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24. Troubleshooting
24.1 General Errors
Error Message
Possible Causes
Remedy
Factory Calibration
Data Failure
Temperature Readings
may be Inaccurate
The EEPROM chip which
contains the factory calibration
information has failed.
The unit must be returned to TPS for
service.
•
Temperature readings may be up to 10%
incorrect.
•
Conductivity/TDS readings will be
accurate after 2 point calibration.
EEPROM Write Failure
Return to Factory for
Service
User calibration settings have
been lost or corrupted.
Switch the meter OFF and switch back ON.
If the problem persists, return the unit to
TPS for service.
Logged Data pointer
failure
All Logged Data Lost
1. Memory back-up battery has
lost its charge due to lack of
use of the instrument.
2. Memory back-up battery is
faulty.
Recharge the memory back-up battery by
switching the meter on for approx. 16 hours
(this does not need to be continuous).
Return the instrument to the factory to have
a new rechargeable battery fitted.
"
NoFlo
" message does not
appear, even when the
Conductivity sensor is dry
and in air
(
hydro
CHEM
-DS unit
which uses Conductivity
reading for flow sensing.)
1. Conductivity sensor has a
build-up of salts or algae
between wires.
2. Conductivity sensor is faulty.
Clean probe as per section 25.2.2.
Return sensor to factory for repair or
replacement.
"
NoFlo
" message appears
even when the Conductivity
sensor is in solution.
(
hydro
CHEM
-DS unit
which uses Conductivity
reading for flow sensing.)
1. Conductivity of solution is
below 0.5 mS/cm (0.2 ppK
TDS).
2. Conductivity sensor is faulty.
The flow sensing function only operates if
the Conductivity is above 0.5 mS/cm (0.2
ppK TDS).
If a fresh batch of water is being used, use
the Quick-Dose function (section 4) to raise
the Conductivity to above 0.5 mS/cm.
An optional pump detector is available to
solve this problem automatically. Please
contact the factory or your distributor.
Return sensor to factory for repair or
replacement.
"
NoFlo
" message does not
appear, even when the main
pump is OFF.
(Standard
hydro
CHEM
unit which uses pump
sensor for flow sensing.)
Pump sensor is faulty.
Return sensor to factory for repair or
replacement.
"
NoFlo
" message appears
even when the main pump
is operating.
(Standard
hydro
CHEM
unit which uses pump
sensor for flow sensing.)
3. Pump sensor not mounted in
optimum position on main
pump housing.
4. Pump sensor is faulty.
Try mounting the sensor in alternative
positions on the pump. The best position is
close to the pump motor.
Return sensor to factory for repair or
replacement.
