PH probe not working any longer

[chachew]

My pH probe has been working fine since i got my RA but all of the sudden the pH readings just stuck at 1.42 and never move.

I have reloaded my InitialInternalMemory code and then tried the probe again after a few reboots of the RA but to no avail. Any ideas?? It reads 1.42 and NEVER changes from that number

[rimai]

Try these:
Unplug USB cable.
Disconnect the float switches from the head unit.

Did anyone of the above make a difference on the reading?

[chachew]

I tried your suggestions above and they didnt effect the reading at all from the pH probe. I have also tried unplugging everything from the RA unit except the pH probe and then rebooted it, no changes to the readings.

[rimai]

Does your probe look ok?
Check the glass bulb at the tip.

[chachew]

Yea everything looks fine, i have rinsed it off and checked for debris all looks good. It has been sitting in the same spot in the sump since i bought it. My whole setup is only about 3-4 weeks old so im stumped, it was working fine and all of the sudden one day i woke up and it wasn't reading correctly anymore.

Here is an image of it

[dwptwo]

Did you ever find a solution for this? I have the exact same issue. I've also tried all of the above, reading is stuck at 1.42 and the calibration reads 0. My RA is about 30 days old. Maybe a bad probe? Thanks for the help.

[DrewPalmer04]

I had a bad probe (2 mo old) Roberto sent me a new one but the new style's cable is wayyyy too short

[dwptwo]

Thanks for the reply. I figured the probe was bad.

[chachew]

Yes, the probe was bad. The new probe i got was the newer style, green, and it works perfectly. I agree the cable is a little too short compared to the other one. I did a test on my water as well for stray voltage and i had .2v reading from my water. I put in a tank ground probe and immediately read as 0v, maybe this could have burned out a probe?

[DrewPalmer04]

The new probe corrected all the graphed pH swings. It's as stable as it should be because I know my pH is tight. New probe instantly corrected issues I had immediately with that old probe style.