When The Louver Does Not Operate - Heat Controller B-MMC09FA-1 Service Manual

Wall mounted multi-split system air conditioning/heat pump

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Troubleshooting Guide

When the louver does not operate.

Trouble 5

When Vertical Louver does not operate.

• Confirm that the Vertical Louver is normally geared with the shaft of

Stepping Motor.

• If the regular torque is detected when rotating the Vertical Louver with

hands

• Check the connecting condition of CN-UP/DOWN Connector

• Check the soldering condition(on PWB) of CN-UP/DOWN Connector

• Confirm that there is DC + 12V between pin (RED) of CN-UP/DOWN and

GND.

• Confirm that there is a soldering short at following terminals.

- Between

• Confirm the assembly conditions that are catching and interfering parts in

the rotation radial of the Vertical Louver

70 Multi type Air Conditioner

Normal

Check the operating circuit of the Vertical Louver

and

of MICOM

and

of IC01M

and

of CN-UP/DOWN

If there are no problems after above checks

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