Mitsubishi Heavy Industries FDTC40ZHXV Technical Manual page 333

E48
1. Applicable model
Model SRC 40 – 60
2. Error detection method
Detected by rotation speed of
outdoor fan motor
3. Condition of Error displayed
When actual rotation speed
of outdoor fan motor drops to
-1
75min or lower for 30 minutes
continuously, the compressor
and the outdoor fan motor stop.
After 3-minutes delay, it starts
again automatically, but if this
anomaly occurs 5 times within
60 minutes after the initial
detection.
4. Presumable cause
• Defective outdoor control
PCB
• Foreign material at rotational
area of fan propeller
• Defective fan motor
• Dust on control PCB
• Blown F3 fuse
Note: When E48 error occurs, in almost cases F3 fuse (1A) on the outdoor control PCB is blown. There are a lot of cases that fuse is blown and E48
occurs due to defective fan motor. And even though only the outdoor control PCB ( or fuse) is replaced,, another trouble (*1) could occur.
Therefore when fuse is blown, check whether the fan motor is OK or not.
After confirming the fan motor normal, check by power ON. (Don't power ON without confirming the fan motor normal.)
*1 The error which does not seem to relate E48 may occur like as "
communication error (E45) and etc.
Keeps flashing Stays Off
–
Keeps flashing
5. Troubleshooting
Diagnosis
311
–
Outdoor DC fan motor error
(Model SRC40 - 60)
", Stay OFF of LED on outdoor control PCB, inverter
–
Countermeasure
Remove foreign matter.
Replace fan motor.
If resistance between
(Vm):red - (GND):blue is
detected 1kΩ or lower, it is
faulty.
Check power supply
voltage.
Replace faulty fan motor
and control PCB.
Replace fan motor (If
anomaly persists after
replacing fan motor,
replace control PCB.)
Malfunction by temporary
noise