A J3 error code could mean the sensor that monitors the compressor’s discharge pipe temperature has gone open-circuit or short-circuit. This is different to an F3 fault, which is triggered by the temperature itself being too high. J3 means the sensor reading that temperature has failed.
Because this sensor is part of the compressor’s overheat protection system, a fault here shouldn’t be brushed aside, even though the compressor may seem to be running fine.
Send us the code and a photo of the display, and a Ford & Doonan technician will get back to you. Please don't reset the unit before you take the photo.
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