60 Installation and maintenance instructions 0020244997_07
Code Meaning
S.46 Comfort protection: Min-
imum load, loss of flame
Comfort protection mode for flame loss at minimum load is activated.
S.53 Waiting time: Water
shortage
The product is within the waiting period of the modulation block/operating block function as a result of
a water deficiency (flow/return spread too large).
S.54 Waiting time: Water
shortage
Product is in the waiting period of the operation blocking function as a result of low water pressure
(temperature gradient).
S.57 Waiting time: Measuring
program
The product is within the waiting period as a result of the measuring programme.
S.58 Burner modulation limit-
ation
The burner modulation limitation is activated.
S.61 Fault: Incorrect gas type The coding resistor on the PCB does not match the entered gas group (see also F.92).
S.62 Adjust CO2 Set the CO
2
content.
S.63 Fault: Check gas route A fault message is activated. Check the gas route.
S.76 Service message: Check
water pressure
A service message is activated. Check the water pressure.
S.88 Purging programme is
running
The purge programme is activated.
S.92 Water circulation volume
self-test
The self-test for the water circulation volume is activated.
S.93 Flue gas measurement
not possible
Flue gas analysis is not currently possible.
S.96 Self-test: Return temper-
ature sensor
The self-test for the return temperature sensor is activated.
S.97 Water pressure sensor
self-test
The self-test for the water pressure sensor is activated.
S.98 Self-test: Flow/return
temperature sensor
The self-test for the flow/return temperature sensor is activated.
S.99 Vaillant self-test The Vaillant self-test is activated.
E Overview of 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
interruption
Flow temperature sensor de-
fective or not connected
▶ Check: Flow temperature sensor, plug, cable harness, PCB.
F.01 Return temperature sensor
interruption
Return temperature sensor de-
fective or not connected
▶ Check: Return temperature sensor, plug, cable harness, PCB.
F.02 Interruption: DHW outlet
sensor
Shift-load cylinder temperature
sensor defective or not connec-
ted
▶ On the shift-load cylinder, check (only in conjunction with
F.91): Plug, cable harness, temperature sensor.
F.03 Cylinder temperature
sensor interruption
Shift-load cylinder temperature
sensor defective or not connec-
ted
▶ On the shift-load cylinder, check (only in conjunction with
F.91): Temperature sensor plug, PCB plug, cable harness.
F.10 Flow temperature sensor
short circuit
Flow temperature sensor de-
fective or has short-circuited
▶ Check: NTC plug, cable harness, cable/housing, PCB, NTC
sensor.
F.11 Return temperature sensor
short circuit
Return temperature sensor de-
fective or has short-circuited
▶ Check: NTC plug, cable harness, housing, PCB, NTC sensor.
F.12 DHW outlet sensor short
circuit
Cylinder charging sensor de-
fective or has short-circuited
▶ Check (only in conjunction with F.91): NTC plug, cable har-
ness, NTC sensor, PCB.
F.13 Cylinder temperature
sensor short circuit
Warm-start sensor/cylinder tem-
perature sensor defective or not
connected
1. Check: NTC plug, earth connection, cable harness, NTC
sensor, PCB.
2. Check the following on the shift-load cylinder (in conjunction
with F.91): NTC plug, earth connection, cable harness, NTC
sensor, connection to the PCB.
F.20 Safety switch-off: Temper-
ature limiter
Maximum temperature at the
flow/return temperature sensor
is too high when the safety cut-
out function is operating using
the NTC
▶ Check: Flow temperature sensor (correct thermal connection),
cable harness, sufficient purging.
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