Low pressure lockout for 4 hours, elevated from fault 32 after 3 occurrences.
Homeowner part this code names: AC coil cleaner.
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Carrier 83 is a low-pressure lockout for 4 hours, elevated from fault 32 after 3 occurrences. The LED flashes 8 short and 3 long. The 6-minute trip is code 32. The high-pressure lockout is code 84 (8 short and 4 long). Causes listed for 83 are a service valve left closed, an undercharged system, low indoor airflow in cooling or low outdoor airflow in heating, an EXV or TXV malfunction, reversing valve bypass, a restriction in the filter drier, expansion device, circuits or tubing, and an uninsulated vapor line in cooling. In cooling, check the indoor coil for ice or debris, and check the outdoor coil as well. Opening service valves, reading the charge, and troubleshooting the EXV, TXV, or reversing valve are technician steps.
Likely causes
- Service valve left closed
- Undercharged system
- Low indoor airflow (cooling) or low outdoor airflow (heating)
- EXV or TXV malfunction
- Reversing valve bypass
- Restriction in the filter drier, expansion device, circuits or tubing
- Uninsulated vapor line (cooling)
Safe checks for 83
- In cooling mode, check the indoor coil for clogging by ice or debris and clean or de-ice it if necessary (the manual also says to troubleshoot the indoor fan motor)
- Check the outdoor coil for clogging by ice or debris and clean or de-ice it if necessary (the manual also says to troubleshoot the outdoor fan motor)
- Technicianmake sure the service valves are open; check charge with the manufacturer's charging method; troubleshoot the EXV/TXV and reversing valve; check for a restriction
Capacitors can hold a charge after the power is off. Safety terms.
When to call a pro
Call a licensed HVAC technician: lockout 83 involves refrigerant charge, valves and expansion devices.
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Parts & tools for this fix
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AC and heat pump coil cleaning supplies: guide
In this code: In cooling mode, check the indoor coil for clogging by ice or debris and clean or de-ice it if necessary (the manual also says to troubleshoot the indoor fan motor)
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