13 Fault Finding

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 ?

 

NO

 

NO

Faulty permanent

YES

 

 

Is there 240V~ on

L

?

live feed.

 

 

 

 

 

Replace

 

 

Turn off remote controls,

 

 

does pump stop after a short

 

 

 

 

 

 

 

 

 

 

 

 

period of time

 

NO

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Faulty pump overrun.

 

YES

 

 

Replace control thermostat

YES

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Pump overrun in order

Is there 240V ~on

NO

 

9 connection on thermostat ?

 

 

Faulty

 

connections

YES

between

thermostat and

 

interconnection

 

PCB. Repair

 

NO

Is there 240V ~ on PL for pump ?

 

 

Faulty

YES

connections

between

 

 

thermostat and

 

interconnection

 

PCB. Repair

Faulty pump/wiring ? Replace

 

or repair as necessary

 

PM5

27

221834B

Page 27
Image 27
Glowworm Lighting 40 manual Pump Overrun Operation

40 specifications

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