Lost inverter communications, elevated from fault 33 after 3 occurrences. The outdoor control and the inverter are not talking.
Bryant outdoor 48 means the outdoor control and the inverter have stopped communicating. It is elevated from fault 33 after 3 occurrences. Causes are a loose harness between AOC plug PL20 and the inverter, electrical noise, and possible inverter damage. For noise, the manual says the system tries repeated starts. If the harness is good and the inverter is damaged, change the inverter drive. Code 33 is the local fault after 2 minutes. This page is the lockout-style communication fault.
Likely causes
- Loose or disconnected harness between outdoor-control plug PL20 and the inverter
- Radio or electrical noise
- Possible inverter damage
Safe checks for 48
- Count 4 short flashes and 8 long flashes. Code 33 is the earlier local version of the same loss
- Technicianverify the harness between PL20 and the inverter. The manual says the system will try repeated starts if the cause is electrical noise. If the inverter is damaged, change the inverter drive
Capacitors can hold a charge after the power is off. Safety terms.
When to call a pro
Call a licensed HVAC technician. Harness and inverter work is inside a cabinet that carries line voltage.
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