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Pump Overrun Operation For Fully Pumped System Only
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
FOR FULLY PUMPED OPEN VENTED
OR SEALED WATER SYSTEMS ONLY
9 Fault Finding
The PCB has a timed pump overrun facility.
Does the pump run when SL is applied ?
YES
Does pump continue to run after
SL is interrupted?
YES
Does pump stop after several
minutes?
YES
System satisfactory.
29
NO
Faulty PCB. Replace
NO
NO
Diagram 9.3
221656D
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