Bosch Condens 2000 W - Page 16

16 | 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.