10
x
Faults and malfunctions
ROTEX GCU compact -
51
10.3 Fault codes
Tab. 10-2 Error codes of interlocking malfunctions (can be detected by
the firing unit)
Code
Component/Designation
Fault
E12
Automatic firing unit
Interlocking fault
t
V
or t
R
defective (cable break, short circuit).
E65
During calibration, difference from prior value was too high (unclean supply air, electrode re-
placement, electrode defective).
E129
Flow temperature exceeds limiter temperature (overtemperature, no heat dissipation)
E130
Return flow temperature exceeds limiter temperature (overtemperature, no heat dissipation)
E132
2x no flame formation at end of safety time (no gas, valves do not open, no ignition sparks)
E138
2x flame failure at end of safety time (ionisation electrode defective or dirty)
E148
Gas valve test negative. A flame is still detected 15 s after the burner shutdown (gas valve
jams).
E152
Speed not reached during pre- and post-ventilation (burner blower defective, power supply
to blower, electronics fault in the blower, cable break).
E154
Blower stationary position not reached (burner blower defective, electronic fault in the burner
blower).
E158
EEPROM fault (manufacturer’s parameters).
E159
EEPROM fault (safety parameters).
E189
Regulation deviation during ionisation process too high (as of 2nd fault) (burner grounded in-
correctly or faulty supply voltage firing unit, gas flow pressure too low, ionisation electrode
bent or oxidised, ionisation track faulty, safety gas control block defective)
E190
–
Impermissible gas fitting initiation within 10 s (from the 2nd fault) or
–
Blower falls below 80 % of the minimum speed within 10 s (from the 2nd fault).
(Burner blower defective, wrong gas type set, missing/incorrect gas nozzle, safety gas con-
trol block defective, gas flow pressure too low)
E191
Internal electrical fault- from the 2nd fault (switch the unit on/off).
E192
A value fell beneath the minimum thresholds during calibration (flue gas recirculation, elec-
trodes oxidised, ionisation track faulty, poor earthing, transition resistances).
E194
Interruption during calibration (no heat dissipation, minimum calibration time not met).
E195
Impermissible internal value (electronic fault).
E202
A value exceeded the maximum threshold values during calibration (unclean supply air, basis
value too high).
E215
EEPROM fault (electronic fault).
E226
Fault found in the flame amplifier evaluation during the idle state check (electronic fault, short
circuit ionisation electrode or cable).
E227
Internal fault to firing unit.
