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7
TROUBLESHOOTING
7-1. 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.
If error codes are displayed, refer to the service manual of the cylinder unit (hydrobox) to solve the problem.
7-2. Test Run
Before a test run
• After installation of outdoor unit, pipework and electrical wiring, recheck that there is no water leakage, loosened connections or miswiring.
• Measure impedance between the ground and the power supply terminal block (L,N) on the outdoor and indoor units with suitable (500 V) ohmmeter. Resistance
should be ≥ 1.0 MΩ .
• Read the Installation and Operation Manuals fully especially the safety requirements before carrying out any test runs.
7-3. Malfunction diagnosis method by main remote controller
If a malfunction occurs during start up or operation, 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 that an error code is not generated, please refer to the service manual for the cylinder unit (hydrobox) for more details.
To reset
1. To reset the main remote controller press F4 button (Reset).
2. Then press F3 (Yes) to confirm.
8
OCH729
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