9
Troubleshooting and error messages
WARNING!
Live parts!
Possible consequence: Fatal or very serious inju‐
ries.
– Measure: Disconnect the device from the
power supply before opening it.
– Disconnect damaged and defective devices or
devices that have been tampered with from the
mains power supply.
– Only permit an authorised electrical technician
to undertake troubleshooting on the open con‐
trol cabinet and replace components.
Tab. 5: Troubleshooting
Fault
Cause
Solution
UV radiation intensity is very
low or 0.
Fault message: Display S1,
minimum radiation intensity
undershot,
messages’ on page 36
Fault message: Display S2,
warning threshold undershot,
Sensor connecting cable incorrectly
attached.
Check connections and change if
necessary.
UV sensor and/or lamp protection
tube is/are dirty.
Perform cleaning.
UV lamp too old.
Replace UV lamp.
The spectral attenuation coefficient
SSK-254 of the water is too high.
Check the spectral attenuation coeffi‐
cient SSK-254 of the water and repro‐
gram S1 and S2 if necessary.
Ensure that the maximum permissible
flow is not exceeded in accordance
with the characteristic curve.
The control cannot be con‐
trolled in
[AUTO] operating
mode.
Remote ON/OFF switch not con‐
nected or remote ON/OFF terminal
not bridged.
Connect and activate remote
ON/OFF switch or insert bridge in
remote ON/OFF terminal
Tab. 6: Error messages
Error
Cause
Solution
Display:
[!LAMP!]
Indicates a UV lamp malfunction and the
number of malfunctioning UV lamps.
Check contacts. Replace the UV
lamp.
Display:
[TEMP!]
Indicates when the temperature of a con‐
nected thermal switch has been
exceeded.
Change t2 and t3 (see programming)
Display:
[! S1 ! / ! S2 !]
Indicates that the adjusted minimum radi‐
ation intensity / warning threshold has not
been reached (e.g. due to water quality,
deposit formation, operating life of the UV
lamp).
Clean, check and if necessary
replace the UV lamp
Troubleshooting and error messages
36