AP3/30_AP3/50_AP3/80_AP3/100_Instructions. V1.01
Page 14
August / 2012
Fault
Possible Cause
Solution
Over temperature
cut-out operates.
The thermostat has failed.
The thermostat is set at
too high a temperature.
Reset. If the cut-out operates again
isolate the unit and contact the installer.
Note: Isolate the electrical supply
before removing the electrical cover
panel and ensure that the panel is
correctly replaced and secured before
reconnecting.
Regular, intermittent
water discharge
from tundish.
Loss of pressure from the
expansion vessel.
Isolate the heating system and the
mains cold water supply. Partly drain
the unit. Recharge the expansion
vessel to the specified pressure and
re-commission.
Fault Finding
Note: All servicing and repairs must be undertaken by a competent person, familiar with
unvented systems.
11. The Zip Aquapoint is fitted with a sacrificial anode to provide additional protection against
corrosion. Gradual erosion of the sacrificial anode will occur depending upon local
conditions which in extreme cases may cause rapid erosion of the anode resulting
in particles being deposited as a residue. The Aquapoint should not, therefore, be used
in applications where water quality is critical. Regular preventive maintenance inspections
are vital to achieve optimum performance and durability of the appliance. The condition
of the anode should be checked regularly by an authorised Zip service provider as part of
the preventive maintenance programme.
Schedule
It is recommended that all key components of the heater should be inspected on a regular
basis, no greater than twelve monthly intervals, for continued safe and efficient operation. The
inspection should be carried out by a competent person familiar with unvented systems and
the components to be inspected should include the following:
1. Expansion relief valve. Check for correct operation.
2. T&P relief valve. Check for correct operation.
3. Check expansion vessel pressure – refer to label on vessel for correct pressure.
4. Inspect integral line strainer and clean as necessary.
5. Check that the discharge pipework is free of any obstructions.
6. Check that all electrical connections are tight.
7. Check condition of the sacrificial anode by disconnecting the wire between the anode and
vessel and verifying that the current between anode and vessel exceeds 0.1mA ensuring
that the wire is re-connected afterwards. If the current between anode and vessel does
not exceed 0.1mA the anode should be checked visually and replaced if necessary.
