Diagnosis and repair of commercial boilers, hot-water plant and controls, carried out by Gas Safe registered engineers.
Our Services
Commercial Boiler Repair Services
About This Service
Getting your heating and hot water back without guesswork
Welm Facilities Maintenance carries out commercial boiler repairs in Sale for packaged boilers, hot-water plant and controls. Heating Engineer based in Sale, serving Altrincham, Withington and Didsbury and the surrounding area.
Every gas repair is carried out by a Gas Safe registered engineer (Gas Safe No. 563107). We work on packaged boilers, modular plant, calorifiers, heater banks and heat interface units across a wide range of makes and sizes. We trace each fault through the burner, pumps, valves and controls, so the part we replace is the one that failed.
Our Process
How It Works
01
Fault Triage
Tell us about the fault through our contact page or by phone. An engineer talks it through with you, advises on isolation and safety, and decides whether the site needs a visit straight away.
02
On‑site Diagnosis
A Gas Safe-registered engineer completes systematic diagnostics in the plant room, identifies root cause and provides a clear repair plan and timescale.
03
Repair, Test & Handover
We carry out repairs with manufacturer-approved parts where possible, complete safety checks and issue a written fault report and recommendations to prevent recurrence.
Benefits
Why Choose us for Commercial Boiler Repair Services?
Minimised business downtime
Team-led diagnostics and a practical spares approach get boilers and hot-water systems back online quickly to protect staff, customers and processes.
Gas Safe registered engineers
All gas work is carried out by Gas Safe registered engineers, and the plant is safety checked before it goes back into use.
Commercial experience & range
From packaged boilers and plant-room burners to controls and heat interface units, we repair a wide variety of makes and commercial plant-room equipment.
Common commercial boiler faults we repair
Locking out or not firing. We check the gas supply, ignition and flame detection at the burner, then the controls that call for heat, to find out why the boiler has stopped.
Losing pressure. We look for leaks on the system, check the pressurisation unit and expansion vessel, and test the safety valves.
Showing a fault code. A code points to an area, not always the cause, so we confirm it with tests at the burner, pump or sensor before replacing anything.
Cutting out. A boiler that starts and then stops often has a flow problem, an overheat, a flue or air supply issue or a failing sensor. We check flow through the pumps and valves and test the boiler's safety controls.
Hot-water plant or calorifier not heating. A calorifier is the large hot-water cylinder heated by the boiler. We check the flow from the boiler, the pumps, motorised valves and controls, and look for scale on the heating coil.
Controls or BMS faults. Sometimes the boiler is fine but is not being told to run. We check time clocks, sensors and the signals between the boiler and the building management system (BMS) that runs the site's heating.
How quickly we can get to you and what affects the cost
Our office hours are Monday to Friday 8am to 5pm and Saturday 9am to 1pm. When a commercial boiler fails, we triage the fault first and attend high-priority failures as a priority. We cannot guarantee a set response time, because it depends on where the site is and what is already booked in, but we will tell you honestly when an engineer can be with you.
The cost of a repair depends on:
the type and size of the boiler or plant
the part needed, and whether it is in stock or has to be ordered
how easy it is to get into the plant room and reach the fault
whether the work is done in normal hours or out of hours
We explain what we have found and what the repair will cost before work starts. For planned maintenance that cuts the chance of a breakdown, see our commercial heating services. You can also see the areas we cover, including our Sale page.
What our customers say
"I had an issue with boiler, and welm were quick to respond to my query and to come out and assess the situation, they clearly knew what they were talking about. They were able to offer a very competitive price( I got 3 quotes) the job was done in a timely manner , and the area was left clean and tidy.i would definitely recommend to anyone." - Kerry, Google
"Mike has serviced our boilers for a couple of years now, he is professional and reliable. Very happy to recommend him!" - Will, Google
Welm has an average rating of 4.8 from 25 Google reviews.
37+
Five-Star Reviews
7
Specialist Services
3+
Industry Accreditations
7+
Areas Covered
FAQ
Frequently Asked Questions
Yes. All gas-side repairs are carried out by Gas Safe-registered engineers (Gas Safe No. 563107). We follow current gas safety and combustion standards and provide written safety checks after any repair.
Report a Commercial Boiler Fault
Tell us what the boiler is doing and where the plant is. We will triage the fault and arrange for an engineer to attend as soon as we can.
Related Services
Other Services We Offer
37 Five-Star Reviews
“Fantastic 5 star, flawless service and even better, great value too.
I d highly recommend this company”— Google
REVIEWS
What Our Customers Say
“Fantastic 5 star, flawless service and even better, great value too.
I d highly recommend this company”
Google2026-05-22“Replaced plug in sink and fixed leak under the sink. Great job
”
— Mark Watson
Google2026-05-07“Spot on service
Reliable and professional”
— Anthony McLoughlin
Google2026-04-28