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24
Rectifying faults
Error d3
d3 flashing.
Wrong signal from pin 8-9.
Check Action
1. B Measure voltage between Termi-
nal 4 and Terminal 8.
Voltage ≅ 24 V DC?
yes: ↓2.
no: ↓3.
2. Link between terminals 8 and 9 con-
nected?
yes: B Power OFF the appliance.
B Check link across 8-9 properly fitted, tighten
screws properly.
B Turn ON the appliance.
d3? ↓3.
no: ↓3.
3. Terminal block defective. 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.
4. The PCB control board is damaged. 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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