Heat Controller B-MMC09FA-1, B-MMH12FA-1, B-MMC12FA-1, B-MMH09FA-1, A-MMH24FA-1 manual Error Code

Models: A-MMC24FA-1 B-MMH12FA-1 A-MMC18FA-1 B-MMC12FA-1 A-MMH36FA-1 A-MMH18FA-1 B-MMH09FA-1 A-MMC36FA-1 A-MMH24FA-1 B-MMC09FA-1

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Troubleshooting Guide

ErrorCode

Trouble Shooting

Error

Description

Cause of error

Check point & Normal condition

code

 

 

 

 

 

 

 

 

 

• Open / Short

Normal resistor : 10K/ at 25°C(77°F) (Unplugged)

01

Indoor air sensor

• Soldered poorly

Normal voltage : 2.5Vdc / at 25°C(77°F) (plugged)

 

 

• Internal circuit error

 

 

 

 

 

 

 

 

 

• Open / Short

Normal resistor : 5K/ at 25°C(77°F) (Unplugged)

02

Indoor inlet pipe sensor

• Soldered poorly

Normal voltage : 2.5Vdc / at 25°C(77°F) (plugged)

 

 

• Internal circuit error

 

 

 

 

 

 

 

 

 

• Open / Short

Normal resistor : 5K/ at 25°C(77°F) (Unplugged)

06

Indoor outlet pipe sensor

• Soldered poorly

Normal voltage : 2.5Vdc / at 25°C(77°F) (plugged)

 

 

• Internal circuit error

 

 

 

 

 

 

 

10K

2.5Vdc

V

Check the resistance / voltage

Check Point

1.Unplug the sensor on Indoor unit PCB.

2.Estimate the resistance of each sensor

3.If the resistance of the sensor is 10K/5Kat 25°C(77°F), then sensor is normal

4.If the resistance of the sensor is 0 Kor , then sensor is abnormal. Change the sensor.

5.Plug the sensor onto the Indoor unit PCB and Power ON.

6.Estimate the voltage of each sensor.

7.If the voltage of the sensor is 2.5Vdc / at 25°C(77°F), then sensor is normal.

8.If the resistance of the sensor is 0 or 5Vdc, then sensor is abnormal. Repair or Change the PCB

Wall Mounted Multi-Zone Split System Air Conditioner

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Heat Controller B-MMC09FA-1, B-MMH12FA-1, B-MMC12FA-1, B-MMH09FA-1, A-MMH24FA-1, A-MMH36FA-1, A-MMH18FA-1 manual Error Code