Appendix
0020291544_01 Hydraulic Station Installation and maintenance instructions
57
Code
Meaning
Cause
Remedy
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.
–
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 cable har-
ness
–
Check that the pressure sensor is
working correctly
–
Replace the pressure sensor
F.825
Sensor fault: Capac. inlet temp.
–
Refrigerant circuit temperature
sensor (vapour-forming) not con-
nected or the sensor input has short-
circuited
–
Check and, if required, replace the
sensor and cable
F.1100
Immersion heater: Safety cut-out
open
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
–
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
F.1117
Compressor: Phase failure
–
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
–
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
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
