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[6] MALFUNCTION (PARTS) CHECK METHOD
1. Procedure for determining defective outdoor unit IPM/compressor
The following flow chart shows a procedure for locating the cause of a malfunction when the compressor does not start up and a DC overcurrent indi-
cation error occurs.
2. Diode bridge check method
Turn off the power and let the inverter electrolytic capacitor (C8, C9) discharge completely. Then use a tester and check continuity.
When using a digital tester, the (+) and (-) tester lead wires in the table must be reversed.
3. Inverter electrolytic capacitor (C8, C9) check method
Turn off the power, let the inverter electrolytic capacitor (C8, C9) discharge completely, and remove the capacitor from the control printed circuit board
(PWB). First, check the case for cracks, deformation and other damages. Then, using a needle-type tester, check continuity.
Determination of normal condition
The tester needle should move on the scale and slowly returns to the original position. The tester needle should move
in the same way when polarities are reversed. (When measurement is taken with the polarities reversed, the tester
needle exceeds the scale range. Therefore, let the capacitor discharge before measurement.)
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