Suction pressure sensor fault. The suction pressure transducer reading cannot be trusted. There is no reset time on this row.
Carrier 57 is a suction pressure sensor fault. It is not low-pressure trip 32 and not high-pressure switch 31. Causes are an electrical short that destroyed the transducer electronics, and heat damage during brazing. The actions are to compare the transducer reading with a gauge at the service valve, correct the short, and replace the transducer. There is no filter step and no coil-cleaning step on this row.
Likely causes
- Electrical short destroyed the transducer electronics
- Heat damage during brazing
Safe checks for 57
- Count 5 short flashes and 7 long flashes. Do not add refrigerant because a pressure sensor failed
- Techniciancompare the transducer reading with a gauge at the service valve, using the transducer chart in the manual. Correct an electrical short and replace the transducer
Capacitors can hold a charge after the power is off. Safety terms.
When to call a pro
Call a licensed HVAC technician. Gauge work and transducer replacement are not homeowner checks.
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