8 Troubleshooting – Possible faults
171
F020
Please empty ash
box!
•
For information only
•
Acknowledge with the
Enter
button
F021
Temp. acc. top
short circuit
•
Short circuit in the sensor or
sensor cable
•
Connect sensor
•
Replace cable
•
Check terminal (check plug
for secure fit)
•
Exchange the faulty sensor
(plug on the I/O circuit board)
with a different sensor
•
If a different fault appears, the
sensor should be replaced
•
If the same fault appears, the
I/O circuit board should be
replaced
F022
Temp. acc. top
open circuit
•
Sensor is faulty
•
Open circuit in sensor cable
•
Sensor not connected
•
Connect sensor
•
Replace cable
•
Check terminal (check plug
for secure fit)
•
Exchange the faulty sensor
(plug on the I/O circuit board)
with a different sensor
•
If a different fault appears, the
sensor should be replaced
•
If the same fault appears, the
I/O circuit board should be
replaced
F023
Temp. acc. bot-
tom short cir-
cuit
•
Short circuit in the sensor or
sensor cable
•
Connect sensor
•
Replace cable
•
Check terminal (check plug
for secure fit)
•
Exchange the faulty sensor
(plug on the I/O circuit board)
with a different sensor
•
If a different fault appears, the
sensor should be replaced
•
If the same fault appears, the
I/O circuit board should be
replaced
No.
Fault
Cause
Remedy
Table 8/1 - Faults
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