Installation manual

E-47
ENGLISH
DHW tank (Continued)
Troubleshooting
IMPORTANT: All maintenance or repair work must be executed by an approved installer.
Problem Possible cause Solution
Hot water is not coming out.
No power supply to the water heater
Check if there is any power on the power
supply terminal on the thermostat.
The thermostat may be set too high and
cause the fuse or safety cut-off to operate.
Reduce thermostat setting by 5°C and press
the reset button.
Heating is not working
Heating element or internal electrical wiring
is out of order.
Check if there is any power on the power
supply on the connector of the heating
element between black and yellow/green
wires. If this is OK, press the reset button on
the fuse/safety cut-off.
Water is not warm enough
Thermostat is set too low.
Adjust the thermostat up using a standard
screwdriver.
Heating element or the internal electrical
wiring is partially out of order.
Check the resistance of the heating element
on the connector of the heater bundle, and
the condition of the internal wiring.
UX mixing valve(fitted on top) is incorrectly
adjusted.
Adjust the UX mixing valve correctly to the
preferred temperature.
Safety valve(SV) is dripping.
Water expands when heated. If there is no
consumption of hot water over a period of
time pressure builds up, causing the safety
valve to open.
If drip from the SV is severe, it might need
to be replaced. Some dripping is normal.
Alternatively an expansion vessel can be
fitted.
Leak warning outlet is
dripping.
The heating element may not be properly
tightened.
Check the heating element o-ring seal and
all connections.
There may be a leak.
Other problems, or if none
of the above solves the
problem.
Contact the installer/supplier regarding any
other failure.
Before resetting the safety cut-off or altering the thermostat setting, always remember to isolate
the electrical supply to the unit. This must be done prior to removing the electrical box lid.
If the electric element or thermostat is defective, contact authorized electrician.
After adjustments are completed, ensure the lid to the electrical box is refitted correctly and that
the retaining screw is properly fitted.
Incorrect handling of thermostat, safety valve or other valves may lead to tank rupture. When servicing
the unit follow instructions carefully:
Always turn off main power supply when water supply is being shut off.
Test the free operation of the safety valve regularly by opening the valve ensuring the water flows freely.
Electrical connection and all servicing of the electrical components should only be carried out by an
authorized electrician.
Fitting and all servicing of plumbing fixtures should only be carried out by an authorized installer.
When replacing the thermostat, safety valve or any other valve or part supplied with this unit, use only
approved parts of the same specification.