Stuart Turner Techflo QT 50TNH - Manual (Page 18)

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8.11 Dry Run Protection: This pump is fitted with a PCB that will detect the following
fault:
Dry running caused by water starvation to the pump.
The water starvation must be rectified before re-starting the pump. Check that
there is a sufficient water supply to the pump and also ensure that all terminal
fitting outlets are closed.
8.12 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 approximately
20
seconds.
2) If a gravity flow of water exists through the pump, this will restart the pump
when the water supply is re-established.
3) If no gravity flow of water exists; to restart the pump, the power supply should
be first isolated for a period of at least 10 seconds before switching on again.
4) Important. Once the water supply has been re-established to the pump, the
priming/starting procedure as detailed in Section 5.13 must be repeated to
ensure the pump is fully primed.
Note:- Twin pumps will only detect water starvation if the water supply is lost to
both ends of the pump simultaneously.
8.13 Environment Protection: Your appliance contains valuable materials which can
be recovered or recycled.
At the end of the products’ useful life, please leave it at an appropriate local civic
waste collection point.