Fault Finding & Repairs
Boiler Repairs & Fault Finding
Fault finding and repairs across a wide range of boiler makes and models, including pressure loss, leaks, fault codes, and no heating or hot water.
Gas Safe Registered – Reg No. 653502
Professional, Reliable Workmanship
Boiler Breakdowns, Repairs & Fault Diagnostics in Chislehurst, Bromley & Surrounding Areas
Boiler Broken Down? No Heating or Hot Water?
When your boiler stops working, you need an experienced engineer who can identify the problem and recommend the right solution.
OnTime provides professional domestic gas boiler fault finding, diagnostics and repairs across Chislehurst, Bromley and surrounding areas.
From ignition failures and boiler lockouts to leaks, pressure loss and heating faults, we investigate the cause and explain the available repair options.
Speak directly with a Gas Safe registered engineer to arrange the next available appointment. Same-day attendance may be available, subject to existing bookings.
Request an Engineer
LOCAL SERVICEBoiler Fault Diagnosis — £100
Professional fault investigation, with clear advice on the findings and recommended next steps. Any necessary replacement parts or additional repair work will be discussed and quoted separately.
Request a callback to discuss availability. The callback is separate from a chargeable diagnostic visit.
Heating & Gas Solutions
Boiler Repairs, Breakdowns & Heating Services
Professional boiler fault diagnostics and repairs, alongside servicing, system cleaning, installations and our full range of domestic heating and plumbing services.
Urgent Breakdown Assistance
Urgent Heating & Boiler Breakdowns
For urgent boiler breakdowns or loss of heating or hot water, call us to discuss the fault and our next available appointment. Same-day attendance may be available, depending on existing bookings.
Servicing & Internal Inspection
Boiler Servicing & Annual Maintenance
Annual boiler servicing, from routine maintenance to full strip-down servicing where required. We assess boiler condition, combustion readings and service history, following the manufacturer's instructions.
System Cleaning & Improved Circulation
Power Flushing & System Cleaning
We assess your heating system before recommending the most suitable cleaning method. Power flushing helps remove accumulated sludge and magnetite to improve circulation and heating performance. The results achievable depend on the condition of the system.
Boiler Installation & Upgrades
Boiler Installation & Replacement
Professional installation and replacement of A-rated combi, system and heat-only boilers, including boiler conversions and heating system upgrades. Manufacturer warranties available depending on the boiler selected.
Hot Water Cylinder Services
Unvented & Vented Hot Water Cylinders
G3-qualified installation, replacement, servicing and repair of vented and unvented hot water cylinders, including Megaflo systems, expansion vessels, safety controls and hot water faults.
Smart Heating Controls
Central Heating & Controls
Central heating installations, upgrades and repairs, including radiators, pipework, TRVs, motorised valves, S-plan zoning and smart heating controls from Hive, tado°, Drayton and Honeywell Home.
Digital CP12 Certificate
Landlord Gas Safety Certificates (CP12)
Your inspection findings are documented in a digital landlord gas safety record (CP12), which is emailed to you following completion of the inspection.
Plumbing & Leak Repairs
General Plumbing & Leaks
From burst pipes and water leaks to tap replacements, toilet cistern repairs, stopcocks, and general domestic plumbing repairs.
Professional & Reliable
Why Homeowners & Landlords Trust OnTime CMS
When you book with OnTime CMS, you deal directly with the engineer carrying out the work. We focus on reliable appointments, clear communication, tidy workmanship and doing the job properly.
Gas Safe Registered & Insured
Gas Safe registered for the domestic gas work we carry out, including boiler servicing, repairs, installations and landlord gas safety checks.
Reliable & Tidy Workmanship
We respect your home, use suitable floor protection where required and leave the work area clean and tidy.
Clear Upfront Pricing
Call-out and diagnostic charges are explained in advance. Any repair or additional work is priced and agreed before we proceed.
Gas Safe Registered
Registration No. 653502. Verified domestic gas specialist.
Registration Status:
Active & Verified
Gas Safe ID:
No. 653502
Checkatrade Rating:
9.94 / 10 (95 Reviews)
Workmanship:
12-Month Workmanship Guarantee
Verified Customer Satisfaction
Customer Reviews
Real feedback from homeowners and landlords in Bromley, Chislehurst, Greenwich, and surrounding south-east London communities.
★ ★ ★ ★ ★ 5.0
★ Google Review
"Pressure was down on our Boiler, Ontime CMS (Kem) very quickly deduced from a leak the issue was related to a pipe which was damaged by previous workers at the house. He traced the leak so quickly and efficiently (saving us large ceiling damage repair costs). He sorted the pipe and went on to sort out other issues in our central heating system - radiator by radiator. In two hours the leak was sorted, boiler pressure sorted and radiators sorted. It is worth noting that top end customers service we got from comms during the call out till the repairs were done."
★ ★ ★ ★ ★ 5.0
★ Google Review
"Kem was able to help us with our boiler when it stopped providing continuous hot water. He is very friendly, was quick to respond, able to not only fix the problem but also explain what had gone wrong - will definitely use him again to service our boiler going forward!"
★ ★ ★ ★ ★ 5.0
★ Google Review
"Just want to post up how helpful and uncomplicated our visit today was and our boiler now working well again."
★ ★ ★ ★ ★ 10.0
✓ Checkatrade
"[…] diagnosed the fault and exhausted all options before fitting a new PCB board. […]"
★ ★ ★ ★ ★ 10.0
✓ Checkatrade
"[…] He was polite and efficient, quickly identifying and resolving the problem. […]"
★ ★ ★ ★ ★ 10.0
✓ Checkatrade
"Kem is a genuine hero. Not only is he a lovely bloke, he also really knows his stuff. He came and promptly and professionally resolved a situation that was causing much stress to the family. I cannot rate him more highly. We are so grateful to him. Recommended. 10/10."
Recent Work
Recent Boiler Repairs & Heating Work
See genuine boiler diagnostic and repair work, alongside installations, servicing and system cleaning across Bromley, Chislehurst and surrounding areas.
Coverage
Areas We Cover Across BR, SE & Selected DA Postcodes
We cover Bromley, Chislehurst, Greenwich, Beckenham, Orpington, Bexley, Sidcup and surrounding areas across South East London and nearby Kent.
Bromley
BR1, BR2
Boiler installations, servicing, fault repairs, and plumbing work across Bromley.
Chislehurst
BR7
Boiler servicing, unvented hot water cylinders, and gas safety inspections in Chislehurst.
Greenwich
SE8, SE10
Heating and plumbing engineering across Greenwich, Deptford, and surrounding neighbourhoods.
Beckenham
BR3
Reliable local gas engineering for boiler servicing, heating repairs, and installations in Beckenham.
Orpington
BR5, BR6
Central heating maintenance, power flushing, and boiler repairs in Orpington.
West Wickham
BR4
Boiler replacements, cylinder maintenance, and heating repairs in West Wickham.
Petts Wood
BR5
Local boiler servicing, diagnostics, and radiator replacements across Petts Wood.
Bexley & Sidcup
DA5, DA14
Unvented cylinder servicing, radiator valve upgrades, and combi boiler installations.
Blackheath & Lewisham
SE3, SE13
Landlord CP12 safety certificates, boiler fault finding, and power flushing.
Welling & Crayford
DA16, DA1
Gas Safe registered heating maintenance and plumbing repairs in selected DA areas.
Don't see your specific postcode listed?
We frequently cover surrounding London and Kent neighbourhoods for boiler replacements and heating work.
Check Coverage: 020 3633 1122
Heating Advice
Frequently Asked Questions
Answers to common questions about boiler installations, repairs, servicing, gas safety and heating systems.
Subject to availability, we aim to offer same-day attendance for urgent boiler breakdowns in Bromley, Chislehurst and surrounding areas. If you have no heating or hot water, call us on 020 3633 1122 and we’ll advise on the next available appointment.
Yes. OnTime CMS is Gas Safe Registered (Registration No. 653502) and verified on Checkatrade with a 9.94/10 rating. We are qualified to install, service and repair leading boiler and cylinder makes including Worcester Bosch, Vaillant, Ideal, Baxi, and Viessmann.
Unvented cylinders connect directly to the cold mains water supply to deliver high-pressure hot water to showers and taps without requiring a cold water storage tank in the loft. They are well suited to family homes with multiple bathrooms.
Yes. We carry out annual gas safety inspections and issue digital CP12 certificates for landlords, letting agents and rental properties across BR, SE and selected DA postcodes.
If radiators have cold spots (especially at the bottom), take a long time to warm up, or the system makes unusual kettling noises, circulation may be restricted by magnetite sludge. A professional power flush helps clean the system, improve circulation and restore heating performance.