83
4. Cylinder temperature sensor
(gas system boiler):
■
Disconnect plug % from the con-
trol unit cable harness.
■ Check the sensor resistance and
compare it to the curve.
■ In the event of severe deviation
replace the sensor.
Checking the fuse
1. Switch OFF the power supply.
2. Open the control unit enclosure.
3. Check fuse F1. See page 87.
Danger
Incorrect or improperly fitted
fuses can lead to an
increased risk of fire.
■ Insert fuses without using
any force. Position fuses
correctly.
■ Only use structurally iden-
tical types with the speci-
fied response characteris-
tics.
Troubleshooting
Repairs
(cont.)
5837146
Service
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