Stuart Turner PH 35 ES B - Manual (Page 18)

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Cont ...
Dry Run Protection
This pump is fitted with a safety control circuit, which will detect the following fault
condition:

Dry running caused by water starvation to the pump.
Should the pump run out of water it will stop as part of a “protective logic sequence”,
detailed below.
The fault should be rectified before re-starting the pump. Check that there is sufficient
water supply to the pump and also ensure that all terminal fitting outlets are closed.
Protective Logic Sequence
If water starvation occurs and the power supply to the pump remains uninterrupted, the
pump controller will perform the following protective sequence.
1. If the pump detects water starvation, it will stop operation after a 1 minute period.
2. The pump will remain in the off condition for a period of 5 minutes.
3. The pump will then re-start and if the water starvation condition remains present, the
pump will then stop operation after a 1 minute period.
4. The pump will remain in the off condition for a period of 5 minutes.
5. The pump will then re-start and if the water starvation condition remains present, the
pump will then stop operation after a 1 minute period.
6. The pump will remain in the off condition for a period of 5 minutes.
7. The pump will then re-start and if the water starvation condition remains present, the
pump will then stop operation after a 1 minute period.
8. After three consecutive resets are performed the pump will remain in the off
condition indefinitely.
9. To restart the pump, the power supply should be first isolated for a period of at least
10 seconds before switching on again.
If the pump fails to operate normally after three attempts to re-start, then please contact
the PumpAssist team on 0844 98 000 97.
Fault Finding
The PCB is also fitted with a “power on” indicator light. This will remain illuminated when
mains power is supplied to the board.
The indicator light is located on the PCB within the terminal box.
 This operation should only be carried out by a competent person
To view the light the following procedure must be followed:-
 Isolate the mains electrical power supply from the pump.
 Remove the four screws retaining the terminal box lid (Fig. 14).
 Lift the terminal box lid off.
 IMPORTANT – Ensure there is no contact with any of the internal parts of the terminal
box.