E Fault Codes - Vaillant flexoTHERM exclusive VWF 57/4 Installation And Maintenance Instructions Manual

Status code Meaning
S.350 Heating rod: Safety cut-out open
S.351 Heating rod: Flow temp. too high
S.352 Heating rod: Pressure too low
S.353 Heating rod: Flow rate too low
S.354 Heating rod: Phase failure
E Fault codes
Note
In the event of rare faults which are caused by components in the refrigeration circuit, inform Customer Service.
Code Meaning
F.070 Invalid Device Specific Number
F.086 Building circuit: Lockout contact
S20 open
F.514 Temp. sensor fault: Compressor
inlet
F.517 Temp. sensor fault: Compressor
outlet
F.519 Sensor fault: Building circuit re-
turn temp.
F.520 Temp. sensor fault: Building cir-
cuit flow
F.532 Building circuit: Flow rate too low
F.546 Sensor fault: High pressure
F.583 Building circuit: Flow temp. too
low
F.685 Connection error: Control not de-
tected
F.701 Temp. sensor fault: Environ. cir-
cuit inlet
0020213395_00 flexoTHERM exclusive Installation and maintenance instructions
Cause
–
Replacing the control PCB and
display PCB
–
Contact S20 on heat pump mains
connection PCB (HMU) open
–
Incorrect setting of the limit thermo-
stat
–
Flow temperature sensor (heat
pump, gas-fired boiler, system
sensor) measures values that
deviate downwards
–
Sensor not connected or sensor in-
put has short-circuited
–
Sensor not connected or sensor in-
put has short-circuited
–
Sensor not connected or sensor in-
put has short-circuited
–
Sensor not connected or sensor in-
put has short-circuited
–
Stop cock was not opened
–
Building circuit pump defective
–
All consumers in the heating system
are closed
–
Flow rate is too low for recording
with the volume flow sensor
(< 120 l/h)
–
Sensor not connected or sensor in-
put has short-circuited
–
Four-way valve is mechanically
blocked
–
The temperature sensor in the flow is
defective
–
Air in the building circuit
–
System controller was previously de-
tected but the connection is broken
–
Sensor not connected or sensor in-
put has short-circuited
Appendix
Remedy
–
Setting the correct Device Specific
Number
–
Adjust the maximum flow temperat-
ure for the direct heating circuit via
the system controller (observe the
upper switch-off threshold for the
boilers)
–
Adjust the set value for the limit ther-
mostat
–
Check the sensor values
–
Check the sensor, and replace if
necessary
–
Replace the cable harness
–
Check the sensor, and replace if
necessary
–
Replace the cable harness
–
Check the sensor, and replace if
necessary
–
Replace the cable harness
–
Check the sensor, and replace if
necessary
–
Replace the cable harness
–
Check the stop cocks and thermo-
static radiator valves
–
Ensure that the flow rate is at least
35% of the nominal flow rate
–
Check that the building circuit pump
functions correctly
–
Check the sensor (e.g. using an in-
stallation aid), and replace if neces-
sary
–
Replace the cable harness
–
Check the building circuit flow rate
–
Check the quality of the plug contact
on the PCB and on the cable har-
ness
–
Check that the sensor is working
correctly (measure resistance using
sensor characteristic values)
–
Replace the sensor
–
Purging the building circuit
–
Check the eBUS connection to the
system controller
–
Check the sensor, and replace if
necessary
–
Replace the cable harness
43