Carel AL21 Error Code
Outlet air temperature probe faulty or disconnected 60 s (fied) AL22 Ambient hum
Source: 030221426.pdf
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relay involved compact split EO active ON probe 1 error= control automatic √ √ E
Probe S2 fault OFF OFF automatic unchanged unchanged unchanged changed un- YES N
Probe S3 fault OFF OFF automatic unchanged unchanged unchanged changed YES NO ch