Mitsubishi Electric · Air Conditioning
The resistance of resistor R111 on the indoor power P.C. board is not approximately 4 ohms. This indicates a fault with the resistor or the board itself.
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Turn off the power supply.
Replace the indoor electronic control P.C. board.
If R111 is a replaceable component, consider replacing just the resistor if accessible and technician has capability.
Re-measure after replacement to confirm correct resistance.