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221834B
PUMP OVERRUN OPERATION
The control thermostat has a pump overrun facility built into it, when the control thermostat is
set at maximum only, the pump overrun will keep the pump running to allow the boiler to cool
down after which it will stop, providing the remote controls are NOT calling for heat.
FAULT FINDING
Turn boiler control thermostat to maximum, with the remote controls calling for heat, does the
pump continue to run after the appliance has shut down on boiler control thermostat ?
Turn off remote controls,
does pump stop after a short
period of time
Is there 240V~ on L ?
Is there 240V ~on
9 connection on thermostat ?
Faulty permanent
live feed.
Replace
Faulty pump overrun.
Replace control thermostat
Pump overrun in order
Is there 240V ~ on PL for pump ?
Faulty pump/wiring ? Replace
or repair as necessary
NO
YES
YES
YES
YES
YES
NO
NO
NO
NO
Faulty
connections
between
thermostat and
interconnection
PCB. Repair
Faulty
connections
between
thermostat and
interconnection
PCB. Repair
PM5
13 Fault Finding