Siemens ULTRAMAT 23 Series - Page 183

Message Possible causes Remedy
Bridge supply voltage beyond toler‐
ance
Channel ampli󹪝er of IR receiver faulty
Motherboard faulty
Half-bridge voltage beyond tolerance Channel ampli󹪝er of IR receiver faulty
Motherboard faulty
Lockin error Channel ampli󹪝er of IR receiver faulty
Motherboard faulty
Sensitivity of O2 sensor too low O
2
sensor faulty or no longer usable as
result of aging
Replace the O
2
sensor as described in sec‐
tion Replacing the electrochemical oxy‐
gen sensor (Page 173)
External ADC error Electronics faulty
External fault Signaling of an external fault (system-spe‐
ci󹪝c)
Check the connected devices for faults as
described in section Con󹪝guration: In‐
puts/outputs/pump: Binary/sync inputs
(Page 143).
H2S Probe Protection H2S protection function: sample gas con‐
centration too high
Check sample gas, see also section Probe
protection function (Page 157)
Zero point of H2S sensor too high Purge time too short for calibration Repeat calibration
Sensitivity of H2S sensor too low Sensor exhausted Replace sensor
UV module does not respond Power supply unit faulty
Cable of the UV module faulty or not con‐
nected
Power supply of the UV module faulty
Error and system messages
11.2 Faults
ULTRAMAT 23
Equipment Manual, 04/2022, A5E37100388-012 183