My softener is 10yrs old and has worked fine up until today. I went to put salt in it (low but not empty) and the low salt level light was flashing. I added 2 bags of salt, but was not able to reset the salt level. Only the time on the until is displayed and continually flashes. Anytime I push a button on the left side, it just beeps. When I push the manual regeneration button, it just beeps- no regeneration. The only button on the right that works is the down arrow. I can use that to lower the time, but that is it. I tried holding in the Select button for 4 sec and then pressing it again to enter the manual mode- nothing. Any ideas?? Hate to spend another $600