Appendix
48
Installation and maintenance instructions flexoTHERM exclusive 0020213394_01
Status code
Meaning
S.352
Heating rod: Pressure too low
S.353
Heating rod: Flow rate too low
S.354
Heating rod: Phase failure
G
Maintenance messages
Code
Meaning
Cause
Remedy
M.32
Building circuit: Pressure low
–
Pressure loss in the building circuit
due to leaks or air pockets
–
Building circuit pressure sensor is
defective
–
Check the building circuit for leaks,
top up with heating water and purge
–
Check the plug contact on the PCB
and on the cable harness; check
that the pressure sensor is working
correctly and, if required, replace the
pressure sensor
M.33
Only with
the heat
source:
Air
Fan unit: Cleaning required
–
Air inlet or air outlet of the air/brine
heat exchanger contaminated
–
The fan unit is de-iced more fre-
quently than is required. The effi-
ciency of the heat pump is reduced.
Loosen and clean any dirt from the
fan unit (air/brine heat exchanger)
M.34
Environment circuit: Pressure low
–
Pressure loss in the environment
circuit due to leaks or air pockets
–
Environment circuit pressure sensor
defective
–
Check the environment circuit
for leaks, top up with medium
(brine/water), and purge
–
Check the plug contact on the PCB
and on the cable harness; check
that the pressure sensor is working
correctly and, if required, replace the
pressure sensor
M.49
Only with
the heat
source:
Air
Environment circuit: Brine lines
inverted
–
Check that the connections are
correctly assigned to the brine lines
H
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.514
Temp. sensor fault: Compressor
inlet
–
Sensor not connected or sensor
input 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
input 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
input 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
input 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
–
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
