Amana PTAC codes: two characters, and the second one matters

What Does Error Two-character codes Mean?

Amana PTAC units display short two-character codes on the front panel, and both characters carry meaning. Reading only the first, or transcribing a letter as a digit, produces a lookup that lands on an unrelated entry, which is the most avoidable error in diagnosing this equipment. Applies to: Amana packaged terminal air conditioners and heat pumps covered by the Amana PTAC service literature Amana PTAC equipment spans cooling-only and heat pump models with different control generations, including units fitted with the DigiSmart control system. The service literature for the model on the chassis data plate is what maps a code, and a chart written for a different generation can give a different answer. Owner-safe checks: Photograph the display close up and read both characters from the image rather than from across the room. | Check that the supply cord is fully seated and whether any protective device on the plug has operated. | Clean the filter following the owner manual and clear anything obstructing the exterior grille that can be reached from outside. Qualified technician: Anything that requires the chassis to come out of the wall, or a meter to touch the board, belongs to a technician on equipment of this type. | A protective device on the supply cord that operates repeatedly is a stop condition rather than something to keep resetting, and it needs an electrical assessment.