9 Fault Finding

Pump Overrun Operation For Fully Pumped System Only

The PCB has a timed pump overrun facility.The pump should run for several minutes after remote controls have stopped calling for heat.Before using the fault finding chart ensure all wiring is correct and in good condition, the pump is not faulty and check the PCB fuse F2 Does the pump run when SL is applied ?

YES

Faulty PCB. Replace Does pump continue to run afterSL is interrupted?

NOYES YES NO

Does pump stop after several minutes?

NO

System satisfactory.

FOR FULLY PUMPED OPEN VENTEDOR SEALED WATER SYSTEMS ONLY Diagram 9.3

29

221656D