| Complaint | Cause | Solution |
|---|---|---|
| Leakage | ||
| Note: Close all valves on the plumbing bracket under HIU and the mains water valve. | ||
| Weeping from connection | Coupling nut is loose / Gasket missing | |
| Tighten union nut / Insert gasket |
| | Weeping from temperature sensor | O-ring is missing/ O-ring damaged | Replace temperature sensor | |
Differential pressure control valve leaks
| Connection nipple (s) loose | Tighten connection nipple (s) | |
Differential pressure control valve damaged
| | Replace valve | | Other components or pipes leak | Component or pipe damage | Replace component or pipe | | Central Heating System does not heat | | Radiators are not warm | Valves on plumbing bracket closed | Open valves on the plumbing bracket | | | Radiator valves closed | Open radiator valves | | | Air in heating pipe | Bleed air from heating system | | | Tap is open | Close tap | | | Filter blocked | Clean filter | | |
Pressure and / or temperature of district heating network does not conform with demand
|
Check pressure and / or temperature of district heating distribution network
| | |
Possible defect in temperature sensor or heating valve
| Contact Engineer | | No Domestic Hot Water | | No water | No water pressure |
Check / open main valve Check flow limiter for proper placement and / or blockages
| | Domestic Hot Water is not at the right temperature | | Water is not hot | Pre-payment and / or return valves closed |
Purchase energy and / or open return valve on heat distribution network
| | | Low flow rate,1 lt / min is not being achieved |
Open the tap to achieve at least 2 lt / min and / or open valves fully
| | | Flow Sensor defect |
Replace flow sensor
| | |
Pressure and / or temperature of district heating network does not conform with demand
| Check pressure and / or temperature of district heating distribution network | | | Filter blocked | Clean filter | | |
Possible defect in temperature sensor or heating valve
| Contact Engineer |
| Insulation Cover will not close | ||
| Cover does not close properly | Cables caught between sheathing | Make sure cables are in slots provided and keep cables free of the insulating jacket |
| Pipe spacer is not seated correctly in the slot | Press pipe spacer into slot fully | |
| Heat meter hitting against the inside of case | Check correct installation dimensions and adjust position as required | |
| Sound | ||
| NOTE: It is normal that the HIU makes noise when hot water or heating are active. | ||
| Rattling sound | Flow sensor incorrectly installed | Flow Sensor correct installation (up arrow) |
| Other Sound | Contact Engineer |