HVACopediaCarrier · Heat pump
59 Discharge temperature high (event)
What the control is telling you
Amber STATUS light flashes 59. Compressor discharge temperature went over the limit. The unit stages down each time; after 5 events it becomes code 74 (2-hour lockout). Type: Local; reset: 15 minutes, then one stage lower.
Applies to: Carrier Infinity 18VS variable speed heat pump 25VNA8 (AOC control + inverter)
Likely causes
- See code 74 for causes
Test and repair steps
- Troubleshoot as code 74.
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Source: Carrier 25VNA8 / 24VNA9 Service Manual, Table 6 Fault Code Actions, p.21. Summarized in our own words; check the original manual for your model.
Homeowner looking at this code? See what it means for you and when to call a technician.
For licensed technicians. Gas, electrical and refrigerant work must be done by a qualified, licensed person. Shut off power and gas before servicing, never bypass a safety control, and follow the manufacturer’s manual for the exact model; it and local codes always take priority. HVACopedia is not affiliated with any manufacturer; brand and model names only identify the equipment.