*****INTERNAL*****30 R_D proof- 26.10.2022 / 09:15:46- VaillantGroup\DOC-agt\Brand\VIH_QW_190_6\ENG\OI-II_GB_0020291525
0020291525_04 Installation and maintenance instructions 61
Code Meaning Cause
Remedy
F.1120 Immersion heater: Phase failure – Electric back-up heater defective
– Poorly tightened electrical connec-
tions
– Mains voltage too low
– Check the electric back-up heater
and its power supply
– Check the electrical connections
– Measure the voltage at the electrical
connection for the electric back-up
heater
F.9998 Connection fault: Heat pump –
eBUS cable not connected or con-
nected incorrectly
– Outdoor unit without supply voltage
–
Check the connection pipes between
the power supply PCB and control
PCB on the indoor and outdoor unit
K 5.4 kW back-up heater at 230 V and at 400 V
Internal control of the output
levels at 230 V and at 400 V
Power consumption Set value
0 0.0 kW
1 0.7 kW 1 kW
2 1.2 kW
3 1.8 kW 2 kW
4 2.2 kW 3 kW
5 3.2 kW
6 3.8 kW 4 kW
7 4.7 kW 5 kW
8 5.4 kW 6 kW
L Inspection and maintenance work
# Maintenance work Interval
1 Checking the pre-charge pressure of the expansion vessel Annually
43
2 Cleaning the domestic hot water cylinder If required, at least every
2 years
3 Check that the prioritising diverter valve can move easily (visually/audibly) Annually
4 Checking the electronics boxes, removing dust from the ventilation slits Annually
M Characteristic values for the internal temperature sensors, hydraulic circuit
Sensors: TT620 TT650
Temperature (°C) Resistance (ohms)
0 33400
5 25902
10 20247
15 15950
20 12657
25 10115
30 8138
35 6589
40 5367
45 4398
50 3624
55 3002
60 2500
65 2092
70 1759
75 1486
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