6.7 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 control 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.
Fan motor starts.
Lockout during pre-purge.
Jammed or damaged servomotor.
Servomotors do not reach desired
position.
Check and adjust or change.
Burner control stays waiting for
start release.
Start-up release loop is open.
Find out cause, repair.
Low gas pressure.
Find cause and repair.
Faulty differential air pressure
switch.
Change.
Motor failure
Condition
Possible cause
Action
Fan or oil pump motor does not
start. Lockout occurs.
Break in main circuit.
Find out cause of the break.
Break in control circuit.
Find out cause of the break, see
circuit diagram. Check burner
control operation. Replace faulty
burner control.
Motor overload/thermal relay
released.
Check setting, reset.
M4263 2206EN
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