Table: MECH Advanced Troubleshooting

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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