Solving the 'Check System Ph Calibration Error' with Your PH-1-3-0309 Probe: A Customer Support Dialogue

Client:
Best, I bought the PH-1-3-0309 ph probe from you for my Hayward Aqua Rite pro. But now I keep getting the message "Check system Ph calibration error". How can I solve this?

Technical Advisor:
Hello, that is probably a bad probe. Can you make this small test to check: https://ph-redox-pool.com/gb/content/16-ma-sonde-ph-est-elle-hors-service-

Client:
Naturally

Technical Advisor:
Give me the results, we will send you a new one in case.

Client:
Oke

Technical Advisor:
👍

Client:
I will do the test later, I did buy the probe from you last year in August.

Technical Advisor:
Ok, no issue. It is under garantie.

Client:
Oke, thanks.

Technical Advisor:
The tracking number will be: https://tracking.postnl.nl/track-and-trace/3SDOKC1612119-BE-9150

Client:
Thanks.