I'm new to the forum. Glad I found it, looks like there's a lot of good info here.
I have a brand new AutoPilot Pool Pilot Digital (DIG-220) with an SC-60 cell, in service for a little over a month with no problems until this past weekend. On Saturday I noticed the red light was flashing and the display was showing low salt. The "test pool pilot" function showed 0ppm salt.
I killed power to the unit, unplugged and reconnected the tri-sensor cable at both ends, and started back up, and it started working again, so I assumed it was just a problem with the cable not being seated properly. However the problem came back the next day. It seems to be an intermittent thing; sometimes it will show the correct level on startup (actual salt concentration is 2800ppm per AquaChek test strip) but then a few minutes later it will read 0ppm. Occasionally it will read low salt (say 1500ppm) but the most common failure mode is 0ppm.
The other tri-sensor functions (temperature and flow) seem to be working normally.
I pulled the cell and the tri-sensor and inspected both; both appear completely clean. The unit works fine otherwise, but the frustrating thing is I never know when it's going to stop producing purifier because it thinks the salt is low.
I called the factory and they gave me an auth code for warranty service and the number of the nearest service center, so I can get someone out to look at it. But in the meantime I was wondering if anyone had seen this problem before. Is there anything I can test to try to narrow this down to a bad cable vs. bad tri-sensor vs. something else?
Also, considering that the system is working fine otherwise, and I know my salt concentration is OK, is there a way to bypass the salt test (with a jumper or something perhaps) so that the system will keep producing purifier until I can get the problem resolved?
The pool is a 22'x40' in-ground concrete, approx 35,000 gallons with a sand filter. Not sure if water chemistry has any bearing on this problem, but at last check my FC was 6.0 (shocked recently), pH 7.5, TA 80, hardness around 120, CYA 40, salt around 2800ppm as mentioned above. Water is clear with no visible problems.
Any insight would be greatly appreciated. Thanks!