Control Sequence In The Event Of Fault; Resetting The Lme7 - Siemens LME71 Series Basic Documentation

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6.4 Control sequence in the event of fault

If a non-alterable lockout occurs, the outputs for the fuel valves, the burner motor and the
ignition equipment are always immediately deactivated (<1 second).
Cause
Mains voltage failure
Voltage below undervoltage threshold
Voltage above undervoltage threshold
Extraneous light before safety time
Extraneous light during waiting time
No flame at the end of safety time
Loss of flame during operation
Air pressure switch has welded in the
operating position
Air pressure switch has welded in the no-
load position
No air pressure signal on completion of
the specified time
POC contact is open during startup
Pressure switch-min: Failure during
operation
In the event of a non-volatile lockout, the LME7 remains locked and the signal lamp (LED)
lights up red permanently. The LME7 can then be reset immediately. This state is also
maintained in the event of mains voltage interruptions.

6.5 Resetting the LME7

After a non-alterable lockout, the burner control can be immediately reset.
To do this, press the lockout reset button (info button) for about 1 second (<3 seconds).
The LME7 can only be reset when all contacts in the line are closed and when there is
no undervoltage.
Basic Documentation LME7...
6 Function
Response
Restart
Safety shutdown
Restart
Non-alterable lockout
Start prevention, after approx. 30 seconds
of a non-alterable lockout
Non-alterable lockout at the end of the
safety time
Depending on the PME7, refer to User
Documentation A7105.x.
Non-volatile lockout or 1 x restart
Start prevention, after a maximum of 30
seconds of a non-alterable lockout
Non-alterable lockout at the end of the
specified time
Non-alterable lockout, with down time ≥0.3
seconds
Non-alterable lockout, approx. 5 seconds
after control thermostat or pressurestat ON
or pressure switch ON
Shutdown and start prevention
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CC1P7105enr
24.07.2020