551 Error Code For Wuzheng Tractor Models

There are 1860 kind of error description.

Description:

Hand Throttle (STD cab) Idle Validation Switches are both open

Foot Throttle Idle Validation Switches are both open (engine controller pins B25, B26)

Hissing noise at expansion valve, Loss of refrigerant.Restriction in refrigerant system.Check receiver-dryer for uniformity of temperature.