Alarm 353 (or 501, 184) Failed start, no pressure diff. — Low pressure difference at compressor start

What does Failed start, no pressure diff. 353 mean?

This alarm indicates that the pressure difference between BP9 and BP8 has been too low at compressor start 3 times within 30 minutes, suggesting a fault in the pressure sensors or compressor.

• Fault in pressure sensor BP8, BP9.
• The compressor does not compress the refrigerant sufficiently.
• Compressor breakdown.

Click steps to track your progress.

1. 1

   Check the indoor module/control module display for specific action instructions.

2. 2

   Verify that the pressure sensors (BP8, BP9) are securely connected and not loose.

3. 3

   If the issue persists, contact a qualified technician to inspect the pressure sensors and compressor operation.