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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)
11 Fault finding and diagnosis
11.1 Fault finding
To remove error code from the display,
press the reset button.
Display Cause Solution
Fault in the flue temperature sensor.
Temperature above 110 °C inside the
cabinet.
1. Check continuity of the flue temperature sensor (normaly
closed).*
2. Check for flue gas tightness around the top and bottom seals of
heat exchanger, use mirror to check around the rear as well as the
viewing window.
3. Check flue requirements are met. Long flue lengths, flueing with
more than three elbows, blocked flue gas pipe or cross ventilation
may cause this fault.
4. Check that flue temperature sensor connector and spade
connections are secure.*
5. Disconnect water heater from electrical supply and check the
wiring harness connections on the control board.
Flue gas temperature sensor - Fault
occurs if sensor is disconnected or in
short circuit or appliance selection in
“P7” mode is not correct.
1. Check flue gas temperature sensor connection ( Fig. 2, [9]).
2. Check sensor (< 100 ohm = short circuit).*
3. Check “P7” mode: The correct selection is “Cd”.*
Burner backflow temperature sensor
defect - fault occurs if sensor is
disconnected or in short circuit.
1. Check burner backflow temperature sensor connection (
Fig.
2, [13]).
2. Replace flue gas temperature sensor.*
Outlet temperature sensor fault
(Temperature below 0
°C or above
98
°C).
1. Check red wire connections at hot water temperature sensor.
Clean terminals. If badly corroded, replace sensor and wire
harness.*
2. Sensor may trip if water temperature drops below 0 °C to
protect heater from freezing conditions. Any damage caused by
freezing conditions is not covered by the warranty.
3. Clean the water filter, and any dirt in the taps and also the water
filters in the installation.
4. In areas where water has a high mineral content, periodic
descaling may be necessary.*
5. Check sensor.
Table 28
* By qualified registered gas engineer only.
… 54 …


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