Error code reference

Denso Air Conditioner Error Code AL

Detection of unit stop signal from fire alarm system: input fire alarm signal received from fire alarm system.

SourceDENSO Classic 40 - Full Service Manualp. 44

Diagnostic procedure

The full AL procedure

Step 1 is visible so you can confirm you are on the right page. The remaining steps, the ones that tell you whether to actually replace a part, unlock with any pass.

MyPros+ · DiagnosticsStep 1 preview

First diagnostic step

Check fire alarm signal off. To reset: hold down SET TEMP UP and DOWN buttons simultaneously for 3 seconds.

SourceDENSO Classic 40 - Full Service Manualp. 44

Unlock with pass

More steps, wiring diagram references, and verified part numbers

Includes expected resistance and voltage values, connector pinouts, and supersession notes for replacement parts.

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Where this code is documented

2 manuals in the MyPros+ library document this code for Denso air conditioner.

Models covered by the manuals that document this code

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The full AL procedure

Where this code is documented

Models covered by the manuals that document this code

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