Leak test failed - Flow sensor disc

Recently, one of our units encountered the error of FLOW SENSOR DISC during the leak test.

I have checked all the tubings and I've tried replacing the flow sensor as well, Nothing worked out.

Any suggestions?

crwdns2934089:0crwdne2934089:0 crwdns2934093:0crwdne2934093:0

crwdns2934109:0crwdne2934109:0

crwdns2889612:0crwdne2889612:0 0
crwdns2934285:0crwdne2934285:0