Lost your heating or hot water? A Gas Safe registered engineer diagnoses the fault properly and tells you what it costs before any work starts. Most callouts attended same or next day.
A boiler that will not fire is rarely a mystery once it has been tested properly. The job is to find out which component has actually failed rather than replacing parts hopefully and billing for each attempt. You get the same engineer from the first phone call to the finished repair, and you will know the likely cost before anyone starts.
All gas work is carried out under Gas Safe registration number 574706. That number is checkable on the Gas Safe Register, and the ID card is carried on every visit. Only a registered engineer may legally work on your gas appliances.
Common failure parts are carried on the van, so a large share of repairs are completed the same visit. Where a part has to be ordered, you are told what it is, what it costs and when it can be fitted before you commit to anything.
If your boiler is doing any of the following, it is worth getting it looked at rather than waiting for it to fail completely on the coldest night of the year.
The most common callout of all. The cause is usually a failed diverter valve, a stuck pump, a faulty thermostat or programmer, an airlock, or a control fault stopping the boiler firing. Testing narrows it down quickly rather than replacing parts on a hunch.
If the gauge keeps dropping below roughly 1 bar and needs topping up again and again, there is usually a leak on the system, a failed expansion vessel, or a pressure relief valve passing water. Repeated topping up hides the fault and accelerates corrosion inside the system.
Modern boilers display a fault code and lock out to protect themselves. The code narrows the area but rarely names the failed part on its own, so it needs interpreting alongside actual testing of the ignition, sensors, fan and gas supply.
Water around the boiler or under pipework needs looking at promptly. It may be a failed seal, a corroded heat exchanger, a leaking pump head or a joint that has given way. Left alone, a slow leak damages the boiler's electrics and the surrounding fabric of the property.
Kettling normally means limescale or sludge restricting flow through the heat exchanger, which makes the boiler work harder and shortens its life. Gurgling can point to trapped air or, in winter, a frozen condensate pipe.
Cold at the bottom usually means sludge; cold at the top usually means air. Whole rooms staying cold often points to a zone valve, pump or control fault rather than the boiler itself, which is why the whole system gets checked rather than just the appliance.
Nobody can price a repair honestly before diagnosing it, because the cost follows whichever component has failed. Across the UK, most domestic boiler repairs land somewhere between £120 and £500 once parts and labour are counted, with the average sitting near £300. Small jobs such as a thermostat, sensor or pressure fault sit at the lower end; a fan, PCB or heat exchanger sits well above it.
The callout covers attendance and the first hour on site, which is normally enough to diagnose the fault and complete many of the smaller repairs. If parts or further labour are needed, you get the figure before the work goes ahead — not afterwards on an invoice.
If the sensible answer is that the boiler is not worth repairing, you will be told that too, with the reasoning behind it.
Worcester Bosch, Vaillant, Ideal, Baxi, Glow-worm, Potterton, Viessmann and Alpha, among others — covering combi, system and conventional boilers.
Older systems are welcome too. S-plan and Y-plan controls, zone valves, pumps and cylinder thermostats are all part of the job rather than a reason to walk away.
Covering Swindon (SN1–SN6), Wroughton, Highworth, Purton, Royal Wootton Bassett and surrounding Wiltshire villages.
Plenty of firms reach for a new boiler quote at the first sign of trouble. Sometimes that genuinely is the right answer, and sometimes it is not.
A boiler under roughly ten years old, with a single failed component, no history of repeat faults, and a system otherwise in good condition. Most repairs in this bracket cost a fraction of a replacement.
A boiler in its low teens facing a major part such as a heat exchanger or PCB, or one that has needed several repairs in a short period. Here the maths is genuinely close and depends on your plans for the property.
An older appliance with obsolete parts, a corroded heat exchanger, or repeated failures where each fix buys only a few months. Replacement also opens up efficiency gains and the option of a heat pump.
Most repairs fall between £120 and £500 including parts and labour, averaging around £300 nationally. The figure depends on which component failed, so a diagnosis comes first and the price is confirmed before work starts.
Most Swindon callouts are attended the same or next day, and the majority are completed in one visit where the part is a common one. If a part has to be ordered, you will know the cost and timing before committing.
Check the boiler has power, the thermostat is calling for heat, the programmer is set correctly, and the pressure gauge reads about 1 to 1.5 bar when cold. Also check other gas appliances still work. If all that looks right, it needs an engineer.
Usually a leak on the system, a failed expansion vessel, or a pressure relief valve passing water. Repeated topping up masks the fault and adds fresh oxygenated water, which speeds up corrosion inside the system.
As a rough guide, over ten to twelve years old with a repair approaching a large share of replacement cost tips toward replacing. But plenty of older boilers are worth fixing when the failed part is straightforward. You will get an honest view either way.
Yes — it is a legal requirement, not a preference. Service Heat & Cool is registered under Gas Safe number 574706, and you are welcome to check that on the Gas Safe Register before any work begins.
