I have problem with Carrier supra 522 error code

[niggaz_nature]

Hello . On control display on Carrier Supra 522 is show ALT.EXT .

What does this code or if someone could give me a list of code errors. Thank you.

[pkw111]

is it definitely ALT EXT? not ALT AUX?

[niggaz_nature]

sorry

ALT AUX

[moggy66]

Alternator not charging, is there a belt on it, are the belts turning when the engine is running?

[nova]

Hi,

ALT AUX can also be a result of bad engine oil pressure switch.



-nova-

[Vandman]

Does the unit say ALT AUX before it starts, or after it has been running?

[perthtech]

No signal from the D+ of the alt to the micro. Could be brushes, reg or alternator itself,