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7.7 Troubleshooting
CAUTION!
• Only authorised electricians are permitted to perform troubleshooting operations on the
opened control cabinet and replace components!
Warning threshold undershot
Indication: Arrow pointing down
Safety threshold undershot
Indication: Two flashing arrows pointing down
The remaining clear flushing time is shown
(2 squares flash instead of the seconds)
Fault: Safety threshold undershot (after maximum clear flushing time has elapsed)
Error message: UV sensor
➤ Confirm error message with ENTER key
➤ Press CHANGE key to assume emergency mode (see 4.3.20)
Emergency mode: Safety threshold undershot
➤ System continues operating in emergency mode
Possible cause Coating on lamp protective tube
Remedy ➤ Clean lamp protective tube
Possible cause Deterioration of UV transmission of water to be treated
Remedy ➤ Improve water quality
Possible cause UV lamp at end of useful life
Remedy ➤ Install new UV lamps
Possible cause Incorrect lamp current
Remedy ➤ Operate with standard current
Possible cause Sensor not calibrated correctly
Remedy ➤ Recalibrate sensor
Fault: Lamp failed
Error message: xx lamp defective
➤ Confirm error message with ENTER key
➤ Press CHANGE key to assume emergency mode (see 4.3.20)
Emergency mode: Lamp failed
➤
System continues operating in emergency mode
Possible cause Lamp xx defective
Remedy ➤ Install new UV lamps
Possible cause Incorrect lamp current
Remedy ➤ Operate with standard current
Possible cause Ballast defective
Remedy ➤ Replace ballast
IMPORTANT!
• The number of failed UV lamps is indicated.
• If more than one UV lamp has failed, the individual lamps can be queried by pressing the
UP and DOWN key.
Fault
xx lamps defective
Lamp #xx
Emergency mode
xx lamps defective
Lamp #xx
Maintenance
↓↓
↓↓
↓ 55.0 W/m
2
10 h Operation
20 ON/OFF
↓↓
↓↓
↓
↓↓
↓↓
↓ 40.0 W/m
2
Clear flushing
Time 00:11
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