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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