w w w . i n n o v a i r . c o m
DELUXE
Inverter
Service
M
anual
(11) 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→Main external control panel
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, main external
control panel, compressor
Inspection
procedure and
key points
1. I
f
the order of compressor wires
is in
correct,
it can cause reverse rotation of the
compressor.
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
internal and external heat exchanger dirty, which lead
s
to poor heat transfer and
high
system pressure?
4. If “compressor out-of-step error”
is
indicated immediately after starting up, i
t is
almost certain that it’s substantial error, having nothing to do with supply voltage and
system pressure
. I
t 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 main external control panel.
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
eliminating possible module
problems, connecting wires, system and power
supply, listen and try to identify irregular sounds
. If there is only electromagnetic
sound and compressor does
n't
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
the compressor is blocked
or destroyed, consider replacing the compressor.
Special attention
For the “compressor out-of-step error” and “module protection error”, the former is
calculated by the main chip of the module panel and the latter is detected by the power
module itself. They are abnormal operating phenomenon of the compressor essentially.
If there is uncertainty about either error, analyze both together with similar method. For
inverter air conditioners that are in poor electrical environment or are old, occasional
occurrence of such errors is a normal protection.
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