E Overview Of Fault Codes - Vaillant ecoTEC plus VU 6/5-5 Series Installation And Maintenance Instructions Manual

Code
S.46 Comfort protection: Min-
imum load, loss of flame
S.53 Waiting time: Water
shortage
S.54 Waiting time: Water
shortage
S.57 Waiting time: Measuring
program
S.58 Burner modulation limit-
ation
S.61 Fault: Incorrect gas type
S.62 Adjust CO2
S.63 Fault: Check gas route
S.76 Service message: Check
water pressure
S.88 Purging programme is
running
S.92 Water circulation volume
self-test
S.93 Flue gas measurement
not possible
S.96 Self-test: Return temper-
ature sensor
S.97 Water pressure sensor
self-test
S.98 Self-test: Flow/return
temperature sensor
S.99 Vaillant self-test
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
F.00 Flow temperature sensor
interruption
F.01 Return temperature sensor
interruption
F.02 Interruption: DHW outlet
sensor
F.03 Cylinder temperature
sensor interruption
F.10 Flow temperature sensor
short circuit
F.11 Return temperature sensor
short circuit
F.12 DHW outlet sensor short
circuit
F.13 Cylinder temperature
sensor short circuit
F.20 Safety switch-off: Temper-
ature limiter
60
Meaning
Comfort protection mode for flame loss at minimum load is activated.
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).
Product is in the waiting period of the operation blocking function as a result of low water pressure
(temperature gradient).
The product is within the waiting period as a result of the measuring programme.
The burner modulation limitation is activated.
The coding resistor on the PCB does not match the entered gas group (see also F.92).
Set the CO content.
2
A fault message is activated. Check the gas route.
A service message is activated. Check the water pressure.
The purge programme is activated.
The self-test for the water circulation volume is activated.
Flue gas analysis is not currently possible.
The self-test for the return temperature sensor is activated.
The self-test for the water pressure sensor is activated.
The self-test for the flow/return temperature sensor is activated.
The Vaillant self-test is activated.
Possible cause
Flow temperature sensor de-
fective or not connected
Return temperature sensor de-
fective or not connected
Shift-load cylinder temperature
sensor defective or not connec-
ted
Shift-load cylinder temperature
sensor defective or not connec-
ted
Flow temperature sensor de-
fective or has short-circuited
Return temperature sensor de-
fective or has short-circuited
Cylinder charging sensor de-
fective or has short-circuited
Warm-start sensor/cylinder tem-
perature sensor defective or not
connected
Maximum temperature at the
flow/return temperature sensor
is too high when the safety cut-
out function is operating using
the NTC
Measure
▶
Check: Flow temperature sensor, plug, cable harness, PCB.
▶
Check: Return temperature sensor, plug, cable harness, PCB.
▶
On the shift-load cylinder, check (only in conjunction with
F.91): Plug, cable harness, temperature sensor.
▶
On the shift-load cylinder, check (only in conjunction with
F.91): Temperature sensor plug, PCB plug, cable harness.
▶
Check: NTC plug, cable harness, cable/housing, PCB, NTC
sensor.
▶
Check: NTC plug, cable harness, housing, PCB, NTC sensor.
▶
Check (only in conjunction with F.91): NTC plug, cable har-
ness, NTC sensor, PCB.
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.
▶
Check: Flow temperature sensor (correct thermal connection),
cable harness, sufficient purging.
Installation and maintenance instructions 0020244997_07