P00150
Carrier Transicold
Critical
Check SV4 Circuit
Failure in solenoid valve 4 (SV4) circuit.
Possible causes
- Open or shorted SV4 coil
- Poor ground connection
- Internal APX module failure
Recommended actions
- Measure SV4 coil resistance (approx. 10-20 ohms)
- Clean J2 connector contacts
- Replace solenoid
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