8
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Faults and malfunctions
107
FA ROTEX HeatPumpSolarUnit - Part 2 - 05/2009
Tab. 8-3
Fault codes on the user interface of the indoor module (RKHB) for the ROTEX HeatPumpSolarUnit
E7
Fan blocked Outdoor Module (RRHQ)
A fan in the Outdoor Module (RRHQ) is blocked. Check fan for dirt affecting it, the fan may be defec-
tive.
E9
Electronic expansion valve
The electronic expansion valve on the Outdoor Module (RRHQ) is defective.
EC
Temperature hot water storage tank too
high
The temperature sensor in the hot water storage tank shows a temperature value of >89 °C.
Check that the temperature sensor is showing the correct value. In the Booster Heater (EHS), check
the contactor concerned for a short circuit.
F3
Discharge temperature at heat exchanger
Outdoor Module (RRHQ) too high
The discharge temperature at the heat exchanger of the Outdoor Module (RRHQ) is getting too high
due to a blockage. Remove any possible contamination from the heat exchanger of the Outdoor Mod-
ule (RRHQ). If the fault signal persists, contact a ROTEX service engineer.
H3
Heat pump system
(only with 11-16 kW system)
Internal fault in the heat pump system. Contact ROTEX service engineer.
H9
Temperature sensor Outdoor Module
(RRHQ)
Outside temperature sensor on the Outdoor Module (RRHQ) is defective.
HC
Hot water storage tank temperature sen-
sor
Temperature sensor or connecting cable of temperature sensor for the hot water storage tank is
defective.
J1
Pressure sensor
Malfunction message. Contact ROTEX service engineer.
J3
Thermistor discharge
J5
Temperature sensor suction pipe
J6
Aircoil temperature sensor
J7
Aircoil temperature sensor
J8
Temperature sensor liquid line
Temperature sensor of liquid line in the Outdoor Module (RRHQ) is defective. Contact ROTEX serv-
ice engineer.
L4
Electrical components
Malfunction message. Contact ROTEX service engineer.
L5
Electrical components
L8
Electrical components
L9
Electrical components
LC
Electrical components
P1
Conductor board for Outdoor Module
(RRHQ)
P4
Electrical components
PJ
Incorrect capacity setting
U0
Refrigerant loss
There is too little or no refrigerant left in the system. Check system for leaks, repair and refill.
U2
Main circuit without power
Malfunction message. Contact ROTEX service engineer.
U4
Communication fault
U5
Communication fault
U7
Communication fault
UA
Communication fault
Fault code
Component/Designation
Fault and possible causes
