EC500-en-GB_v2.6 10/14
13
Troubleshooting
Problem Possible Cause Action
Reading is frozen Unit is in “HOLD” mode Press MODE/HOLD key to
exit “HOLD” mode
“BAT” message Batteries are low Replace batteries
Unit will not calibrate in pH Low pH slope Replace electrode, see
reorder information
Unit will not calibrate in pH Clogged or contaminated
reference junction
Clean junction (see
cleaning instructions)
Unit will not calibrate in pH Damaged or worn out
sensing membrane
Replace electrode, see
reorder information
Unit will not calibrate in pH Contaminated pH buffers Use fresh buffers
Unit will not calibrate in
conductivity mode
Contaminated conductivity
standards
Use fresh standards
Unit will not calibrate in
conductivity mode
Dirty probe Clean conductivity probe
(See cleaning instructions)
Unit will not calibrate in
conductivity mode
Damaged conductivity probe Replace electrode, see
reorder information
Unit will not calibrate in
conductivity mode
Trapped air bubbles Tap or stir to release air
bubbles
Unit will not turn on Batteries are low or dead Replace batteries
Unit will not turn on Batteries installed with
incorrect polarity
Replace batteries,
observe polarity
“RENEW” message pH sensor needs
recalibration
Recalibrate unit
Use fresh buffers
“RENEW” message pH sensor slope has fallen
below acceptable limits
Replace electrode, see
reorder information
Unit will not respond to any
key presses
Internal fault Perform hard reboot:
Remove batteries, hold
ON/OFF switch down for 5
seconds, replace batteries
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