What are the most common boiler faults?

The most frequent boiler issues include loss of pressure (often caused by a small leak in the system or a faulty pressure relief valve), the boiler locking out and displaying an error code, no hot water despite the heating working (usually a faulty diverter valve), strange banging or kettling noises (caused by limescale build-up on the heat exchanger), and the pilot light going out on older models.

How much does a boiler repair typically cost?

Boiler repair costs depend on the specific fault and the parts required. A simple fix like repressurisung the system or replacing a sensor may be relatively inexpensive. Replacing a PCB, heat exchanger, or fan motor costs more. Your engineer provides a clear quote after diagnosing the fault, so you know the full cost before agreeing to proceed.

Should I repair my boiler or replace it?

As a general guide, if your boiler is over 10-15 years old and the repair cost is more than a third of a new boiler, replacement is often the better investment. Newer boilers are significantly more energy-efficient, which can lower your gas bills. Your engineer will give you an honest assessment and never push a replacement if a repair makes more sense.

How long does a typical boiler repair take?

Most boiler repairs are completed within one to three hours, depending on the fault. Common issues like a faulty thermostat or pressure sensor can be fixed in under an hour. More involved repairs, such as replacing a heat exchanger, may take longer. If a part needs to be ordered, your engineer will arrange a return visit as soon as it arrives.

Boiler Repair in Glasgow

A broken boiler means no heating and no hot water — two things no household can do without for long. OnCall Home Repairs connects you with Gas Safe registered heating engineers in Glasgow who diagnose and repair boiler faults quickly and safely. Whether your boiler has stopped firing, is making unusual noises, is losing pressure, or is showing an error code, we will match you with an engineer who can get it working again. Available 24/7 for emergency breakdowns.

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Common Boiler Problems and When to Call an Engineer

Boilers are complex appliances that combine water, gas, and electronics. When something goes wrong, the symptoms can be confusing. You might find your radiators are lukewarm but the hot water is fine. The boiler might fire up and then shut down after a few seconds — a fault known as lockout. You could notice a drop in boiler pressure on the gauge, or hear banging, gurgling, or whistling sounds from the unit. Some faults trigger an error code on the display panel, while others give no obvious clue at all.

Whatever the symptom, the underlying cause needs to be identified by a qualified Gas Safe engineer. Gas appliance repair is not a job for a general handyperson or a DIY attempt — it is a legal requirement that only Gas Safe registered engineers work on gas boilers. The engineers in our network hold current Gas Safe registration, specialise in domestic boiler repair, and carry common replacement parts so that many faults can be resolved in a single visit.

Typical repairs include replacing faulty diverter valves, fan assemblies, printed circuit boards (PCBs), thermistors, and pressure relief valves. If your boiler is beyond economical repair, your engineer will explain why and discuss boiler replacement options. For issues affecting your wider central heating system — such as cold radiators or pump failures — we can help with that too.

How Boiler Repair Works

Describe the Fault

Call 0333 240 8428 and tell us what your boiler is doing — or not doing. Is it showing an error code? Has it lost pressure? Is there no hot water, no heating, or both? These details help us match you with the right engineer.

Gas Safe Engineer Dispatched

We connect you with a Gas Safe registered heating engineer near Glasgow. For emergency breakdowns, engineers are available 24/7. For non-urgent faults, we can arrange a convenient appointment time.

Diagnosis on Site

Your engineer inspects the boiler, runs diagnostic checks, and identifies the fault. They explain the problem in plain English and give you a clear, upfront quote for the repair. No work starts without your approval.

Repair with Quality Parts

The engineer carries out the repair using manufacturer-approved or equivalent-quality parts. Once the repair is complete, they test the boiler thoroughly — checking ignition, pressure, flue output, and safety controls before handing it back to you.

Why Choose OnCall for Boiler Repair

Gas Safe Registered Engineers

Every engineer in our network holds current Gas Safe registration. Your boiler is in safe, qualified hands — always.

Same-Day Repairs When Possible

Many boiler faults can be diagnosed and fixed during the first visit. Our engineers carry common parts to minimise waiting time.

All Major Boiler Brands Covered

Worcester Bosch, Vaillant, Baxi, Ideal, Glow-worm, Viessmann — our engineers are experienced with all major brands found in Glasgow homes.

Transparent Pricing

You receive a fixed quote after diagnosis. The price you agree to is the price you pay. No hourly rate surprises or extra charges for parts.

24/7 Emergency Availability

Boiler breakdowns in winter cannot wait. Our network is available around the clock, including evenings, weekends, and bank holidays.

Workmanship Guarantee

All repair work is guaranteed. If the same fault returns after the repair, we send an engineer back to resolve it at no additional cost.

Related Heating Services

Boiler Servicing Central Heating Repair Boiler Installation Emergency Plumber

Boiler Repair Across Glasgow

Our network of Gas Safe heating engineers covers Glasgow and the surrounding area. Whether you live in Partick, Hillhead, Govan, or one of the smaller villages like Pollokshields or Cathcart, we can connect you with a local engineer who can attend quickly. Our engineers are familiar with the boiler types commonly installed in properties across Glasgow.

GlasgowPartickHillheadGovanShawlandsMaryhillDennistounPollokshieldsCathcartJordanhillAnnieslandSpringburnBridgetonRutherglenCambuslangBearsden

Frequently Asked Questions

Boiler Broken? Get It Fixed Today

Call OnCall Home Repairs on 0333 240 8428 and we will connect you with a Gas Safe registered engineer in Glasgow. Upfront pricing, guaranteed workmanship, and same-day repairs where possible. Available 24/7 for emergency breakdowns.

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