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29
221504A
YES
NO
Turn off remote controls, does
the pump stop after a short
period of time
NO
YES
Is there 240V~ on 11 ?
Pump overrun in order.
NO
NO
NO
Faulty pump / wiring ? Replace
or repair as necessary.
YES
Is there 240V~ on 9
connection on thermostat?
YES
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?
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.
Diagram 13.4
YES
Faulty permanent live feed.
Replace.
Faulty Pump overrun.
Replace Control
Thermostat
Faulty connections between
thermostat and main terminal strip.
Repair.
Is there 240V~ on 9 for
pump?
Faulty internal wiring between
main terminal strip and
thermostat. Repair.
13 Fault Finding
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