AUX ASW-H09B5B4/FAR3DI-C3, Service Manual

Page: 45 / 101

42
(12) F3- Compressor out-of-step error
Explanation of
error
Cause: The module panel will constantly test the current of lead wires
of the compressor and calculate the position of the rotator of the
compressor when driving the compressor to work. When the
compressor deviates far from the normal operating status , it will
indicate “compressor out-of-step error” because the current of the
compressor wires is too high or it cannot detect the position of the
rotator. This error always follows “module protection error”, so they
have similar inspection methods.
Inspection path: supply voltage→Compressor wire, reactor wire→
System blocked→Module panel damaged→Outdoor Unit main PCB
destroyed→Compressor destroyed
Tools required
for inspection
Multimeter, pressure gauge, module panel in normal condition
Frequent
problematic part
Supply voltage, compressor wire, reactor, system pressure, module
panel, Outdoor Unit main PCB, compressor
Inspection
procedure and
key points
1. Is the order of compressor wires not correct, which makes the
compressor rotate reversely? Try exchanging the compressor wires on
U-V phase to see if the problem can be solved?
2. Check if the supply voltage is unstable and highly volatile, and test
if the system pressure is normal. High system pressure will cause
rotating problems to the compressor.
3. Is the module panel fixed to the radiator firmly? Will it cause pool
cooling? Is the Indoor Unit and Outdoor Unit heat exchanger dirty,
which lead to poor heat transfer and high system pressure?
4. If “compressor out-of-step error” will be indicated immediately after
starting up, it is almost certain that it’s substantial error, having nothing
to do with supply voltage and system pressure, it is suggested to
observe if there is any component destroyed by strike arc near the
module panel; use the multimeter to test if the resistances between any
two compressor wires are the same. The resistances between any two
compressor wires in normal condition are tiny resistances at ohm level
and are basically equal; then use the megameter to measure if the
resistance insulation of the three compressor wires against the earth
wire is good (normally at MΩ level), and check if the reactor wire is
well connected or the reactor is destroyed. Check if the DC voltage
between P-N is too high (above 200V).
5. Test if the 15V and 5V (3.3V) power supply on the module panel is
stable and exclude the module panel error caused by power supply of
the Outdoor Unit main PCB.
6. Replace with the module panel in normal condition for test. If the
test is normal after changing the module panel, then the original
module panel is destroyed.
7. After excluding problems of module, connecting wires, system and
power supply, distinguish by ear. If there is only electromagnetic sound
and the compressor does not work; or the sound of irregular running
appears after the compressor works for a while and then it shuts down
and indicates error; chances are that the compressor is blocked or
destroyed, consider replacing the compressor.