Appendix
0020213395_00 flexoTHERM exclusive Installation and maintenance instructions
43
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
Cause
Remedy
F.070
Invalid Device Specific Number
–
Replacing the control PCB and
display PCB
–
Setting the correct Device Specific
Number
F.086
Building circuit: Lockout contact
S20 open
–
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
–
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
F.514
Temp. sensor fault: Compressor
inlet
–
Sensor not connected or sensor in-
put has short-circuited
–
Check the sensor, and replace if
necessary
–
Replace the cable harness
F.517
Temp. sensor fault: Compressor
outlet
–
Sensor not connected or sensor in-
put has short-circuited
–
Check the sensor, and replace if
necessary
–
Replace the cable harness
F.519
Sensor fault: Building circuit re-
turn temp.
–
Sensor not connected or sensor in-
put has short-circuited
–
Check the sensor, and replace if
necessary
–
Replace the cable harness
F.520
Temp. sensor fault: Building cir-
cuit flow
–
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
–
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)
–
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
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
–
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 (measure resistance using
sensor characteristic values)
–
Replace the sensor
–
Purging the building circuit
F.685
Connection error: Control not de-
tected
–
System controller was previously de-
tected but the connection is broken
–
Check the eBUS connection to the
system controller
F.701
Temp. sensor fault: Environ. cir-
cuit inlet
–
Sensor not connected or sensor in-
put has short-circuited
–
Check the sensor, and replace if
necessary
–
Replace the cable harness
