Appendix
44
Installation and maintenance instructions flexoTHERM exclusive 0020213395_00
Code
Meaning
Cause
Remedy
F.702
Temp. sensor fault: Environment
cir. out
–
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: Building cir. pres-
sure
–
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: Enviro. cir. 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: Display not de-
tected
–
Cable not connected or connected
incorrectly
Operator control panel display de-
fective
–
Check the connection line between
the mains connection PCB and the
display
–
Replace the display
F.710
Environment circuit: Outlet tem-
perature 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 (measure resistance 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
F.714
Environment circuit: Pressure too
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 the medium (brine/water),
purge
–
Check the quality of the plug contact
on the PCB and on the cable har-
ness
–
Check that the pressure sensor is
working correctly
–
Replace the pressure sensor
F.715
Env. circuit: Fault contact: Pump
open
–
The electronics system of the high-
efficiency pump has detected a fault
(e. g. dry running, blockage, over-
voltage, undervoltage) and switched
the pump off as a securing measure.
–
Switch the heat pump off for at least
30 seconds (no current)
–
Check the quality of the plug contact
on the PCB
–
Check that the pump functions cor-
rectly
–
Purging the environment circuit
F.718
Fan unit 1: Fan blocked
–
There is no confirmation signal stat-
ing that the fan is rotating
–
Check the air route and, if required,
remove any blockages
–
Check and, if required, replace the
F1 fuse on the PCB in the fan unit
(OMU)
F.719
Fan unit 1: Safety cut-out open
–
The safety cut-out on the de-icer is
open due to insufficient volume flow
and/or brine temperatures above
70 °C
–
When operating the de-icer outside
of the permitted area of application
–
De-icer operation when the brine
circuit is not filled
–
De-icer operation at brine tem-
peratures above 120 °C trips the
fuse of the safety cut-out and re-
quires that the fuse be replaced
–
Check for circulation in the environ-
ment circuit pump
–
If required, open the stop cock
The safety cut-out is automatically reset
as soon as the temperature at the fuse
falls below 55 °C again.
If the safety cut-out is still open at a de-
icer temperature below 55 °C, temper-
atures above 120 °C were reached and
the fuse tripped.
–
Check and, if required, replace the
F1 fuse of the air/brine collector
–
Replace the safety cut-out
