Digital Burner Control Unit - Buderus Logano GE434 Maintenance Instructions Manual

Troubleshooting

11.2 Digital burner control unit

PLEASE NOTE
A sizeable number of current faults and
earlier faults saved to the automatic
device can be downloaded from the
memory with a special MPA hand-held
terminal. This makes a fault analysis
substantially quicker and more reliable. A
corresponding fault code table is included
with the service set hand-held terminal.
Operating condition/faults observed
The burner does not start.
Initial start-up:
Burner starts and goes into a fault state
after approx. 20 seconds.
Fault display on the control device.
After commissioning:
Burner attempts to starts but goes into a
fault state after approx. 20 seconds.
Fault display on the control device.
After commissioning:
Burner attempts to starts but goes into a
fault state after approx. 5 seconds.
Fault display on the control device.
We reserve the right to make any changes due to technical modifications.
Commissioning and maintenance instructions Logano GE434 Gas-fired special boiler • Issue 02/2003
Troubleshooting
Heating system emergency stop switch
ON?
Control device ON/OFF switch ON?
Fuses OK?
Boiler water thermostat is satisfied?
High limit safety cut-out has tripped?
Has the flue gas monitor responded?
Info: The valve check system (leak
monitor) of the burner control unit signals
a gas valve leak.
Gas governor installed acc. to
instructions?
Gas governor adjusted to the correct
value?
Correct sequence observed during the
gas type conversion?
Info: The valve check system (leak
monitor) of the burner control unit signals
a gas valve leak.
Info: The burner control unit has detected
a flue gas sensor fault.
Is the flue gas sensor inserted?
Has the plug a loose contact or is there a
break in the sensor lead?
Remedy
Switch ON.
Switch ON.
Check continuity and faulty part, if
required.
Check and replace faulty part, if required.
Check and replace faulty part, if required.
If the monitor responds repeatedly, check
the flue gas system and carry out a flue
gas monitor function check. Replace, if
faulty.
Remedy the installation fault.
Due to contamination, one of the solenoid
valves leaks and must be replaced.
Remedy fault and replace sensor, if
required.
Buderus Heiztechnik GmbH • http://www.heiztechnik.buderus.de
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