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TROUBLESHOOTING
(7) Checking of Compressor
CLIENT: MODEL: DATE:
Serial No.: Production Date: Checker:
CHECK LIST ON COMPRESSOR
No. Check Item Result Remarks
1 Are THM8, THM9, THM12 and THM13 (1) Are wires of each thermistor correctly
correctly connected? connected by viewing?
THM8, THM9, THM12, THM13: (2) Check to ensure that 7-segment
Discharge Gas Thermistor indication of Td1 is higher than Td2, Td3,
Td4 when No.1 comp. is operating.
Td1: Temperature of THM8
Td2: Temperature of THM9
Td3: Temperature of THM12
Td4: Temperature of THM13
2 Are thermistor, THM8, THM9, THM12 (1) Check to ensure that thermistor on the
and THM13 disconnected? top of comp. is correctly mounted by
viewing?
(2) Check to ensure that actually measured
temp. are greatly different from the
indication (Td1, Td2, Td3, Td4) during
check mode.
3 Are connectors for current sensor (1) Check to ensure that indication A1, A2,
correctly connected? A3 and A4 are 0 during compressor
stopping.
4 Is current sensor faulty? (2) Check to ensure that indication A1, A2,
A3 and A4 are not 0 during compressor
running. (However, A2, A3 and A4 are
5 Is current sensing part on PCB3 faulty? 0 during stopping of No.2, No.3 and
No.4 comp.)
6 Is the direction of current sensor Check the direction => by viewing.
(CTU, CTV) reverse?
7 Are power source wires, U and V Check to ensure that wires are correctly
inserted correctly into current sensor? inserted.
8 Are ex. valves (MV1, MV2 and MVB) Check to ensure that MV1 to CN10 and
correctly connected? MV2 to CN11 are correctly connected.
9 Are ex. valve coils (MV1, MV2 and MVB) Check to ensure that each coil is correctly
correctly mounted? mounted on the valve.
10 Are the refrigeration cycle and electrical Check to ensure that refrigerant is flowing
wiring system incorrectly connected? into indoor units by operating one
refrigerating cycle only from the outdoor unit.
11 Is opening of ex. valve completely Check the following by the check mode
closed (locked)? of outdoor units.
(1) Liquid Pipe Temp. (TL) < Air Intake
Temp. (Ti) during Cooling Operation
(2) Liquid Pipe Temp. (TL) > Air Intake
Temp. (Ti) during Heating Operation
12 Is opening of ex. valve fully opened Check to ensure that liquid pipe temp. is
(locked)? lower than air intake temp. of stopping
indoor unit when other indoor units are
operating under cooling operation.
13 Are the contacts for comp. magnetic Check the surface of each contact (L1, L2
switch CMC faulty? and L3) by viewing.
14 Is there any voltage abnormality among Check to ensure that voltage imbalance is
L1-L2, L2-L3 and L3-L1? smaller than 3%.
Please note that power source voltage must
be within 380V or 415V
+10%, 220V+10%.
15 Is the comp. oil acidified during Check to ensure that the oil color is not
compressor motor burning? black.
Check Method
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