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Building Technologies Basic documentation LMV37.4... CC1P7546en
29 Error code list (all LMV2 types / LMV3 types) 17.12.2018
Error
code
Diagnostic code Meaning for the LMV37.4 Recommended measures or causes
standardized speeds (e.g. after restoring a data set to a new LMV37.4)
→ repeat standardization and check the fuel-air ratio
20 Wrong phase of phase manager
Standardization was made in a wrong phase. Permitted are only phases 12
load controller OFF, start standardization again
21 Safety loop / burner flange open
Safety loop or burner flange is open repeat standardization with safety loop closed
22 Air actuator not referenced
Air actuator has not been referenced or has lost its referencing.
1. Check if the reference position can be approached.
2. Check if actuators have been mixed up.
3. If error only occurs after the start of standardization, the actuator might be overloaded and
cannot reach its destination.
23 VSD deactivated
Standardization was started with VSD deactivated
activate the VSD and repeat standardization
24 No valid operation mode
Standardization was started without valid operation mode
activate valid operation mode and repeat standardization
25 Pneumatic fuel-air ratio control
Standardization was started with pneumatic fuel-air ratio control
standardization with pneumatic fuel-air ratio control not possible
Attention!
If speed supervision is required in the pneumatic fuel-air ratio control, the
relevant parameters must be set (parameters 667 / 668 / 669) before
standardization.
128 Running command with no preceding standardization
VSD is controlled but not standardized
make standardization
255 No standardized speed available
Motor turns but is not standardized
make standardization
83 # Speed error VSD Required speed has not been reached
0 Speed error when trim function is active
Increase parameter 662 (neutral zone in speed supervision) and parameter 663 (close range in
speed supervision)
Bit 0
Valency 1
Lower control range limitation of control
Speed has not been reached because control range limitation has become active
for measures, refer to error code 80
Bit 1
Valency 2...3
Upper control range limitation of control
Speed has not been reached because control range limitation has become active
for measures, refer to error code 80
Bit 2
Valency 4...7
Interruption via disturbance pulses
Speed has not been reached due to too much electromagnetic interference on the sensor line
for measures, refer to error code 81
Bit 3
Valency
8
Curve too steep in terms of ramp speed
Check speed differential between the curvepoints and the modulating operating ramp setting
(parameter 544).
1. Modulating operating ramp 32 seconds
Curve slope max. 10% for LMV37.4 ramp of 20 seconds (20% for 10 seconds or 40% for 5
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