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. (→ Page 29)
Water pressure sensor defect-
ive
▶ Replace the water pressure sensor.
Interruption in the cable harness ▶ Check the cable harness.
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