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Appendix
48
Installation and maintenance instructions flexoTHERM exclusive 0020196687_03
Code
Meaning
Cause
Remedy
F.520
Sensor fault: Building circuit flow
temp.
–
Sensor not connected or sensor
input 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
–
Check the stopcocks and thermo-
static valves
–
Ensure that the flow rate is at least
35% of the nominal flow rate
–
Check that the building circuit pump
functions correctly
F.546
Sensor fault: High pressure
–
Sensor not connected or sensor
input 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
–
Four-way valve is mechanically
blocked
–
The 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
input 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
input 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
input 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
input 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
input has short-circuited
–
Check the sensor, and replace if
necessary
–
Replace the cable harness
F.708
Connection error: Fan unit 1:
–
No electrical connection
No eBUS connection
–
Check the electrical connection to
fan unit 1 (check the line connection;
contact fault? Has the circuit breaker
tripped in the connection box?)
–
Check the eBUS connection to fan
unit 1
–
Check the address switch position
on the PCB of fan unit 1. Required
switch position: 1
F.710
Env. circuit: Outlet temp. too low
–
Environment circuit pump defective
–
Temperature sensor for environment
circuit outlet defective
–
Volume flow too low in the environ-
ment circuit
–
Air in the environment circuit
–
Check the flow rate in the environ-
ment circuit
–
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
–
Check the volume flow of the en-
vironment circuit pump (optimum
spread of 3 K)
–
Purging the environment circuit