Lost inverter communications, the local fault. It occurs after 2 minutes with no communication between the outdoor control and the inverter, and it elevates to fault 48 after 3 consecutive failures within 20 minutes or after 20 minutes of continuous loss.
Bryant outdoor 33 is lost inverter communication, the local fault. It is logged after 2 minutes with no talk between the outdoor control and the inverter, and it becomes fault 48 after 3 failures in 20 minutes or after 20 minutes continuous. The manual says to use the fault 48 checks. Furnace code 33 is a limit switch. This outdoor 33 is not that.
Same characters, different appliance: Bryant 33 on a furnace is a different fault. Bryant furnace 33.
Likely causes
- The service manual points code 33 at the fault 48 checks
- Loose or disconnected harness between outdoor-control plug PL20 and the inverter
- Radio or electrical noise
- Possible inverter damage
Safe checks for 33
- Count 3 short flashes and 3 long flashes. Do not open the outdoor cabinet to reseat a harness
- Techniciancheck the harness between PL20 and the inverter. For noise, the manual says the system tries repeated starts. 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. This cabinet carries line voltage. Furnace code 33 is a limit fault and does not apply here.
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