Hamworthy Boiler
Repairs London
Specialist Hamworthy engineers. Cascade systems, commercial plant rooms & luxury residences. Available 24/7, 365 days a year.
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Available 24/7. Gas Safe registered engineers.
4-hr Emergency Response
24/7, 365 days a year
Gas Safe Registered
All engineers fully certified
Hamworthy Specialists
Parts stocked on every van
Commercial Experts
Cascade & multi-boiler systems
Hamworthy boiler repairs London — at a glance
Hamworthy boiler repairs in London cost £150/hr + VAT with no separate call-out fee, and our Gas Safe commercial engineers typically reach you within 4 hours. We stock common Hamworthy parts on every van — including electrodes, gas valves and pump heads — so most commercial repairs are completed on the first visit. Cascade system diagnostics and lead/lag reconfiguration are included.
Quick Facts
- Suitable models
- Purewell Variheat, Evomax, Dorchester
- Typical repair time
- 2–4 hours (commercial)
- Standard rate
- £150/hr + VAT
- Emergency response
- 4 hours
- Parts availability
- Common parts on every van
- Warranty
- 12 months on all repairs
London's Hamworthy boiler specialists
RARE Plumbing & Heating are specialist engineers for Hamworthy boiler repairs, servicing and maintenance in London. Hamworthy equipment is found throughout the commercial and high-end residential sector — from managed apartment buildings in Kensington to boutique hotels in Mayfair. When these systems fail, you need engineers who know the brand, carry the parts, and can restore heating quickly and safely.
Hamworthy services we provide
Hamworthy models we work on
We have specialist knowledge across the full Hamworthy range.
Hamworthy fault codes & diagnostics
Common Hamworthy commercial boiler fault codes — updated with BMU display codes and E-series codes:
Flame Loss
The boiler detected a flame during operation but it has gone out — ionisation probe, gas valve, or draught issue.
Overheat Protection
The safety temperature limiter has tripped due to excessive heat — low water flow, pump failure, or blocked heat exchanger.
Low Water Pressure
System water pressure has dropped below the safe operating level — leak, failed expansion vessel, or PRV weeping.
Fan Fault
The combustion fan is not operating within expected parameters — fan motor failure, wiring fault, or PCB issue.
Temperature Limiter Lockout
Safety shutdown has occurred due to high temperatures. Manual reset required after fault investigation.
Water Pressure Switch Cut Out
Water pressure switch has cut out — system pressure too low or pressure switch failure.
Gas Pressure Switch
Safety shutdown triggered by gas pressure switch — insufficient gas supply pressure or gas pressure switch fault.
Ignition Failure
Safety time for establishing a flame was exceeded or ignition failed — gas supply, electrode, or gas valve fault.
Manually Locked Unit
The boiler has been manually locked out and requires physical reset by a qualified engineer after fault investigation.
Hamworthy commercial boilers require specialist diagnosis. Our engineers have extensive cascade system expertise. View full fault code database →
Commercial & cascade systems
Multi-boiler expertise for larger buildings.
Many of London's larger residential buildings and commercial properties use Hamworthy cascade systems — multiple boilers sequenced together to deliver high outputs efficiently. These require engineers with specific knowledge of cascade controller logic and lead/lag sequencing.
Our engineers can diagnose and repair individual boilers within a cascade without taking the whole system offline where possible — critical for properties where heating cannot be interrupted.
Call 020 7458 4949PPM maintenance contracts
Proactive care for your Hamworthy system.
Hamworthy boilers perform best under a structured annual maintenance programme. Our PPM contracts include full annual servicing, priority emergency response, detailed service reports, and compliance documentation. For property managers overseeing multiple buildings, we manage maintenance schedules across your entire portfolio.
View membership plansBook a Repair
24/7 emergency call-outs. Gas Safe registered. Hamworthy specialists.
020 7458 4949Book Online"Our Hamworthy cascade system failed overnight. RARE had an engineer on site by 7am and the system running before midday. Exceptional knowledge of the equipment."
Mark T. · Kensington
"We manage several properties with Hamworthy boilers. RARE are the only engineers we trust — they know these systems inside out."
Claire B. · Mayfair
"Professional, transparent and fast. They diagnosed a Dorchester fault code correctly first time and had the part on the van."
James R. · Belgravia
Clear rates — no call-out fee, no surprises
We charge a straightforward hourly rate with no separate charge for attending. The clock starts when the engineer arrives — not before. Any parts needed are quoted transparently before work begins, so you'll always know the cost upfront.
No call-out fee · Minimum 1 hour
Hamworthy repairs — complete topic guide
Boiler Repairs London
All-brand emergency repairs 24/7
Commercial Boiler Services
Commercial cascade specialists
Remeha Boiler Repairs
Quinta commercial specialists
ATAG Boiler Repairs
Commercial ATAG specialists
Combi Boiler Installation
New boiler supply and fit
System Boiler Installation
For larger properties
Plant Room Installation
Bespoke plant room design
Boiler Installation Costs
Full London pricing guide
Boiler Servicing
Annual Gas Safe service
PPM Membership
Planned maintenance plans
Boiler Error Codes
Full fault code database
Power Flushing
Restore heating efficiency
Hamworthy boiler questions answered
Everything you need to know before you call.
Related Services
Boiler Repairs London
All brands, 24/7 emergency response.
Commercial Boiler Services
Commercial cascade & plant room specialists.
Remeha Boiler Repairs
Quinta commercial boiler specialists.
ATAG Boiler Repairs
Commercial ATAG specialists across London.
Combi Boiler Installation
New boiler supply and fit from £3,200.
System Boiler Installation
For larger properties with multiple bathrooms.
Plant Room Installation
Bespoke plant room design & build.
Boiler Installation Costs
Full London pricing guide.
Power Flushing
Restore heating efficiency — remove sludge.
Reviewed by RARE Plumbing London Engineering Team
Gas Safe Registered Heating Engineers · Reviewed 30 August 2026