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Vaillant uniTOWER plus User Manual

Vaillant uniTOWER plus
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*****INTERNAL*****30 R_D proof- 26.10.2022 / 09:15:46- VaillantGroup\DOC-agt\Brand\VIH_QW_190_6\ENG\OI-II_GB_0020291525
56 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

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Vaillant uniTOWER plus Specifications

General IconGeneral
BrandVaillant
ModeluniTOWER plus
CategoryHeat Pump
LanguageEnglish

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