6 x Faults and malfunctions
33
BA ROTEX GSU - 09/2007
Tab. 6-3 Fault codes for the ROTEX GSU for control THETA 23R (detected from the automatic firing unit)
Control ALPHA 23R
Fault code Component/name Fault
E 01
CVBC automatic firing unit
interlocking fault
No flame detection during the 5 possible start attempts
E 02
Wrong flame signal ionisation current outside the permitted range
E 03
STB failure: Inflow temperature too high
E 05
No speed signal from burner fan within 10 sec
E 08
Fault in the flame monitoring routine
E 10
EEPROM communication error
E 11
CVBC automatic firing unit
interlocking fault
Sensor equalisation procedure for electronic STB function faulty or return flow temperature higher
by 3 K than flow temperature for more than 3 min.
E 19
Microprocessor H - I/O error
E 20
Microprocessor L - I/O error
E 21
Microprocessor H - A/D-converter error
E 22
Microprocessor L - A/D-converter error
E 25
Internal fault
E 26
5 times flame stalling within 4 minutes
B 09
CVBC automatic firing unit
temporary failure
Error in gas valve control routine
B 30
Flow sensor short circuit
B 31
Flow sensor interruption
B 34
Low voltage (< 185 V)
B 35
Fluctuating mains frequency (more than
±2 Hz)
B 37
Internal fault
B 43
Return flow sensor short circuit
B 44
Return flow sensor interruption
B 99
Internal communication between control and CVBC automatic firing unit interrupted.
Fault code Component/name Fault
10-0
Outside temperature sensor interruption The resistance of the outside temperature sensor is high or the calculated value is above 130°C.
The system continues to work with a constant outside temperature value of 0°C until the
measured values are in the correct range again.
10-1
Outside temperature sensor short circuit The resistance of the outside temperature sensor is zero or the calculated value is below -40°C.
The system continues to work with a constant outside temperature value of 0°C until the
measured values are in the correct range again.
11-0
Flow temperature sensor interruption The resistance of the flow temperature sensor is high or the calculated value is above 130°C.
The system goes out of operation. The system resumes operation only after the measured values
last for longer than 1 sec.
11-1
Flow temperature sensor short circuit The resistance of the flow temperature sensor is zero or the calculated value is below -40°C.
The system goes out of operation. Control functions continue to run. The system resumes operation
only after the measured values last for longer than 1 sec.
12-0
Mixer circuit temperature sensor
interruption
The resistance of the mixer circuit temperature sensor is high or the calculated value is
above 130°C. The system goes out of operation. The system resumes operation only after
the measured values last for longer than 1 sec.
12-1
Mixer circuit temperature sensor short
circuit
The resistance of the mixer circuit temperature sensor is zero or the calculated value is
below -40°C. The system goes out of operation. The system resumes operation only after the
measured values last for longer than 1 sec.
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