CONNECT SERIES SERVICE MANUAL
19
ENGLISH
Troubleshooting
IPM, PFC Testing Method
Method of Testing IPM Module
• Turn o power to the outdoor unit for at least one minute. Set a multi meter to diode test function.
Remove the U, V and W wires from the compressor.
Testing Steps
1. Place the black meter lead on the “P” terminal and place the red meter lead on U, V and W respectively to
measure voltage between UP, VP and WP.
2. Please the red meter lead on the “N” terminal and the black meter lead on U, V, and W respectively to
measure voltage between NU, NV and NW.
3. A good IPM board is indicated by reading 0.3 to 0.7 volts between UP, VP, WP, NU, NV and NW.
4. A bad board is indicated by a zero reading in any of the measurements.
Method of Testing PFC Module Short Circuit
• Turn o power to the outdoor unit and wait at least one minute. Set a multi meter to diode test. Remove
wires from L1-2, and L2-1.
Testing Steps:
1. Place the black lead on terminal P and the read lead on terminal L1-2 and L2-1 respectively. Measure the
voltages between L1-2 and P; L2-1 and P.
2. Place the red lead on terminal N and the black lead on L1-2 and L2-1 respectively. Measure the voltage
between N and L1-2 and N and L2-1.
3. Voltages between 0.3 and 0.7 volts indicate a normal PFC module. Any zero volt measurement indicates a
failed module.
AUH2436ZGDAA
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