Range code list
System air conditioners code list
Family-scoped air-conditioner codes with the shortest useful meaning line for quick triage.
CodeMeaningSeverityOpen
CH05
The indoor and outdoor units are not communicating, often because the outdoor unit has lost power.
On applicable ceiling-mounted or system installations, CH05 appears on the controller or unit display when communication fails.
High
CH07
Units connected in the same system are running in conflicting operating modes.
The code appears as CH07 when linked indoor units in the same system are set to incompatible modes.
Medium