119
Troubleshooting Main Components
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1. Shut off main power. After main power is shut off, wait at least ten (10) minutes until
inverter compressor PCB DC voltage is discharged.
Red (+) and Black (-) are the multi-tester terminals.
After switching off the main power supply and verifying that the DC voltage was discharged, wait
for at least ten (10) minutes before checking the electrical components in the control box. There
is risk of electric shock, physical injury or death.
Checking the Inverter Compressor Phase Diode Bridge
RS T
Figure 55: 6LPSOL¿HG'LDJUDPRID3KDVH'LRGH
Bridge.
Table 64: Checking the Phase Diode Bridge.
2. Disconnect all connections to the three-phase diode bridge.
3. Set the multi-tester to diode mode.
4. Measured value must be 0.4V ~ 0.7V as shown in table below.
5. If the measured value is different than what is listed in the table below, set the multi-
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6. If the diode bridge is damaged, check if the inverter PCB assembly (IPM) also needs to
be replaced.
WARNING
Figure 56: Location of Phase Diode Bridge Terminals (Appearances Will
Vary Depending on Model).
T
S
R
Diode Terminal
Tester Terminal
+ Terminal:
black (-)
- Terminal:
red (+)
5a5HG 0.4V ~ 0.7V -
6a5HG 0.4V ~ 0.7V -
7a5HG 0.4V ~ 0.7V -
R (~) : Black (-) - 0.4V ~ 0.7V
S (~) : Black (-) - 0.4V ~ 0.7V
T (~) : Black (-) - 0.4V ~ 0.7V
CHECKING THE PHASE DIODE BRIDGE
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