16
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Failures / Errors
d7
and operating LED is flashing.
Appliance doesn’t modulate / Regulator valve problem (don’t regulate to max. position).
Control Step
Action
1.
Check if the regulator valve cable dam-
aged or not and the connection. Are the
connections wrong?
yes:
B
Change the cable harness or correct it.
B
Switch on the appliance.
d7 failure still exist ? -->2.
no:
-->2.
2.
Check the resistance from regulator valve.
B
Switch off the appliance.
B
Pull out the 20 poled connector on con-
trol unit.
B
Measure the resistance.
Is deviation of resistance values ?
yes:
B
Change the cable harness.
B
Switch on the appliance.
d7 failure still exist ? -->3.
no:
-->3.
3.
Check the resistance from regulator valve.
B
Voltage / current on reg. valve ?
B
Measure the resistance directly on gas
valve.
Is there deviation of resistance values
between two messurements ?
yes:
B
Change the gas valve.
B
Switch on the appliance.
d7 failure still exist ? -->4.
no:
-->4.
4.
Electronic card is defect.
B
Switch off the appliance.
B
Cut mains supply.
B
Change the electronic card.
B
Connect to main supply.
B
Switch on the appliance.
