Vaillant flexoTHERM exclusive VWF 57/4 230V, Installation And Maintenance Instructions Manual

Page: 46 / 72

46
Installation and maintenance instructions 0020213395_04
Code Meaning Cause
Remedy
F.520 Sensor fault: Building circuit flow
temp.
–
Sensor not connected or sensor in-
put has short-circuited
–
Check the sensor, and replace if
necessary
–
Replace the cable harness
F.532 Building circuit: Flow rate too low
–
Stopcock 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)
–
Thermostatic valve(s) defective
–
No bypass valve available in sys-
tems without a buffer
–
Bypass valve incorrectly set or de-
fective
–
Air in the heat pump
–
Pump has insufficient output or is
defective
–
Condenser is dirty
–
Existing dirt filter clogged
–
Check the stopcocks, thermostatic
valves, bypass valve and dirt filter
–
Ensure that the flow rate is at least
35% of the nominal flow rate
–
Check that the building circuit pump
functions correctly
–
Purging the building circuit
F.546 Sensor fault: High pressure
–
Sensor not connected or sensor in-
put has short-circuited
–
Check the sensor (e.g. using an in-
stallation aid), and replace if neces-
sary
–
Replace the cable harness
F.583 Building circuit: Flow temp. too
low
–
4-port valve is mechanically blocked
–
Temperature sensor in the flow is
defective
–
Air in the building circuit
–
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 (resistance measurement
using sensor characteristic values)
–
Replace the sensor
–
Purging the building circuit
F.685 Connection error: Contr. not re-
cognised
–
System control was previously detec-
ted but the connection is broken
–
Check the eBUS connection to the
system control
F.701 Sensor fault: Env. circuit inlet
temp.
–
Sensor not connected or sensor in-
put has short-circuited
–
Check the sensor, and replace if
necessary
–
Replace the cable harness
F.702 Sensor fault: Env. circuit outlet
temp.
–
Sensor not connected or sensor in-
put has short-circuited
–
Check the sensor, and replace if
necessary
–
Replace the cable harness
F.703 Sensor fault: Low pressure
–
Sensor not connected or sensor in-
put has short-circuited
–
Check the sensor, and replace if
necessary
–
Replace the cable harness
F.704 Sensor fault: Build. circ. pressure
–
Sensor not connected or sensor in-
put has short-circuited
–
Check the sensor, and replace if
necessary
–
Replace the cable harness
F.705 Sensor fault: Env. circuit pressure
–
Sensor not connected or sensor in-
put has short-circuited
–
Check the sensor, and replace if
necessary
–
Replace the cable harness
F.707 Connection error: Disp. not recog-
nised
–
Cable not connected or connected
incorrectly
Control panel display defective
–
Check the connection cable between
the main PCB and the display
–
Replace the display