Carrier 42QHF012DS - Page 61

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Pic 2:IPM or outdoor main PCB (For
38VNM218713)
Self-Check
Power,
Operating
PIC 4 :Main board LED when power on and unit
standby.
Self-Check
Operating
Pic 3: IPM or outdoor main PCB (For
38VNM327713 / 38VNM436713)
Pic 1: check the voltage of N to S (Vs), is it moving
alternately between positive value and negative
value?
PIC 5: check point button,
Press 1 time for check how many indoor units are connected