay stone cold. We’re experienced with microbore systems and know how to get them working properly.

Radiators cold downstairs, hot upstairs (or the reverse) — On gravity-fed conventional systems, this usually means the pump is weakening or a motorised valve is partially stuck. On microbore systems, it’s often a blockage in the manifold or distribution tee. We check the whole circuit to find where the flow is being restricted.

No heating but hot water works — Diverter valve failure on combi boilers, or a seized Honeywell motorised valve on conventional systems. One of our most common callouts. The valve gets stuck in the hot water position and won’t switch. Usually sorted within an hour once we’ve confirmed the fault.

Boiler keeps cutting out — Could be low pressure, a blocked condensate pipe in winter, overheating from restricted flow (common with partially blocked microbore), or a faulty flame sensor. We test each possibility systematically rather than guessing.

Thermostat not controlling the temperature — Old wired programmers fail, wireless stats lose connection or run out of battery, and wiring develops faults over decades. If your heating comes on at random or won’t respond to the controls, we’ll find out why and fix it.

Gas Heating Repair Costs

Repair Type	Guide Price
Call-out and diagnosis	From £75
Thermostat or programmer replacement	£75 - £150
Radiator valve replacement (TRV or lockshield)	£80 - £150
Pump replacement (Grundfos/DAB)	£150 - £300
Motorised valve replacement	£150 - £250
Diverter valve replacement	£150 - £250
PCB (circuit board) replacement	£200 - £400
Microbore manifold repair/replacement	£100 - £250

Guide prices — we’ll give you an exact quote once we’ve found the fault. The £75 call-out is deducted from the repair cost if you go ahead.

What’s Included

• Full system diagnosis — boiler, radiators, pump, valves, pipework, and controls
• Microbore system assessment where relevant
• Clear explanation of the fault and repair options
• Fixed-price quote before any work begins
• Quality replacement parts fitted properly
• Full safety testing after every repair
• Gas Safe certificate where required
• 12-month guarantee on parts and labour

Our Repair Process

Ring us or book online. No-heating emergencies get priority — same-day when we can manage it. We arrive with diagnostic equipment and a well-stocked van carrying common parts for the boiler brands found across Thornaby. First step: find the fault. We test the boiler, check every radiator, inspect the pump and valves, and trace any leaks or blockages. You get a fixed price before we start. Most repairs take one to two hours. Once the new part is fitted, we test the whole system and issue a Gas Safe certificate.

Microbore Pipework in Thornaby’s Estates

The 1960s-70s estates across Mandale, Stainsby, and Bassleton were built with microbore central heating — a system that uses narrow 8mm or 10mm pipes running from manifolds to each radiator instead of the standard 15mm copper loop. At the time, it was quicker and cheaper to install. The problem is that these small-bore pipes clog up with magnetite sludge much faster than standard pipework, and they’re harder to clear.

When a microbore system gets partially blocked, you get some radiators working and others completely cold. The manifolds — the distribution points where the small pipes branch off — can corrode internally or get blocked at individual outlets. We can isolate which pipe or manifold is causing the problem and either clear it or replace the affected section.

If your property has microbore and you’re having heating problems, a standard powerflush may not be enough. We sometimes need to flush individual microbore runs separately or use a more targeted approach. We also fit magnetic system filters (like a MagnaClean) to catch sludge before it reaches the narrow pipes again.

Modern boilers fitted to microbore systems need careful setup. The flow rates are different from standard pipework, and if the boiler isn’t adjusted properly you get overheating, short-cycling, or poor circulation. We make sure the boiler settings match the system it’s connected to.

Warning Signs Your Heating Needs Repair

• Some radiators heating up while others stay cold — especially common with microbore
• Boiler pressure dropping below 1 bar and needing regular top-ups
• Strange noises — banging, whistling, or gurgling from pipework or radiators
• Heating not responding to the thermostat or timer settings
• Lukewarm radiators even when the boiler is running at full output
• Any smell of gas — turn off the gas at the meter and call 0800 111 999 immediately
• Pilot light burning yellow instead of blue — a carbon monoxide risk

When to Repair vs Replace

Pumps, valves, and thermostats are always worth replacing — £75-£300 for a component that’ll last another 10+ years. For microbore systems, if individual manifolds or pipe runs are blocked, targeted repairs make sense. If the whole microbore network is corroded and causing repeated problems, converting to standard 15mm pipework during a boiler replacement might be the better long-term solution. For boilers under 10 years old, repair nearly always makes sense. Over 15, weigh the repair cost against replacement.

Is microbore pipework a problem for modern boilers?

Microbore works fine with modern boilers as long as the pipes are clear and the boiler’s set up correctly. Problems come when the narrow pipes get partially blocked with sludge — the reduced flow causes the boiler to overheat and cut out. We check flow rates and adjust the boiler settings to match. If the pipes are too far gone, we’ll discuss options for upgrading sections of pipework.

How quickly can you attend a heating emergency in Thornaby?

We prioritise no-heating emergencies, especially in winter. Same-day attendance when possible, next-day at most. We carry common parts on the van for the boiler brands typically installed across Thornaby’s estates, so there’s a good chance we can fix it on the first visit. Contact us and we’ll get you booked in as quickly as we can.

Do you charge if you can’t fix the problem on the first visit?

The £75 call-out covers diagnosis. If we identify the fault but need to order a specific part, you don’t pay again for the return visit — just the agreed repair cost. We always explain upfront what’s needed and what it’ll cost, so there are no surprises.

Can you upgrade my old programmer or thermostat during a repair?

Yes. If your old Honeywell programmer or wired thermostat has failed, it’s a good opportunity to upgrade to a modern wireless stat or smart controls like Nest or Hive. Better control of your heating means lower bills and better comfort. We’ll advise on what’s compatible with your boiler and system type.

Should I get a powerflush if my radiators keep going cold?

If your radiators have cold spots or some aren’t heating at all, a powerflush can clear out the sludge causing the problem. For microbore systems, we may need a more targeted approach rather than a standard whole-system flush. After flushing, we fit a magnetic filter to catch future sludge before it blocks the narrow pipes again. We’ll assess your system and tell you honestly what it needs.

Need your gas heating sorted? Book a repair or check out our full gas heating repairs service. Also covering the wider Thornaby area.