Repair
Book Now

Detailed Description

We specialise in fast, reliable repairs for all types of Heat Interface Unit (HIU) faults. Whether your system has completely shut down or is showing early signs of trouble, our expert team is equipped to restore full performance efficiently. From diagnostics to part replacements, we handle every repair with technical precision and long-term reliability in mind.

Here’s a breakdown of what our HIU repair service typically involves:

01

No heating or hot water

Often caused by a faulty plate heat exchanger, diverter valve, or circulation pump.
02

Low pressure or visible leaks

It can be the result of expansion vessel issues, pipework damage, or system pressure loss.
03

Strange noises during operation

Typically linked to air in the system, a deteriorating pump, or limescale build-up in key components.
04

Inconsistent temperatures

May point to a faulty thermostat, damaged sensors, or a malfunctioning control board.
05

Poor heat output

This could be due to clogged filters, sludge accumulation, or system imbalance, which reduces flow efficiency

RSM has formed great relationships with all the major brands