The Digital Water
Switching Unit has
gone into “loss of
prime” (no water
is being delivered
to pump).
* Only applicable if
application is using a
digital water switch.
The pump has failed
to prime, no water
is being detected.
The system may have a large pipe
network to charge and the pump is
running high flow with no pressure.
1. Close the isolating valve on the
discharge line to almost 90% closed.
2. Restart to ensure the pump has head
pressure and fills the line slowly.
The valve on or
between tank and
switching unit inlet
may be closed.
You will need to reprime the pump
and reset the water switch.
1. Open the isolation valve on the suction line.
2. Bleed air from system while the suction
line is connected to the pump.
a) Above ground tank: Remove
priming plug on pump casing. Allow
water to flow through via gravity
until all air has been expelled.
b) Below ground tank: Ensure foot
valve is installed, fill up suction line
and casing from discharge point.
3. Activate all appliances/outlets
sequentially from the nearest to the
furthest outlet. Repeat if necessary.
4. Reset the switching unit.
Refer to page 16 for more information
on priming the pump.
The mesh filter in
the water switching
unit is blocked.
1. Switch off power to the unit.
2. Isolate the water lines and remove
the pump barrel union.
3. Inspect/clean/replace the
switching unit mesh filter.
51
SYMPTOM
CAUSE
SOLUTION
