ENGLISH-58
DHW tank
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-o 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-o.
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(tted 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 tted.
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.
Incorrect handling of thermostat, safety valve or other valves may lead to tank rupture. When servicing the unit
follow instructions carefully:
• Always turn o main power supply when water supply is being shut o.
• Test the free operation of the safety valve regularly by opening the valve ensuring the water ows 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 xtures 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 specication.
WARNING
• Before resetting the safety cut-o 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 retted correctly and that the retaining
screw is properly tted.
CAUTION
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