Rotex HPSU compact 304 Instruction Manual page 48

8 x Faults and malfunctions
Code Error message
Display Internal
9030 L4
9031 L5
9032 L8 Electrical fault
9033 L9
9034 LC
9035 P1 Board defective
9036 P4 Electrical fault
9037 PJ Output setting
9038 U0 Refrigerant leak
Under/ over 
9039 U2
voltage
9040 U3 Screed function
9041 U4
9042 U5
Transmission error
9043 U7
9044 UA
E75 — —
E76 — —
E81 — —
E88 — —
E91 — —
E128 — —
E129 — —
E200 — —
E8005 — —
E9000 — —
W8006 — —
W8007 — —
Tab. 8-2 Error codes on the main control unit of HPSU compact
48
Component/Designation
Electrical components
Electrical components
Electrical components
Electrical components
Electrical components
PCB in the external heat
pump device
Electrical components
Incorrect capacity setting
Refrigerant loss
Main circuit without power Malfunction message. Contact ROTEX heating technician.
Screed function active
Communication fault
Communication fault
Communication fault
Communication fault
Outside temperature sen-
sor
Domestic hot water tem-
perature sensor
Circuit board RoCon BM1 Parameter store in EEPROM faulty.
Circuit board RoCon BM1 Parameter store in external flash memory faulty.
Connected CAN modules Bus detection of a CAN module doubly present.
Temperature sensor
Pressure sensor
Communication fault
Water pressure heating
network too low
Temporary internal mes-
sage
Heating network
Water pressure heating
network too high
Fault and possible causes
Malfunction message. Contact ROTEX heating technician.
There is too little or no refrigerant left in the system. Check system
for leaks, repair and refill.
No fault.
Malfunction message. Contact ROTEX heating technician.
Outside temperature sensor defective.
Domestic hot water temperature sensor defective.
Temperature sensor in flow sensor defective.
Pressure sensor defective.
The Modbus communication between the operating section BM1
and main board A1P is disrupted. Check cabling, check RTXAL4
board.
Water pressure has fallen below the minimum permissible value.
If this message is shown for a longer period of time, contact the
ROTEX Service Team.
Maximum permissible pressure drop exceeded.
Water pressure has exceeded the maximum permissible value.
BA ROTEX HPSU compact 4 - 09/2013