Model reference

Denso OFFICEPRO24

Name: Denso OFFICEPRO24
Brand: Denso

Air Conditioner

1 document8 error codes7 service modes

Available documentation

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ALRM on my Denso OFFICEPRO24

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Fire alarm input signal detected — unit

From Service Manual 771658, p.30:

1.Access service mode to confirm the active fault code and read stored error history.

2.Measure control board supply voltage at test points. Expected: 12 VDC and 5 VDC.

3.Inspect all connectors on the main control for corrosion or backed-out pins.

Part WPW10804018

Electronic control board

CodeMeaning

Change model settingWhile pressing DOWN and UP arrow buttons, plug the power cord
Key lock modePress ENTER and SET CLOCK buttons simultaneously for 5 seconds
LCD and LED all-on test modePress HI/LO and UP arrow buttons simultaneously for 3 seconds.
Show model namePress ENTER and SET CLOCK buttons simultaneously for 5 seconds, or turn unit on.
Show running hoursPress ON/OFF and UP arrow buttons simultaneously for 3 seconds
Show service codePress ON/OFF and DOWN arrow buttons simultaneously for 3 seconds. Service codes displayed
System resetPress ON/OFF and HI/LO buttons on the control box simultaneously for 5 seconds.

Full entry steps, exit procedures, and test sequences are available in Max.

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