Siemens LMV37.4 Series Basic Documentation page 201

Error
Diagnostic code
code
87 #
0
Bit 0
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
Building Technologies
HVAC Products
Meaning for LMV37.4... system
Error air actuator
Position error
Open-circuit
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 po wer
supply fed to safety relay
Basic documentation LMV37.4...
28 Error code list
Recommended measures
Target position could not be reached within the required tolerance band.
1. Check to see if actuator is locked or overloaded.
Open-circuit detected at the actuator's terminals.
1. Check wiring (voltage X53 across pin 5 or 6 and pin 2 >0.5 V).
The slope of the curve may be a maximum position change of 31° between 2 curvepoints in
modulating mode
Actuator was overloaded or mechanically twisted.
1. Check to see if the actuator is blocked somewhere along its working range.
2. 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.
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CC1P7546en
01.12.2009