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Rectifying faults
29
6. Is the ground connection correct? yes: ↓7.
no: B Rewire correctly as specified in the installation
instructions.
B Press , does appliance restart???
EA? ↓7.
7. Two phase net:
Is there a resistor fitted between Pe
and N?
yes: ↓8.
no: B Power OFF the appliance.
B Disconnect the boiler electrical connection.
B Insert resistance (Order no. 8 900 431 516)
between the ground and the N connection.
B Reconnect the boiler electrical connection.
B Turn ON the appliance.
B Press , does appliance restart???
EA? ↓10.
8. Is condensation trap in condensing
boiler blocked?
yes: B Unscrew condensation trap and clean.
B Press , does appliance restart???
EA? ↓12.
no: ↓9.
9. Check the gas valve?
B Power OFF the appliance.
B Unplug the connectors from the
gas valve.
B Measure the gas valve coils I and
II electrical resistance.
R =164 ± 40 Ω?
yes: B Reconnect the gas valve.
B Turn ON the appliance.
B Press , does appliance restart???
EA? ↓10.
no: B Change the gas valve.
B Reconnect the gas valve.
B Turn ON the appliance.
B Press , does appliance restart???
EA? ↓10.
10. Is flue blocked?
B Check CO
2
level in combustion
air.
> 0,2 % CO
2
?
yes: B Check the flue.
B Press , does appliance restart???
EA? ↓11.
no: ↓11.
EA and flashing.
During operation: flame not detected
Check Action
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