Probe Reading Solution
LO (00)
No readin
usually means the wires aren’t properly connected. Check all the
wire connections, and the wire itself for damage. If everything’s hooked up
correctly, the problem could be delamination; to check for this detach wires
from probe, attach both voltmeter wires (use ohm setting) to one probe post,
with one wire on the sensor side, one wire on the screw/wire attachment
side to verify continuity. Repeat for the second post. Scrap probe if there's no
continuity, and verify probe location meets guidelines before installing a new
one
Too low, overdosing
Check tank for extreme scale build up. If there’s a lot of scale, clean the
probe.
Too high, not dosing
enough
Replace the probe. This failure should only be seen on pre-Y2K temperature
compensated probes. Newer temp comp probes are medical grade and
shouldn’t fail in this manner.
HI (99)
This failure usually indicates a short. Check the wires to ensure there’s no
short, and check the back of the probe for moisture. Sometimes if the probe
is wet in back, replacing it and allowing it to dry will allow it to function again.
In rare cases moisture may work into the body of the probe; when this occurs
the probe can’t be dried out and instead must be scrapped.
Probe Troubleshooting Chart
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