Friedrich MD24Y3J Svc Manual page 61

Check Point
1. Check the WCN_P(L),P(N) Connection condition at the Main PCB.(Refer to outdoor wiring diagram)
2. Check the DC Link voltage at not operating(280V↑)
3. Check the DC Link voltage at Comp operating(340V↑)
4. Check DC Link Sensing Signal :2.4~2.8V (Refer the Picture)
* AUUW24GD2 [MR24UY3J]
IN/I
GND
Black
Red
Vdc
<CT Sensing Check Point>
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Only for training and service purposes