Siemens LMV5 Series Technical Instructions page 242

Error Diag.
Device Display
Code Code
40 Any #
41 Any #
Any #
01..
FF
Internal Fault
01
LMV5
Basic Unit
02
42
04
08
10
20
40
80
Any #
Internal Fault
Basic Unit
01
No Fuel Train
02
defined
03
04
05
43 06 LMV5
Internal Fault
07
Basic Unit
08
09
0A
0B
Section 7
Meaning for the LMV5x System
Fault with Base Unit (LMV5)
Wrong contact position of safety relay
Wrong contact position of ignition
Wrong contact position of a fuel valve relay
The diagnostic value is made up of the following faults or their
combinations (the individual diagnostic codes are added up in
hexadecimal format)
Contact position fault safety valve (SV) oil
Contact position fault V1 oil
Contact position fault V2 oil
Contact position fault V3 oil
Contact position fault safety valve (SV) gas
Contact position fault V1 gas
Contact position fault V2 gas
Contact position fault pilot valve (PV) gas
Fault in connection with plausibility check.
For cause of fault, refer to diagnostic code.
No fuel selection
No defined fuel train parameterized or undefined type of fuel
Variable "Train" not defined
Variable "Fuel" not defined
Operating mode with load controller not defined
Prepurge time gas too short
Prepurge time oil too short
Safety time 1 gas too long
Safety time 1 oil too long
Ignition off time > TSA1 gas
Ignition off time > TSA1 oil
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Corrective Action
If fault occurs sporadically, reduce electrical noise.
If fault occurs continuously, replace LMV5.
Check wiring on igniton transformer.
1) Check to see if any source is feeding back voltage
onto the output. If so, eliminate the voltage source.
2) Check for switches in the safety loop that are
opening and closing again very quickly. This could be a
pressure switch or a low water cut-out that is on the
edge of opening and is "chattering". All outputs are
powered through the safety loop, so the microprocessor
that monitors the outputs can detect this, resulting in a
fault.
If fault occurs sporadically: reduce electrical noise.
Select a fuel externally (by energizing or de-energizing
terminals) or select a fuel through the AZL.
Select the proper fuel trains for gas and / or oil. See
section on settings.
Select a fuel externally (by energizing or de-energizing
terminals) or select a fuel through the AZL.
The time defined by PrepurgeTmeGas(Oil) is less
than the time defined by parameter
MinT_PrepurgeGas(Oil) . Change so that
PrepurgeTmeGas(Oil) is longer than
MinT_PrepurgeGas(Oil) . See section on settings.
The time defined by Max SafetyTGas(Oil) is less than
the time defined by parameter SafetyTme1Gas(Oil) .
Increase Max SafetyTGas(Oil) or decrease
SafetyTme1Gas(Oil) .
If fault occurs sporadically, reduce electrical noise.
SCC Inc.