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Building Technologies Basic documentation LMV37.4... CC1P7546en
HVAC Products 28 Error code list 01.12.2009
28 Error code list
Error
code
Diagnostic code Meaning for LMV37.4... system Recommended measures
no
Comm
No communication between LMV37.4... basic unit
and AZL2...
Check wiring for open-circuit / loose contact
2 # No flame at the end of the safety time (TSA)
1 No flame at the end of safety time 1 (TSA1)
2 No flame at the end of safety time 2 (TSA2)
3 # Air pressure failure
0 Air pressure off
1 Air pressure on
4 Air pressure on – start prevention
4 # Extraneous light
0 Extraneous light during startup
1 Extraneous light during shutdown
2 Extraneous light during startup – start prevention
7 # Loss of flame
0 Loss of flame
3
Loss of flame (software version
≤
V02.00)
3...255 Loss of flame during TÜV test
Diagnostics covers the period of time from shutdown of the fuel valves to the point in time loss of
flame is detected (resolution 0.2 s
→ value 5 = 1 s)
12 # Valve proving
0 Fuel valve 1 (V1) leaking
Check to see if valve on the gas side is leaking
Check to see if there is an open-circuit
1 Fuel valve 2 (V2) leaking
Check to see if valve on the burner side is leaking
Check to see if pressure switch for the valve proving is closed when gas pressure is present
Check wiring to see if there is a short-circuit
14 # POC
0 POC open Check to see if the valve’s closing contact is closed
1 POC closed
Check wiring
Check to see if the valve’s closing contact opens when valve is controlled
64 POC open – prevention of startup
Check wiring to see if there is an open-circuit.
Check to see if the valve’s closing contact is closed
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