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Daniel LewisJul 29, 2025
What to do if Toshiba HFC R407C shows inverter serial signal short circuit?
- Bbridget42Jul 29, 2025
If you are experiencing an inverter serial signal short circuit with your Toshiba Air Conditioner, it may be due to a wiring fault between the indoor unit and the Multi Controller, or between the Multi Controller and the outdoor interface PC board. Other potential causes include a defective communication PC board, a defective IPDU PC board, external noise, or a high-level refrigeration leak. It is recommended to replace the communication cable. If that doesn't resolve the issue, the communication PC board or the IPDU PC board may be defective and need replacement. A leak-check of the unit is also recommended.
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