After the stopping of the system, the flashing time of the LED02 is the malfunction
code.
For example： Malfunction N.O 4
2.5sec 2.5sec
1# Ambient sensors circuit break.
2# Hot temperature sensor circuit breaks or shorts.
3# Outlet temperature sensor circuit breaks or shorts.
4# DC compressor feedback.
5# Outdoor system communication malfunction.
6# Current overcharge.
7# No load.
8# Overloaded/ under loaded voltage.
9# DC compressor failure.
10# Refrigerating overload.
11# Defrosting mode.
12# IPM protection.
13# E
2
ROM reading failure.
14# E
2
ROM coining failure.
16# NO AC power.
17# Aspiration sensor circuit breaks.
19# DC compressor speed control failure.
21# Coil 1 sensor circuit breaks or shorts.
22# Coil 2 sensor circuit breaks or shorts.
31# System A communication malfunction.
32# System B communication malfunction.
Dealing with the malfunctions
4# Compressor feedback malfunction: Check the main board CN301 and the module jack CN3.
Check the CN04 on the main board and test the output of 15V DC current between the pins
of CN04. Check the location of the chip COM01 at the back of the mainborad, to see if
there is any circuit shorts. Check the states of the 3 phases of the modules. If the feedbacks
of all the checks and tests are normal, then replace COM01.
5# Outdoor system communication malfunction: check the module jack CN401 on the
main board, to see if the conducts of the jack are normally connected with
the terminal stripe. Test if there is a 5V DC current between the pin 8 and
pin 16 of IC03 on the main board. Check if the pin 3 and pin 13 of this chip
are correctly connected with the pin 44 and pin 45 of the IC01, to test if
there is any circuit shorts. Test if there is any communication wave output
at the pin 4 of PQ 404 and PQ 408 and at the pin 2 of PQ403 and PQ 407 and
if there is any circuit shorts on the systems of the surrounding devices ( the
misconnect between the live line and the zero line.)
6#. Current overcharge: Test if there is any circuit block on the system. Test the 4 diodes
Air Conditioner
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