*****INTERNAL*****30 R_D proof- 26.10.2022 / 09:15:46- VaillantGroup\DOC-agt\Brand\VIH_QW_190_6\ENG\OI-II_GB_0020291525
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Installation and maintenance instructions 0020291525_04
H
Maintenance messages
Code
Meaning
Cause
Remedy
M.23
Status external current anode
–
External current anode not recog-
nised
–
If required, check for a cable break
M.32
Building circuit: Waterpress. Low
–
Pressure loss in the building circuit
due to leakages 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 wiring harness; check
that the pressure sensor is working
correctly and, if required, replace the
pressure sensor
M.200
Building circuit : Brine pressure
low
–
Pressure loss in the building circuit
due to leakages 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 wiring harness; check
that the pressure sensor is working
correctly and, if required, replace the
pressure sensor
M.201
Sensor fault: Cylinder temperature
–
Cylinder temperature sensor defect-
ive
–
Check the plug contact on the PCB
and on the wiring harness; check
that the sensor is working correctly
and, if required, replace the sensor
M.202
Sensor fault: System temperature
–
System temperature sensor defective
–
Check the plug contact on the PCB
and on the wiring harness; check
that the sensor is working correctly
and, if required, replace the sensor
M.203
Connection fault: Disp. not recog-
nised
–
Display defective
–
Display not connected
–
Check the quality of the plug contact
on the PCB and on the wiring har-
ness
–
Replace the display, if required
I
Comfort protection mode
Code
Meaning
Description
Remedy
200
Sensor fault: Temp. air inlet
Still possible to operate with existing,
functional outdoor temperature sensor
Replace the air inlet sensor
J
Fault codes
Code
Meaning
Cause
Remedy
F.022
Building circuit: Water press. too
low
–
Pressure loss in the building circuit
due to leakages or air pockets
–
Building circuit pressure sensor
defective
–
Check the building circuit for leaks
–
Top up with water, purge
–
Check the quality of the plug contact
on the PCB and on the wiring har-
ness
–
Check that the pressure sensor is
working correctly
–
Replace the pressure sensor
F.042
Fault: Coding resistor
–
Coding resistor damaged or not set
–
Check that the coding resistor is
positioned correctly and, if required,
replace it.
F.073
Sensor fault: Building circ. water
pressure
–
The sensor is not connected or the
sensor input has short-circuited
–
Check and, if required, replace the
sensor
–
Replace the wiring harness
F.094
Fault: Vortex
–
Volume flow sensor not connected or
sensor input has short-circuited
–
Check and, if required, replace the
sensor
–
Replace the wiring harness
F.103
Fault: Spare part ident.
–
Incorrect control PCB installed on
the outdoor unit
–
Installing the correct PCB
F.514
Sensor fault: Compr. inlet temp.
–
The sensor is not connected or the
sensor input has short-circuited
–
Check and, if required, replace the
sensor
–
Replace the wiring harness
