Kw Back-Up Heater At 230 V And At; 400 V - Vaillant VWL Series Operating Instructions Manual

Code Meaning
F.824 Building circuit 2: Pressure too
low
Note
Can only occur in conjunction with
an installed and activated intermedi-
ate heat exchanger set.
Fault refers to the outdoor unit's
brine pressure sensor.
F.825 Sensor fault: Capac. inlet temp.
F.1100 Immersion heater: Safety cut-out
open
F.1117 Compressor: Phase failure
F.1120 Immersion heater: Phase failure
F.9998 Connection fault: Heat pump
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
0
1
2
3
4
5
6
7
8
0020291544_01 Hydraulic Station Installation and maintenance instructions
Cause
–
Pressure loss in the building circuit
due to leakages or air pockets
–
Building circuit pressure sensor
defective
–
Refrigerant circuit temperature
sensor (vapour-forming) not con-
nected or the sensor input has short-
circuited
The safety cut-out on the electric back-
up heater is open due to:
–
Insufficient volume flow or air in the
building circuit
–
The immersion heater is operated
when the building circuit is not filled
–
Immersion heater operation at flow
temperatures above 98 °C trips the
safety fuse of the safety cut-out and
requires that the fuse be replaced
–
Feed-in of external heat into the
building circuit
–
Defective fuse
–
Incorrect electrical connections
–
Mains voltage too low
–
Compressor/low tariff power supply
not connected
–
Blocked by energy supply company
for over three hours
–
Electric back-up heater defective
–
Poorly tightened electrical connec-
tions
–
Mains voltage too low
–
eBUS cable not connected or con-
nected incorrectly
–
Outdoor unit without supply voltage
Power consumption
0.0 kW
0.7 kW
1.2 kW
1.8 kW
2.2 kW
3.2 kW
3.8 kW
4.7 kW
5.4 kW
Remedy
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
Set value
1 kW
2 kW
3 kW
4 kW
5 kW
6 kW
Appendix
Check the building circuit for leaks
Top up with 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
Check and, if required, replace the
sensor and cable
Check the circulation in the building
circuit pump
If required, open the stopcocks
Replace the safety cut-out
Reduce or stop the external heat
that is entering
Check that the dirt filter that is in
place is permeable
Check the fuse
Checking the electrical connections
Check the voltage at the heat pump
electrical connection
Reduce energy supply company
anti-cycling time to under three hours
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
Check the connection pipes between
the power supply PCB and control
PCB on the indoor and outdoor unit
57