Vaillant flexoTHERM exclusive VWF 117/4 Installation And Maintenance Instructions Manual page 53

Code Meaning
F.797 Sensor fault: Cooling flow temp.
F.798 Sensor fault: Well inlet temp.
F.799 Sensor fault: Well outlet temp.
F.1100 Heating rod: Safety cut-out open
F.1117 Compressor: Phase failure
F.1118 Compressor: Incorrect phase seq.
F.1119 Compressor: ICL fault
F.1120 Heating rod: Phase failure
0020213394_01 flexoTHERM exclusive Installation and maintenance instructions
Cause
–
Sensor not connected or sensor
input has short-circuited
–
Sensor not connected or sensor
input has short-circuited
–
Sensor not connected or sensor
input has short-circuited
The safety cut-out on the auxiliary elec-
tric heater is open due to:
–
Insufficient volume flow or air in the
building circuit
–
Heating rod operation when the
building circuit is not filled
–
Heating rod operation at flow tem-
peratures above 110 °C trips the
fuse of the safety cut-out and re-
quires that the fuse be replaced
–
Feeding of external heat into the
building circuit
–
In-rush current limiter defective or
incorrectly connected
–
Defective fuse
–
Poorly tightened electrical connec-
tions
–
Mains voltage too low
–
Compressor/low tariff power supply
not connected
–
Blocked by energy supply company
for over three hours
–
Incorrect order of phase connection
to the mains supply
–
In-rush current limiter defective or
incorrectly connected
–
In-rush current limiter defective or
incorrectly connected
–
Mains voltage too low
–
The circuit breaker in the electronics
box has been triggered
–
Auxiliary electric heater defective
–
Poorly tightened electrical connec-
tions
–
Mains voltage too low
–
Blocked by energy supply company
for over three hours
Appendix
Remedy
–
Check the sensor, and replace if
necessary
–
Replace the cable harness
–
Check the sensor, and replace if
necessary
–
Replace the cable harness
–
Check the sensor, and replace if
necessary
–
Replace the cable harness
–
Check the circulation in the building
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.
Also press .
reset
If the safety cut-out is still open at an
auxiliary electric heater temperature
below 55 °C, temperatures above
110 °C were reached and the fuse
tripped.
–
Replace the safety cut-out
–
Reduce or stop the external heat
that is entering
–
Check the fuse
–
Check the electrical connections
–
Measure voltage at the heat pump
electrical connection
–
Reduce energy supply company
anti-cycling time to under three hours
–
Change the phase order by switch-
ing over two phases at a time on the
mains supply
–
Check the in-rush current limiter
–
Check all plug contacts
–
Check the ICL compressor connec-
tion
–
Check the ICL controller PCB con-
nection
–
Replace the ICL
–
Check the auxiliary electric heater
and its power supply, and reset the
circuit breaker
–
Check the electrical connections
–
Measure the voltage at the electrical
connection for the auxiliary electric
heater
53