Siemens LMV37.4 Series Basic Documentation page 224

Error
Diagnostic code
code
Valency 1
Bit 3

Valency 8
Bit 4

Valency 16
90 #
91 #
93 #
3
95 #
3 Ignition transformer
4 Fuel valve 1
5 Fuel valve 2
6 Fuel valve 3
96 #
3 Ignition transformer
4 Fuel valve 1
5 Fuel valve 2
6 Fuel valve 3
97 #
0
224/235
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Meaning for the LMV37.4... system
Curve too steep in terms of ramp rate
Sectional deviation in comparison with last referencing
Internal error basic unit
Internal error basic unit
Error flame signal acquisition
Short-circuit of sensor
Error relay supervision
External power supply active contact
Error relay supervision
Relay contacts have welded
Error relay supervision
Safety relay contacts have welded or external power
supply fed to safety relay
Basic documentation LMV37.4...
29 Error code list
Remedy
 check wiring (voltage X53 across pin 5 or 6 and pin 2 >0.5 V)
Check position differential between the curvepoints and the modulating operating ramp setting
(parameter 544).
1. Modulating operating ramp 32 seconds
The slope of the curve may be a maximum position change of 31° (15° for SQM33.6 and 9° for
SQM33.7) between 2 curve points in modulating mode.
2. Modulating operating ramp 64 seconds
The slope of the curve may be a maximum position change of 62° (30° for SQM33.6 and 18° for
SQM33.7) between 2 curve points in modulating mode.
Actuator was overloaded or mechanically twisted.
1. Check the setting of the actuator type (parameter 613.1)
2. Check to see if the actuator is blocked somewhere along its working range.
3. Check to see if the torque is sufficient for the application.
Short-circuit at QRB...
1. Check wiring.
2. Flame detector possibly fault.
Check wiring
Test the contacts:
1. Unit connected to power: Fan output must be dead.
2. Disconnect power: Disconnect fan. No resistive connection between fan output and neutral
conductor allowed.
If one of the 2 tests fails, release the unit since contact have definitively welded and safety can no
longer be ensured.
Test the contacts:
1. Unit connected to power: Fan output must be dead.
2. Disconnect power: Disconnect fan. No resistive connection between fan output and neutral
conductor allowed.
If one of the 2 tests fails, release the unit since contacts have definitively welded and safety can no
longer be ensured.
CC1P7546en
20.09.2013