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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
seconds)
2. Modulating operating ramp 48 seconds
Curve slope max. 10% for LMV37.4 ramp of 30 seconds (20% for 15 seconds or 30% for 10
seconds)
3. Modulating operating ramp 64 seconds
Curve slope max. 10% for LMV37.4 ramp of 40 seconds (20% for 20 seconds or 40% for 10
seconds)
→ Between the ignition point (P0) and the low-fire point (P1), the speed change in modulating
mode may be a maximum of 40%, independent of the LMV37.4 ramp.
4. The setting of the VSD ramp must be about 20% faster than the ramps in the LMV37.4
(parameters 522, 523).
Bit 4
Valency
16
Interruption of speed signal
No speed detected in spite of control.
1. Check if the motor turns.
2. Check if the speed sensor delivers a signal (LED / check distance from the sensor disk).
3. Check wiring of the VSD.
Bit 5
Valency
32
Quick shutdown due to excessive speed deviation
Speed deviation was for about 1 s >10% outside the anticipated range.
1. Check ramp times of the LMV37.4 and VSD.
2. Check wiring of the VSD.
Bit 6
Valency
64
Minimum speed fall below (phase-dependent)
1. Standby (phase 12): Check the setting for the minimum speed and maximum speed during
operation (parameter 669.0 / 669.1; MAX > MIN).
2. Check the speed recording (absolute speed parameter 935, standardized speed parameter
936).
3. Prepurge phase (phase 30): Read-in speed or prepurge speed (parameter 503.1 / 506.1)
below the minimum speed for prepurging (parameter 667).
4. Operating phases (phase 40...64): Read-in speed or setting of the speed curve below the
minimum speed in operation (parameter 669.0).
Bit 7
Valency
128
Maximum speed exceeded (phase-dependent)
1. Standby (phase 12): Setting preignition time (parameter gas 226 / 336 or oil 266 / 366) at least
3 seconds (or
parameter 665)
2. Standby (phase 12): Check the setting for the minimum speed and maximum speed during
operation (parameter 669.0 / 669.1; MAX > MIN).
3. Check the speed recording (absolute speed parameter 935, standardized speed parameter
936).
4. Preignition time (phase 38): Read-in speed or setting of the ignition speed (P0) above the
maximum speed for ignition (parameter 668).
5. Operating phases (phase 40...64): Read-in speed or setting of the speed curve above the
maximum speed in operation (parameter 669.1).
84 # Curve slope actuators
Bit 0 VSD: Curve too steep in terms of ramp speed
Check speed differential between the curvepoints and the modulating operating ramp setting
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