Rotex GCU compact - Rectifying Burner Faults and STB Faults

10 x Faults and malfunctions
ROTEX GCU compact - 
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Tab. 10-4 Fault codes (can be detected by switching panel PCB)
10.4 Rectifying burner faults and STB faults
Interlocking faults detected by the automatic firing unit can only
be reset manually directly on the boiler.
Unlocking the automatic firing unit:
Requirements: The cause of the malfunction is rectified, the
burner is electrically connected.
1. Switching ROTEX GCU compact on.
2. Push the Exit button (fig. 6-1, item 15) for at least 5 secs.
Î Menu "Special Level" is displayed.
3. Select the "FA failure" level w
ith the rotary switch.
Î Fault code and request "Reset" is displayed.
4. Select "Yes" with the rotary switch.
5. Confirm the changes with a brief push of the rotary switch.
Î Fault is reset.
6. Cancelling and jump back by pushing the Exit button again.
Code Component/Designation Fault Possible fault rectification
E72 Internal mixer sensor
Measured value outside measuring range,
temperatu
re sensor defective.
Ɣ Check cable, terminal and plug connec-
tions.
Ɣ Replace the temperature sensor
.
E75 Outside temperature sensor
E76
Storage
tank temperature
senso
r
E81 Eeprom
Internal fault
Ɣ Total reset
Ɣ Replace switching panel PCB in
controller.
E88
Switching panel
PCB control-
ler
E91 Connected CAN modules
Bus detection of a CAN module doubly pre-
sent.
Ɣ Set bus addresses
correctly.
E100 Flue gas temperature Internal fault Ɣ Replace the combustion controller.
E129 Pressure sensor
Measured value outside measuring range,
sensor / temperature sensor defective.
Ɣ Check cable, terminal and plug connec-
tions.
Ɣ Replace the sensor / temperature
sensor.
E198 FlowSensor Volume flow too low.
Ɣ Check heating circulation pump / filter /
heating network.
E200
Communi
cation automatic
firing
Fault in communication between automatic fir-
ing and switching panel PCB on controller.
Ɣ Che
ck cable and plug connections.
Ɣ Total reset
Ɣ Replace control panel PCB on the Gas
Combi Unit compac
t.
Ɣ Replace the combustion controller.
W8001
FlowSensor
Volume flow fell below the minimum limit.
Ɣ Check the parameter settings (see
Control System Instructions).
Ɣ Check the pipes and valves for
blockages.
Ɣ Che
ck the built-in circulation pump.
E8002 Flow
under minimum threshold (300 l/h)
W8003
Flue gas temperature
The flue gas temperature has exceeded the
threshold temperature.
Ɣ Cle
an the boiler
E8004
The flue
gas temperature has exceeded the
pe
rmissibl
e absolute maximum value.
E8005
Water pressure
Measured value under permissible minimum
value.
Ɣ Top up heating water.
Ɣ
Leak test
W8006
Warning message: Maximum permissible
p
ressure drop exceeded
.
W8007
Warning message: Measured value over per-
missible maximum value.
Ɣ Che
ck diaphragm expansion vessel.
Ɣ Drain heating water.
WARNING!
Risk of burns due to very hot boiler body with STB
fault.
Ɣ Do not touch any metallic parts on the boiler.
Ɣ Let the boiler cool down.
Ɣ Wear protective gloves.
The cause of the last fault is saved in the unit and can
be reconstructed on restarting the unit, even after
power failure.