8 x Faults and malfunctions
BA ROTEX HPSU compact 4 - 09/2013
47
9005 8F
Flow temperature
> 75 °C
Outlet water temperature
in HPSU compact > 75 °C
Discharge water temperature in HPSU compact is too high
(> 65 °C).
– Temperature sensor discharge water temperature
provides incorrect values.
– With installed backup heater: STB in backup heater (BUH)
has triggered.
9006 8H
Flow temperature
> 65 °C
Outlet water temperature
in HPSU compact > 65 °C
9007 A1
IG main board
defective
PCB A1P HPSU compact Malfunction message. Contact ROTEX heating technician.
9008 A5
Refrigerant
temperature
Refrigerant temperature
outside of the valid range
No heat consumption at underfloor heat exchanger
● Check flow.
● If the flow is OK, replace the refrigerant sensor.
9009 AA
STB fault
Optional: STB backup
heater (BOH)
STB in backup heater (BUH) has triggered.
● Check and unlock position of STL.
9010 AC Bridge on board A1P Bridge of connection socket "X21A" missing on the board A1P.
9011 C0 Fault flow sensor FlowSensor Flow sensor on HPSU compact is defective.
9012 C4 Fault flow sensor
Temperature sensor heat
exchanger
Temperature sensor heat exchanger of the HPSU compact is
defective.
9013 E1
AG main board
defective
PCB in the external heat
pump device
Malfunction message. Contact ROTEX heating technician.
9014 E3
Over-pressure
refrigerant
Pressure in refrigerant
system
Pressure in refrigerant system is too high. System must run within
its operating parameters.
9015 E4
Under-pressure
refrigerant
Low pressure sensor in
the external heat pump
device
Low pressure sensor in the external heat pump unit activated.
Check system for loss of refrigerant and if necessary check low
pressure sensor (short circuit).
9016 E5
Load protection
compressor
Overload protection refrig-
erant compressor
Overload protection refrigerant compressor triggered. System
must run within its operating parameters.
9017 E7 Fan blocked
Fan block in the external
heat pump unit
A fan in the external heat pump device is blocked. Check fan for
dirt affecting it, the fan may be defective.
9018 E9 Expansion valve
Electronic expansion
valve
The electronic expansion valve in the external heat pump unit is
defective.
9019 EC
Hot water tempera-
ture > 85 °C
Temperature in internal
hot water tank is too high
The temperature sensor in the hot water storage tank shows a
temperature value of >
85 °C. Check that the temperature
sensor is showing the correct value.
With installed backup heater: Transfer STB signal booster func-
tion faulty. Check connection. Check switching contactor backup
heater for short circuit.
9020 F3
Over-temperature
evaporator
The discharge tempera-
ture from the heat
exchanger of the external
heat pump unit is too high
The discharge temperature from the heat exchanger of the exter-
nal heat pump unit is too high due to a blockage. Remove possible
contamination on the heat exchanger. Contact ROTEX heating
technician if the fault signal persists.
9021 H3 HPS-System
Heat pump system
(only with 11-16 kW
system)
Internal fault in the heat pump system. Contact ROTEX heating
technician.
9022 H9 Fault AT sensor
External heat pump unit
temperature sensor
The external temperature sensor of the external heat pump unit is
defective.
9023 HC
Fault storage tank
sensor
Hot water storage tank
temperature sensor
Temperature sensor/connecting cable of storage tank sensor is
faulty.
9024 J1 Pressure sensor Pressure sensor
Malfunction message. Contact ROTEX heating technician.
9025 J3 Fault return sensor Thermistor discharge
9026 J5
Fault suction pipe
sensor
Temperature
sensor suction pipe
9027 J6
Aircoil sensor
defrost
Aircoil temperature sensor
9028 J7
Aircoil sensor
Temp.
Aircoil temperature sensor
9029 J8
Fault refrigerant
sensor AG
Temperature sensor liquid
line
The temperature sensor of the fluid line in the external heat pump
device is defective. Contact ROTEX heating technician.
Code Error message Component/Designation Fault and possible causes
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