Watermill ANHPC60DLV, Installation Instructions Manual, Page: 7 / 12

10. FAULT FINDING
If the pump doesn’t start, check the following.
1. Electricity supply and fuse (5 Amps rating)
2. Are isolating valves turned on?
3. Has pump run for a long time, causing thermal protection to turn off motor? Wait at
least 2 hours for cut-out to automatically reset.
4.
Sufficient water flow to operate the flow switches (0.5 litres per minute) or
approximately 10 inches head of water?
5.
Pump filters blocked – this can cause insufficient flow to pump – drain down hot and
cold water supply pipes, clean or replace filters as necessary.
6.
Is pump correctly installed with outlets (flowswitches) vertical?
Pump won’t turn of f
1. Is shower mixer valve fully off?
2. Is air entrapped in the shower system?
3. Is flow switch locked in the up (on) position with dirt or some other foreign matter?
Unstable water temperature/noisy pump?
A common cause of poor shower performance and control is air entering the pump, most
commonly from the hot water cylinder.
Air will cause erratic operation of the pump, noise and unstable shower water
temperature.
To reduce the effects of air in the hot water supply:
1. Reduce hot water temperature to 60˚C.
2. Ensure adequate feed to the pump. There should be at least a 2 metre lead (measured
from cold storage water level to input of pump) and all pump supply pipes should be with
22mm
gate valves.
3. Fit Surrey flange to ensure good air separation at hot water cylinder.
4. The hot water supply pipes should not have any high sections allowing air traps. If
necessary re-plumb hot water supply pipe, keeping as direct and short as possible.
5.
If it is not possible to control the temperature of the hot water a thermostatic blend
valve should be installed. The hot water feed from the cylinder to the pump is disconnected.
The blend valve is connected to both the hot water and cold water supply with the output
connected as the hot water feed to the pump. The thermostatic blend valve can then be
adjusted to ensure the correct 60˚C temperature.
Note: All plumbing work should conform to Water Supply (Water Fittings) Regulations
1999.
In this event turn off service valves, disconnect final connection to the pump, clean
filter, reconnect, turn on water supply.
3.
The flexible pump hoses can, dependent on water temperature and mechanical stress,
deteriorate with age. We recommend that all flexible hoses and connections are inspected at
least every 6 months. Replace as necessary to prevent leaks.
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