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English
18
25.0 Troubleshooting guide
Trouble Reason Correction
pH reading
inaccurate
pH probe not plugged in.
Connect pH probe. Check pH probe
connection.
Using factory default calibration. Calibrate pH probe.
Contaminated pH probe /
glassware not clean.
Clean pH probe, then calibrate.
Calibration old. Calibrate pH probe.
Broken glass bulb, tube or
connector.
Replace pH probe.
pH probe damaged or old. Replace pH probe.
Bad grounding (noisy/jumpy pH
readings).
Earthlink required. Attach temperature
probe. Go to Menu, turn Earthlink on.
Display shows
‘Failed <e>’
during
calibration
Old or contaminated solutions used
for calibration.
Use fresh calibration solutions.
Dirty or contaminated pH probe. Clean pH probe.
pH probe tip been allowed to dry. Hydrate pH probe.
pH probe damaged or old. Replace pH probe.
No display
Mains not switched on. Switch mains power on.
Power adaptor not plugged in.
Plug power adaptor into the power
socket marked ‘PWR’.
Mains on, power adaptor plugged in. Replace power adaptor.
No display after
initial LCD test,
when plugged in
Backlight set to minimum.
Increase Backlight setting in MENU, or
hold <cal> button down while applying
power, to restore Factory Defaults.
pH displays
‘or’, ‘ur’, ‘-.-‘
‘or’ Over range pH.
‘ur’ Under range pH.
Check pH probe connection. pH probe
could be faulty. Clean pH probe, then
calibrate.
‘-.-’ Temperature over/under range.
Solution <0°C / 32°F or >51°C / 122°F.
Check solution temperature. Ensure
temperature probe plug is fully inserted.
Temperature
displays
‘or’, ‘ur’, ‘- -‘
‘or’ Over range temperature.
‘ur’ Under range temperature.
‘- -’ Temperature probe not
connected.
Solution >51 °C / 122 °F.
Solution <0 °C / 32 °F.
Ensure temperature probe plug is fully
inserted. Temperature probe is faulty,
replace.
pH symbols
ashing
It has been more than a month
since last pH calibration.
Clean pH probe, then calibrate.
‘HELP’ ashing
[Ineffective
control detected]
Dosing solution container empty. Rell dosing solution container.
Dose direction setting incorrect for
your system.
Ensure setting reects dosing solution in
use. i.e. For Acid select Down.
Dose on/off times incorrect.
See section 17.0 for setting Dose On/Off
times correctly.
Output from tube not dripping into
solution.
Ensure tube output drips into tank.
Solution is not mixing.
Ensure pH correction solution is being
mixed in tank.
pH probe not seeing pH changes,
after dosing
Ensure pH probe is in tank/reservoir
solution with adequate mixing.
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