خلل مسجل في وحدة تحكم المكيف

A pointer code: the air conditioning module has stored a fault of its own, and another module is reporting that its data cannot be relied on. It says where to look rather than what is wrong, and the reporting module is healthy.

Read the air conditioning module's own codes first. Diagnosing the module that raised this one is diagnosing a messenger. The originating fault is frequently not electrical at all — refrigerant pressure outside its window, a failed pressure sensor, or a seized compressor all make the module refuse to operate, and refusing is correct. Check system pressure and the compressor circuit before any module is suspected, since a system simply low on refrigerant produces a module-level fault with nothing wrong electrically.