6 x Faults and malfunctions
34
BA ROTEX GSU - 09/2007
Tab. 6-4 Fault codes for the ROTEX GSU for control ALPHA 23R
13-0
Storage tank temperature sensor
interruption (if sensor registered)
The resistance of the storage tank temperature sensor is high or the calculated value is above
120°C. A hot water demand with a fixed flow temperature of 40°C is generated at intervals of 30
minutes. This has a time limit of 10 minutes. The system resumes regular operation only after the
measured values last for longer than 1 sec.
13-1
Storage tank temperature sensor short
circuit (if sensor registered)
The resistance of the storage tank temperature sensor is zero or the calculated value is
below -40°C. A hot water demand with a fixed flow temperature of 40°C is generated at intervals
of 30 minutes. This has a time limit of 10 minutes. The system resumes regular operation only after
the measured values last for longer than 1 sec.
16-0
Flue gas temperature sensor interruption
(if registered by parameter [1])
Measured value >150°C
The system goes out of operation. The system resumes operation only after the measured value
last for longer than 1 sec.
16-1
Flue gas temperature short circuit (if
registered by parameter [1])
Measured value <-10°C
The system goes out of operation. The system resumes operation only after the measured value
last for longer than 1 sec.
30-3
Burner failure: does not switch on There is a burner demand. However, no burner counter signal (oil) or burner flame signal (gas) could
be detected after 20 minutes. The display issues a warning, which can be quit using "RESET".
The control functions continue to work normally.
30-9
Burner failure, gas The automatic firing unit registers a failure through the bus. The burner can be reset by pressing
the key. The control functions continue to work normally.
33-5
Flue gas temperature sensor: warning
temperature reached
Measurand > Parameter [23]
The display issues a warning, which can be quit using "RESET“. The system continues to work
normally.
33-8
Flue gas temperature sensor: switch-off
temperature reached
Measurand
≥ Parameter [22]
The burner is taken out of operation for 10 minutes. Then it is unlocked until the next time the
temperature [22] is exceeded. The system resumes normal operation after expiry of the cooling
phase.
70-1 Communication fault ALPHA 23R/CVBC The system is stopped until communication is restored or the fault is rectified.
The display can be deleted via "RESET".
99-9
Undervoltage The mains voltage falls below 190 V for at least 1 sec.
The processor backs up all data and goes into sleep mode. All relay contacts drop out. If the mains
voltage goes over 195 V for at least 5 secs restart is triggered.
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Interruption of a sensor
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Short circuit in a sensor
Fault code Component/name Fault
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