
0020313973_01 Compact Installation and maintenance instructions
47
Code
Meaning
S.76
A service message is activated. Check the water pressure.
S.88
The purge programme is active.
S.91
The exhibition mode is activated.
S.96
The self-test for the return temperature sensor is activated. Heat demands are blocked.
S.98
The self-test for the flow/return temperature sensor is activated. Heat demands are blocked.
D
Fault codes
Note
Since the code table is used for various products, some codes may not be visible for the product in question.
Code/meaning
Possible cause
Measure
F.00
Flow temperature sensor inter-
ruption
Plug for flow temperature
sensor loose/not plugged in
▶
Check the plug and the plug connection for the flow temperat-
ure sensor.
Flow temperature sensor de-
fective
▶
Replace the flow temperature sensor.
Multiple plug loose/not plugged
in
▶
Check the multiple plug and plug connection.
Interruption in the cable harness
▶
Check the cable harness.
F.01
Return temperature sensor in-
terruption
Plug for return temperature
sensor loose/not plugged in
▶
Check the plug and the plug connection for the return temper-
ature sensor.
Return temperature sensor de-
fective
▶
Replace the return temperature sensor.
Multiple plug loose/not plugged
in
▶
Check the multiple plug and plug connection.
Interruption in the cable harness
▶
Check the cable harness.
F.10
Flow temperature sensor short
circuit
Flow temperature sensor de-
fective
▶
Replace the flow temperature sensor.
Short circuit in the cable har-
ness
▶
Check the cable harness.
Flow temperature sensor cable
defective
▶
Check the flow temperature sensor cable.
F.11
Return temperature sensor
short circuit
Return temperature sensor de-
fective
▶
Replace the return temperature sensor.
Short circuit in the cable har-
ness
▶
Check the cable harness.
Return temperature sensor
cable defective
▶
Check the return temperature sensor cable.
F.13
Cylinder temperature sensor
short circuit
Cylinder temperature sensor
defective
▶
Replace the cylinder temperature sensor.
Short circuit in the cable har-
ness
▶
Check the cable harness.
Short circuit in the connection
cable
▶
Check the connection cable and, if required, replace it.
F.20
Temperature cut-out safety
shutdown
Flow temperature sensor de-
fective
▶
Replace the flow temperature sensor.
Return temperature sensor de-
fective
▶
Replace the return temperature sensor.
Earth connection faulty
▶
Check the earth connection.
Black discharge via the ignition
cable, ignition plug or ignition
electrode
▶
Check the ignition cable, ignition plug and ignition electrode.
F.22
System pressure too low
Insufficient/no water in the
product.
▶
Fill the heating installation. (
Water pressure sensor defect-
ive
▶
Replace the water pressure sensor.
Interruption in the cable harness
▶
Check the cable harness.