Low-Voltage Detection Or Over-Voltage Detection - Daikin E-Series Service Manual

SiENBE12-620

5.26 Low-voltage Detection or Over-voltage Detection

U2
remote control
Display
Outdoor Unit LED
A
Display
Method of
An abnormal voltage rise or drop is detected by checking the detection circuit or DC voltage
Malfunction
detection circuit.
Detection
Malfunction
Decision
Conditions
Supposed
Causes
Troubleshooting
Service Diagnosis
1 2 3 4
5 4 1 1
An over-voltage signal is fed from the over-voltage detection circuit to the microcomputer, or
the voltage being detected by the DC voltage detection circuit is judged to be below 150 V
for 0.1 second.
The system will be shut down if the error occurs 16 times.
Clearing condition: Continuous run for about 60 minutes (normal)
Supply voltage not as specified
Over-voltage detector or DC voltage detection circuit defective
PAM control part(s) defective
Be sure to turn off power switch before connect or disconnect connector,
Caution
or parts damage may be occurred.
Check the supply voltage.
Supply voltage as
specified?
YES
Turn on the
power again.
System restarted?
NO
Repeat a
couple of times.
4
NO
(Precaution before turning on the power again)
Make sure the power has been off for
at least 30 seconds.
YES
Troubleshooting
U2
Correct the power supply.
Replace the PM1.
(Replace the outdoor unit
PCB.)
(R5151)
249