Buderus Logamax plus Service Manual page 19

Gas wallhung boiler
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3A
is flashing.
Fan sensor not detected.
(This failure only occurs if there is a sensor or the cable physical defect)
Control Step
1.
Is th fan cables damaged ?
2.
Is there any problem at fan sensor
and cable ?
B Switch off the appliance.
B Check the sensor and cable.
3.
Electronic card is defect.
GB012 - 25K
Action
yes:
B Switch off the appliance.
B Change the cables.
B Switch on the appliance.
3A failure still exist ? -->2.
no:
-->2.
yes:
B Change the cable and sensor.
B Switch on the appliance.
3A failure still exist ? -->3.
no:
-->3.
B Switch off the appliance.
B Cut mains supply.
B Change the electronic card.
B Connect to main supply.
B Switch on the appliance.
Failures / Errors
3
19

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