HIU Repair London
No heating or hot water? Error code on the display? London-wide HIU repair by manufacturer-trained, in-house engineers. All major brands.
Emergency HIU repairs
When the heating goes off in a flat with an HIU, you don't want a generic plumber learning on the job. Our HIU vans carry common parts for all major brands, and we operate from a Battersea base so the typical London response time is around 60 minutes.
- 24/7 availability for emergency callouts
- ~60-minute London response time
- In-house Gas Safe engineers — no subcontractors
- Vans stocked for Danfoss, Alfa Laval, SAV, Evinox and more
How it works
Call us
Tell us the brand and any error code — we often diagnose on the call.
Diagnose on site
A trained HIU engineer attends and identifies the fault.
Fix on-site if possible
Most repairs complete in a single visit using van-stock parts.
Manufacturer parts + 12-month guarantee
Genuine parts where required. Workmanship guaranteed for 12 months.
Common HIU problems we fix
Recognise any of these? We diagnose and resolve them every week.
No hot water
Often a faulty heat exchanger, low flow rate or sensor issue.
Low water pressure
Blockage, failed pressure-reducing valve, or plate exchanger fault.
Error codes (E1, E2, E3…)
Specific brand-coded faults — tell us the code on the call and we can often diagnose remotely.
Unusual noises
Banging, whistling or humming usually points to air in the system or a failing pump.
Temperature fluctuations
Inconsistent heating from sensor recalibration or valve adjustment.
Leaking unit
Needs immediate attention. Often failed seals or corroded components.
Frequently Asked Questions
Error codes vary by brand. E1 typically means a sensor or temperature fault; E2 a flow issue; E3 a pressure issue. Tell us the brand and code when you call and we can often diagnose remotely before dispatching an engineer.
Related Services
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London's dedicated HIU specialists — servicing, repair, install and compliance.
HIU Servicing London
Annual HIU servicing by manufacturer-approved engineers. Fixed pricing.
HIU Installation London
New-build and replacement HIU installations. Developers, RMCs, individual flats.
Heat Network Compliance Support
Ofgem 2027 readiness for heat suppliers, block managers and developers.
HIU broken? Call now.
Same-day attendance across London. Fixed price before any work begins.
