Variable Speed Module (if equipped)
Test method
Outcome
1. Turn control switch S1 to position 0 (STOP) to cut off
power supply from burner control.
2. Detach speed sensor cable from burner controller
(connector X70).
3. Turn control switch S1 back to position 1 (CONTROL).
4. To start the burner, turn control switch S1 to the flame
position (position 2, AUTOMATIC).
During prepurge, the burner stops due
to a fault. The error code is 15 and the
diagnostic code is 40 (VSD Module – Fan
speed not reached).
Boiler safety devices
Test method
Outcome
When the burner is in standby position, activate, for example,
the temperature limiter switch from the boiler safety chain (X3–
04:1) and start the burner. Perform this test to all safety circuit
devices one by one.
Devices connected to the safety circuit are described in the
electrical diagram.
The burner does not start and the text
Safety loop open
switches with
Safety
shutdown
on the display.
6.9 Troubleshooting
Before troubleshooting, check the section
First start-up
If the fault can not be found in the
First start-up
, check the individual burner functions.
Reset the burner controller if it is in lockout position. The burner goes to standby
position. When the prerequisites for start are fulfilled, the burner starts. Observe the
burner functions, program phase, and possible faults from the operating and display
unit. Use measuring instruments for identifying the fault.
For further information, refer to
Troubleshooting fault codes
or burner control
manufacturer manual.
Start failure
Condition
Possible cause
Action
Burner does not start. Burner
control remains in stand-by
position. Set temperature or
pressure too low.
Break in control loop.
Required start-up signal from
burner control terminal X5-03.4
does not transfer to terminal
X5-03.1.
Find out the cause of the break.
Control unit is damaged.
Change.
Control loop closed, burner or
control unit start-up program does
not start.
1. Faulty servomotor
2. Faulty control unit
3. Mechanical jam in levers or
couplings.
1. Change servomotor.
2. Change control unit.
3. Check and release.
Safety loop open.
Find out cause of the break.
Check burner control terminals
X3-04.1 and X3-04.2
Faulty differential air pressure
switch.
Change.
M4219 2305EN
105 (111)
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