Troubleshooting
11
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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
Buderus Heiztechnik GmbH • http://www.heiztechnik.buderus.de
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
Troubleshooting
Remedy
The burner does not start.
Heating system emergency stop switch
ON?
Switch ON.
Control device ON/OFF switch ON?
Switch ON.
Fuses OK?
Check continuity and faulty part, if
required.
Boiler water thermostat is satisfied?
Check and replace faulty part, if required.
High limit safety cut-out has tripped?
Check and replace faulty part, if required.
Has the flue gas monitor responded?
If the monitor responds repeatedly, check
the flue gas system and carry out a flue
gas monitor function check. Replace, if
faulty.
Initial start-up:
Burner starts and goes into a fault state
after approx. 20 seconds.
Fault display on the control device.
Info:
The valve check system (leak
monitor) of the burner control unit signals
a gas valve leak.
Remedy the installation fault.
Gas governor installed acc. to
instructions?
Gas governor adjusted to the correct
value?
Correct sequence observed during the
gas type conversion?
After commissioning:
Burner attempts to starts but goes into a
fault state after approx. 20 seconds.
Fault display on the control device.
Info:
The valve check system (leak
monitor) of the burner control unit signals
a gas valve leak.
Due to contamination, one of the solenoid
valves leaks and must be replaced.
After commissioning:
Burner attempts to starts but goes into a
fault state after approx. 5 seconds.
Fault display on the control device.
Info:
The burner control unit has detected
a flue gas sensor fault.
Remedy fault and replace sensor, if
required.
Is the flue gas sensor inserted?
Has the plug a loose contact or is there a
break in the sensor lead?