Troubleshooting; Test Run; Malfunction Diagnosis Method By Main Remote Controller; Summary Of Self Diagnosis Based On Error Codes And Service Procedures - Mitsubishi Electric EHSE-YM9EC Service Manual

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TROUBLESHOOTING

10-1. Troubleshooting
<Summary of self diagnosis based on Error Codes and Service Procedures>
Present and past Error codes are logged and displayed on the main remote controller or control board of the outdoor unit.
Please refer to the table below and subsequent explanations to diagnose and remedy typical problems that may occur in the field.
Unit Condition
Reoccurring problem
Non reoccurring problem
NOTE:
Electrical components should only be replaced as a final option. Please follow instructions in tables in "10-4. Self diagnosis and action" and "10-5.
Troubleshooting by inferior phenomena" fully before resorting to replacing parts.

10-2. Test Run

Before a test run
• A fter installation of outdoor unit, pipework and electrical wiring, recheck that there is no water leakage, loosened connections or miswiring.
• M easure impedance between the ground and the power supply terminal block (L,N) on the outdoor and indoor units with suitable (500V) ohmmeter. Resistance
should be ≥ 1.0 MΩ .
• R ead the Installation and Operation Manuals fully especially the safety requirements before carrying out any test runs.

10-3. Malfunction diagnosis method by main remote controller

If during start up or operation a malfunction occurs, the error code screen may be displayed on the main remote controller.
The error code screen shows the following; code, unit, ref. address, and telephone number of installer (only if previously entered by the installer)
Please note in the case of some malfunctions an error code is not generated, please refer to table in "10-5. Troubleshooting by inferior phenomena" for more de-
tails.
To reset
1. To reset the main remote controller press F4 button (Reset).
2. Then press F3 (Yes) to confirm.
OCH590B
Error Code Action
Displayed Use table "10-4. Self diagnosis and action" to identify fault and correct.
Not Displayed Use table "10-5. Troubleshooting by inferior phenomena" to identify fault and correct.
Logged 1. Check temporary causes of defects such as the operation of safety devices on the
refrigerant/water circuit including compressor, poor wiring, electrical noise, etc. Re-check
the symptom and the installation environment, refrigerant amount (Split systems only),
weather conditions at time of fault, etc.
2. R eset Error code logs, Service the unit and restart system.
Not Logged
1. Recheck the abnormal symptom
2. I dentify cause of problem and take corrective action according to Table "10-5. Trouble
shooting by inferior phenomena".
3. If no obvious problem can be found, continue to operate the unit.
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