!!
critical Silvercrest
Error Code S A
Spa is shut down because the sensor plugged into the 'A' jack has failed or malfunctioned.
? What Causes This
Faulty sensor in plug socket ‘A’
✓ How to Fix It
Verify the correct operation of the sensor and contact service if not.
Source: page 8 of the official manual
From the manual
This error code appears in:
Silvercrest Sfb 80 A1 Foot Spa