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Building Technologies Basic documentation LMV37.4... CC1P7546en
HVAC Products 28 Error code list 01.12.2009
Error
code
Diagnostic code Meaning for LMV37.4... system Recommended measures
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
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
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