Rotex HPSU compact (V5) Installation And Maintenance Manual page 62

Code Malfunction /
Error message
Display Internal
E9022 H9 Fault AT sensor
E9023 HC Fault DHW sensor
E9024 J1 Pressure sensor
E9025 J3 Fault T-return
Suction pipe sen-
E9026 J5
sor
Aircoil sensor
E9027 J6
Defrost
E9028 J7 Aircoil sensor temp
Fault cold sensor
E9029 J8
OU
FA ROTEX HPSU compact (V5) •
8
Component/Designation
External temperature sen-
sor R1T in the heat pump
exterior unit
Storage tank temperature
sensor t
DHW2
Pressure sensor S1NPH
in the heat pump exterior
unit
Discharge temperature
sensor R2T in the heat
pump exterior unit
Suction temperature sen-
sor R3T in the heat pump
exterior unit
Temperature sensor of the
lamella heat exchanger
R5T in the heat pump
exterior unit
Temperature sensor of the
lamella heat exchanger
R4T in the heat pump
exterior unit
(only in 11-16 kW
systems)
Temperature sensor liq-
uid-side R6T in the heat
pump exterior unit
x Errors, malfunctions and messages
Causes and possible error correction
Sensor or connection cable defective.
Check, replace.
63