Technical library / on-site diagnosis
THE FAULT IS NOT ALWAYS WHERE THE SYMPTOM APPEARS.
HIU and CIU symptoms cross electrical, hydraulic and control boundaries. Safe, conclusive diagnosis requires measured conditions and engineering attendance at the property.
Book an engineer visitWhy attendance is required
Remote assumptions lead to unnecessary replacement.
Temperature, pressure, flow, electrical supply and control demand must be observed at the system. Do not remove covers or attempt live electrical or hydraulic work. Request technical support so an engineer can test the complete interface.
Request technical supportNo hot water
Primary temperatures, differential pressure and DHW control response must be measured at the unit.
Book engineering attendance TECH / 02No heating
Demand, pump operation and secondary circulation require testing together on site.
Book engineering attendance TECH / 03Hot water fluctuating
Dynamic readings under draw-off are needed to separate flow, valve and exchanger faults.
Book engineering attendance TECH / 04Pump not working
Electrical command, control mode and hydraulic load require competent verification.
Book engineering attendance TECH / 05High return temperature
Return performance must be assessed under load across both sides of the interface.
Book engineering attendance TECH / 06Low delta T
Measured flow, temperatures, bypass and valve authority are needed before remediation.
Book engineering attendance TECH / 07Apartment cooling
CIU controls, water temperatures and condensation protection require on-site checks.
Book engineering attendance