Worcester ZWBR 7-30 R 30 HE PLUS COMBI Service Booklet page 24

Rectifying faults
Error d3
d3
flashing.
Wrong signal from pin 8-9.
Check
B Measure voltage between Termi-
1.
nal 4 and Terminal 8.
Voltage ≅ 24 V DC?
2. Link between terminals 8 and 9 con-
nected?
3. Terminal block defective.
4. The PCB control board is damaged.
24
Supplied By www.heating spares.co Tel. 0161 620 6677
Action
↓2.
yes:
↓3.
no:
B Power OFF the appliance.
yes:
B Check link across 8-9 properly fitted, tighten
screws properly.
B Turn ON the appliance.
d3? ↓3.
↓3.
no:
B Power OFF the appliance.
B Disconnect the boiler electrical connection.
B Replace terminal strip.
B Reconnect the boiler electrical connection.
B Turn ON the appliance.
d3? ↓4.
B Make a note of the altered service function set-
tings (see table 1 on page 7) in order to keep the
altered values.
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.
B Restore service settings previously noted down.
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