17
INSTALLATION INSTRUCTIONS & USER MANUAL
210005 V2.00 AUG 2017 - ZIP APIII/5-15(OB)
TECHNICAL SUPPORT
TEL: 0345 6 005 005 EMAIL: SERVICE@ZIPINDUSTRIES .CO.UK
WWW.ZIPWATER.CO.UK
FAULT
POSSIBLE CAUSE
SOLUTION
Over temperature cut-
out
operates.
The thermostat has failed.
Reset and if the cut-out operates
again, isolate the unit and contact
the installer.
NB. Isolate the electrical supply
before removing the cover and
ensure that the cover is correctly
replaced and secured before
reconnecting.
The thermostat is set at too
high a temperature.
Regular,intermittent
water discharge from
the 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.
Thermostat failure.
Isolate the heating system and
check the thermal controls when
discharge ceases. Replace the
thermostat if faulty.
Continuous water dis-
charge from tundish.
Pressure reducing valve
not operating correctly.
Check with pressure gauge and
replace as necessary.
T&P relief valve not operat-
ing correctly.
Check and replace if faulty.
Expansion relief valve
not operating correctly.
Check and replace if faulty.
No water flow from hot
taps.
Cold water mains is
isolated.
Check and switch on.
Integral line strainer in
pressure reducing valve is
blocked.
Check and clean as necessary.
Pressure reducing valve
is incorrectly fitted.
Refit correctly with arrows in the
direction of flow.
Water from hot taps is
cold.
Power supply not switched
on
Check and switch on.
Over temperature cut-out
has operated.
See fault ‘Over temperature cut-
out operates’ above.
Faulty element.
Check and replace as necessary.
Thermostat failure.
Check and replace as necessary.
FAULT FINDING
