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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
87 # Error air actuator
0 Position error
Target position could not be reached within the required tolerance band.
1. Check to see if actuator is locked or overloaded.
Bit 0
Valency 1
Open-circuit
Open-circuit detected at the actuator’s terminals.
1. Check wiring (voltage X53 across pin 5 or 6 and pin 2 >0.5 V).
Bit 3
Valency
≥
8
Curve too steep in terms of ramp rate
The slope of the curve may be a maximum position change of 31° between 2 curvepoints in
modulating mode
Bit 4
Valency
≥
16
Sectional deviation in comparison with last referencing
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.
90 # Internal error basic unit
91 # Internal error basic unit
93 # Error flame signal acquisition
3 Short-circuit of sensor
Short-circuit at QRB...
1. Check wiring.
2. Flame detector possibly fault.
95 # Error relay supervision
3 Ignition transformer
4 Fuel valve 1
5 Fuel valve 2
6 Fuel valve 3
External power supply active contact Check wiring
96 # Error relay supervision
3 Ignition transformer
4 Fuel valve 1
5 Fuel valve 2
6 Fuel valve 3
Relay contacts have welded
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.
97 # Error relay supervision
0
Safety relay contacts have welded or external po wer
supply fed to safety relay
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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