Worcester GREENSTAR HE combi Series, Installation And Servicing Instructions

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7 181 465 347 (01.07)
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