Friedrich MD24Y3J Svc Manual page 76

Display
Title
code
Sensor error of high
43
pressure
Is pressure sensor OK?
(Check the value of
pressure sensor.
Cf. Output voltage is about
1.4V at 1500kPa)
Yes
Is sensor connected
to PCB correctly?
Yes
After replacement of outdoor
unit main PCB is the system
also abnormal?
Yes
Replace corresponding
pressure sensor
Display
Title
code
51 Over capacity
Only for training and service purposes
Cause of error
Abnormal value of sensor
(Open/Short)
No
Replace the pressure sensor
No
Connect sensor to PCB correctly
No
END
Cause of error
• Over capacity Combination
- 76 -
Check point & Normal condition
• Bad connection of connector PCB
• Bad connection high pressure connector
• Defect of high pressure connector (Open/Short)
• Defect of connector PCB (Open/Short)
• Defect of outdoor main PCB.
Check point & Normal condition
• Check the indoor unit capacity.
• Check the combination table.