Service manual

101

Troubleshooting

Diagnostic Procedure for Check Code

Check code Operation cause

1. Indoor unit in automatic addressing mode

[dE] 2. Indoor unit P.C. board setup error

Indoor address undefined 3. Defective indoor unit P.C. board

4. Communication noise interference

While this check code is displayed, wait for a moment. When the address is defined, the

operation is automatically reset. However, if the check code does not disappear

20 minutes after the power source was turned on, a fault is considered. Check the following

items.

• Fault check of indoor unit P.C. board

• Source check of communication noise interference

• Incorrect setup of jumper options on indoor unit P.C. board

Check code Operation cause

1. Outdoor unit in automatic addressing mode

[dF]

2. Defective indoor unit interface P.C. board

Outdoor address undefined

3. Communication noise interference

While this check code is displayed, wait for a moment. When the address is defined, the

operation is automatically reset. However, if the check code does not disappear 20 minutes

after the power source was turned on, a fault is considered. Check the

following items.

• Fault check of outdoor unit interface P.C. board

• Source check of communication noise interference between outdoor units