Worcester GREENSTAR HE combi Series, Installation And Servicing Instructions

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7 181 465 347 (01.07)
24
Rectifying faults
d 3
flashing.
Wrong signal from pin 8-9.
Check Action
1. Jumper 8 - 9 fitted correctly? yes:
↓
2.
no:
B
Power OFF the appliance.
B Fit jumper 8 - 9 correctly, tighten screw.
B
Turn ON the appliance.
d3?
↓
2.
2.
B
Turn ON the appliance.
B Measure voltage between Termi-
nal 4 and Terminal 8.
24 V DC?
yes:
↓
3.
no:
↓
5.
3. Heat store NTC sensor connected to
terminals 7, 8 and 9? yes:
B
Power OFF the appliance.
B Plug heat store NTC sensor connector into PCB
control board (303, page 46, Pos. 303). If lead
has no connector: replace heat store NTC sen-
sor.
B
Turn ON the appliance.
d3?
↓
4.
no:
↓
4.
4. Existing heat store thermostat con-
nected to Terminals 7, 8 and 9? yes:
B
Power OFF the appliance.
B Fix the additional bridge 8-9 in the right position
and close the screws.
B
Turn ON the appliance.
d3?
↓
5.
no:
↓
5.
5. The PCB control board is damaged.
B
Power OFF the appliance.
B Disconnect the boiler electrical connection.
B
Change PCB control board.
B Reconnect the boiler electrical connection.
B
Turn ON the appliance.