Fault Finding & Diagnosis of Heat Interface Units (HIUs) – Star Boiler Repair
At Star Boiler Repair, we specialize in fault finding and diagnosis of Heat Interface Units (HIUs), ensuring your heating and hot water system operates efficiently. Whether you’re experiencing low heat output, inconsistent hot water, or complete system failure, our expert engineers provide fast, accurate, and reliable troubleshooting to restore your system to peak performance.
Common HIU Issues We Diagnose
1. No Heating or Hot Water
• Faulty heat exchanger or blocked plate
• Airlocks in the system
• Circulation pump failure
• Insufficient primary flow from the central plant
2. Poor Hot Water Pressure
• Limescale build-up in the plate heat exchanger
• Strainer or filter blockages
• Issues with the pressure regulating valve
3. Temperature Fluctuations
• Faulty thermostatic control valve
• Incorrect sensor readings
• Primary supply temperature issues
4. Leaks or Drips from the HIU
• Worn-out seals or gaskets
• Pressure relief valve (PRV) failure
• Corrosion in pipework or fittings
5. HIU Making Unusual Noises
• Air trapped in the system
• Pump or valve malfunction
• Blocked heat exchanger leading to cavitation
If your Heat Interface Unit is underperforming, don’t wait for a complete failure. Contact Star Boiler Repair today for expert HIU fault-finding and diagnosis!
