74
201703
Procedure
4.17.4
P4
Discharge pipe temperature sensor
connection on outdoor unit main PCB is
loose
1
Yes
Ensure the temperature sensor is
connected properly
No
Backup electric heater water outlet
temperature sensor connection,
domestic hot water tank temperature
sensor connection or water side heat
exchanger water outlet temperature
sensor connection on hydronic box main
PCB is loose
2
Yes
Ensure the temperature sensor is
connected properly
No
Temperature sensor has short-circuited
or failed
3
Yes
Replace the sensor
No
High pressure switch connection or
pressure sensor connection on outdoor
unit main PCB is loose
4
Yes
Ensure the pressure switch is connected
properly
No
Pressure sensor has short-circuited or
failed
5
Yes
Replace the pressure sensor
No
The high pressure side is blocked, caused
by crushed or bent pipe or blocked EXV
4
Yes
Inspect the system and fix the error
No
The condenser heat exchange is poor in
heating mode
5
Yes
Inspect the system and fix the error
No
The water flow rate is not sufficient in
cooling mode
6
Yes
Inspect the water system and fix the
error
No
Replace outdoor main PCB
Notes:
1.
Discharge pipe temperature sensor connection is port CN8 on the outdoor unit main PCBs (labeled 8 in Figure 4-2.1 and labelled 4 in Figures 4-2.3 and
MUNDOCLIMA AEROTHERM V17 - BIBLOC
