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FAULT FINDING/DIAGNOSTICS
FAULT DIAGNOSTICS
The control panel on the front of the appliance is provided
with 2 green indicator lights and a manual reset button.
(Green light)
(Green light)
(manual reset button)
These are provided to indicate the following:-
GREEN LIGHT NO.1
Will sense the water level within the F & E cistern and
will prevent the immersion heaters from being switched
‘ON’ when the unit is not full of water.
Green light No.1 will remain ‘ON’ to indicate that the
system is functioning correctly and is filled with water to
the correct level. If both Green lights 1 & 2 are ‘OFF’
check the water level in the F & E cistern. If the water
level is correct check the unit is switched ‘ON’.
GREEN LIGHT NO.2 & MANUAL RESET BUTTON
Will provide overheat protection to prevent the stored
water from boiling in the event of immersion heater
thermostat failure. Green light No.2 will remain ‘ON’ to
indicate that the system is functioning correctly. If Green
light No.2 is ‘OFF’ check the manual reset button on the
overheat thermostat. If the overheat button has popped
out check and replace as necessary the immersion heater
thermostats. The thermostats must be set at 77
0
C.
Manually press the reset button on the overheat
thermostat to reset the appliance.
FAULT CONDITION
DHW temperature remains cold exiting the taps.
DHW temperature fluctuates wildly when flow is
steady.
DHW temperature exceeds and remains well above
60
o
C when the flow rate is low.
POSSIBLE CAUSES
Thermal store is cold - DHW pump is stuck - DHW
temperature sensor or pump speed control PCB is
faulty - too little or too much flow from the pipe.
DHW pump keeps sticking when voltage is reduced
and not starting until voltage is too high.
DHW pump speed control PCB and/or temperature
sensor is/are faulty.
FAULT FINDING