Rotex RKHWMX300C Installation And Maintenance Instructions Manual page 58

8 x Errors, malfunctions and messages
Code Malfunction /
error message
Display Internal
E9048 EA 4-way valve
high pressure cool-
E9049 F6
ing
E9050 H0 Comfort Heating
compressor start-
E9052 H8
up
58
Component/
Designation
The following condition occurs for 10 min after operation for 5 min:
Heating: temperature of the condenser negative outlet water tem-
perature < -10 °C
4-way valve
The temperature measured by the temperature sensor on the fin
heat exchanger exceeds 60 °C
Temperature sensor on
the evaporator
Power supply condition malfunction detected before or directly after
the compressor starts up
Software
Compressor operating frequency below 55 Hz, voltage below 0.1 V
and input current below 0.5 A
Software
Causes and possible fault elimination
Check the thermistor for the outlet water in the heat exchanger.
Check the thermistor for the refrigerant fluid side.
Check whether the current flow LED flashes at regular intervals.
Check whether the correct replacement part has been installed.
Check whether the outer main conductor plate is receiving a
power supply.
Check the 4-way valve's coil/wiring harness.
Check the 4-way valve's body.
Check for insufficient refrigerant. Perform a leak test.
Check the quality of the refrigerant.
Check the shut-off valves.
Check whether the hydro printed circuit board is being supplied
with voltage.
Check whether the installation room meets the regulations.
Check the fan.
Check the fan motor's connection and wiring.
Check the expansion valve.
Check the outer inverter conductor plate.
Check whether the current flow LED flashes at regular intervals.
Check whether the correct replacement part has been installed.
Check whether the outer main conductor plate is receiving a
power supply.
Check the shut-off valves.
Check the heat exchanger.
Check the temperature sensor on the fin heat exchanger.
Check the quality of the refrigerant.
Check the compressor.
Check the compressor's connection and wiring.
Check the operation of the expansion valve (fluid return flow).
Check the refrigerant filling capacity, and check for leaks.
Check the outer inverter conductor plate.
Check whether the current flow LED flashes at regular intervals.
Check whether the correct replacement part has been installed.
Check whether the outer main conductor plate is receiving a
power supply.
Check the compressor.
Check the compressor's connection and wiring.
Check the operation of the expansion valve (fluid return flow).
Check the refrigerant filling capacity, and check for leaks.
Check whether the power supply meets the regulations. Check
for frequency fluctuations.
Check the outer inverter conductor plate.
Check whether the current flow LED flashes at regular intervals.
Check whether the correct replacement part has been installed.
FA ROTEX HPSU monobloc compact • 09/2017