HIU Repair London — Same-Day Heat Interface Unit Repairs
Lost hot water or heating? Collide Group provides same-day emergency HIU repair across Greater London. Our manufacturer-trained engineers carry the most common spares on the van, diagnosing and fixing the majority of HIU faults in a single visit.
When Your HIU Fails Everything Stops
A broken HIU means no hot water, no heating, and frustrated residents. General plumbers often can't diagnose HIU faults — they don't carry the right spares and aren't trained on the control systems. That's why you need an HIU specialist from the start.
- No hot water or heating
- Lukewarm water even at max setting
- Fault codes or error lights on display
- Leaks or dripping from the unit
- Banging, clicking or whistling noises
- Loss of pressure or flow
Specialist Diagnosis, First-Visit Fixes
We identify the exact fault, quote transparently, and fix it — usually on the first visit. No return trips, no guesswork.
- Faulty PICV valve diagnosis and replacement
- Blocked plate heat exchanger descale or swap
- Failed actuator replacement
- Diverter valve seal and cartridge repair
- Leaking union and connection fixes
- PCB control error diagnosis and reset
- Temperature sensor replacement
- Expansion vessel and PRV checks
Brands We Repair
Related HIU work in London: HIU Service London · HIU Installation London · Bulk Servicing London · HIU Powerflush London
The Benefits
Same-Day Response
Emergency callouts across Greater London — we aim to get to you the same day you call.
First-Visit Fix Rate
We carry the most common spares on the van so most HIU repairs are resolved in one visit.
Transparent Pricing
Callout from £120 — any additional parts or labour quoted before work proceeds.
“Collide diagnosed and repaired the HIU in under 60 minutes after two other contractors failed to find the fault. Residents were back on hot water the same day.”
— Block Manager, Wandsworth
HIU Repair from £120
Callout fee from £120 inc VAT. Any additional parts or labour will be quoted transparently before work begins. No hidden fees.
Book an Emergency RepairFrequently Asked Questions
How quickly can you respond to an HIU breakdown?
What does HIU repair cost?
What faults can you fix?
Do you carry parts on the van?
Related HIU Services
HIU Service
Annual servicing from £120 to prevent breakdowns.
Learn moreHIU Installation
New-build and replacement HIU installs, all brands.
Learn moreBulk Servicing
Block-wide service contracts for property managers.
Learn moreHIU Powerflush
Remove sludge and scale to restore HIU performance.
Learn moreHIU Broken? Call Us Now
Same-day emergency HIU repair across London. Specialist engineers, transparent pricing.