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FAULT FINDING AND DIAGNOSIS
Display
Cause
(Flashing)
Hot water outlet temperature
sensor not sensing expected
output temperature. (Status
message, not a fault code).
Primary fan rotation too slow
in operation.
No rotation sensor signal from
primary fan.
(Flashing)
Water flow signal exceeds
specified maximum value.
Water flow > 37 l/min.
Software/hardware failure.
Tab. 27
* By qualified registered gas engineer only.
52
Solution
1. Check that the sensor is firmly attached to the vertical
section of the hot water pipe.*
2. Clean the water filter, and any dirt in the taps and also the
water filters of the installation.
3. Check flue requirements are met. Long flue lengths, fluing
with more than three elbows, blocked flue gas pipes or cross
ventilation may cause this fault.
4. Check inlet gas pressure. Low gas pressure may prevent the
heater from reaching its required output temperature.*
5. Check supply voltage.
6. Possible defective control unit, call Technical Support.
7. Ensure the hot water sensor is not fitted on any bends in the
hot water pipe or incorrect redings causing an incorrect
reading.
1. Disconnect power supply and check wiring connections on
back of the fan and the two connectors on the control board.
2. Check supply voltage.
3. Check flue requirements are met. Long flue lengths, flueing
with more than three elbows, blocked flue pipes or cross
ventilation may cause this fault.
4. Ensure flue gas terminals maintain the required clearances
stated in this manual.
5. Check inlet gas pressure. Low gas pressure may cause the
fan to change its speed to meet its required temperature.*
6. Possible defective control unit, call Technical Support*.
1. Disconnect power supply and check wiring connections on
back of the fan and the two connectors on the control board.*
2. Check supply voltage.
3. Possible defective component in fan or defective control
unit, call the Technical Support*.
1. Disconnect power supply and check wiring connections on
the water valve and the two connectors on the control board.
2. Excessive water pressure and flow. Ensure water pressure is
less than 10 bar and flow rate is below 37 litres per minute.*
1. Disconnect power supply cord and check the live, neutral
and earth connections on control board as well as earth
connection on heater chassis.
2. Incorrect setting of control parameters can cause problems
with the water heater controller. Turn off the water heater.
Turn water heater back on and try resetting error code. Use the
reset button (
) to reset any error codes.
3. Possible defective control unit, call the Technical support.
6 720 646 322 (2012/05)
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