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Worcester-Bosch GREENSPRING CWi47 Manual

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Fault finding and diagnosis
GREENSPRING CWi47 – 6 720 646 322 (2015/04)
(Flashing) Hot water outlet temperature sensor not
sensing expected output temperature.
(Status message, not a fault code).
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, flueing 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 readings causing an incorrect reading.
Primary fan rotation too slow in
operation.
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*.
No rotation sensor signal from primary
fan.
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*.
(Flashing) Water flow signal exceeds specified
maximum value.
Water flow > 37 l/min.
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.*
Software/hardware failure. 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.
Display Cause Solution
Table 28
* By qualified registered gas engineer only.
… 55 …


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