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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
3...255 Loss of flame due to TÜV test (loss-of-flame test)
Diagnostics corresponds to the period of time from shutdown of fuel valves to the detection of loss
of flame (increment 0.2 s
Value 5 = 1 s)
12 # Valve proving
0
Fuel valve V1 leaking
(fuel valve V2 with valve proving via X5-01)
For valve proving via X5-01 (gas pressure switch-min)
Check to see if the valve on the burner side is leaking
Check to see if the pressure switch for the valve proving is closed when gas pressure is
present
Check wiring to see if there is a short-circuit
1
Fuel valve V2 leaking
(fuel valve V1 with valve proving via X5-01)
For valve proving via X5-01 (gas pressure switch-min)
Check to see if the valve on the gas side is leaking
Check wiring to see if there is a short-circuit
2 Valve proving not possible
Valve proving activated, but pressure switch-min selected as input function for X9-04 (check
parameters 238 and 241)
3 Valve proving not possible
Valve proving activated, but no input assigned (check parameters 236 and 237)
4 Valve proving not possible
Valve proving activated, but 2 inputs assigned (set parameter 237 to pressure switch-max or POC)
5 Valve proving not possible
Valve proving activated, but 2 inputs assigned (check parameters 236 and 237)
81 V1 leaking
Check to see if the valve on the gas side is leaking
Check wiring to see if there is an open-circuit
83 V2 leaking
Check to see if the valve on the burner side is leaking
Check to see if the pressure switch for the leakage test is closed when gas pressure is present
Check wiring for short-circuit
Check whether the gas pressure is present if the gas pressure switch-min was mounted after
the fuel valves.
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 a line interruption.
Check to see if the valve’s closing contact is closed
18 # Air pressure fault (speed-dependent air pressure switch)
0 Air pressure off
Check the setting for parameter 671.
Air pressure switch (X5-02) must report an ON signal above the configured ON threshold.
1 Air pressure on
Check the setting for parameter 670.
Air pressure switch (X5-02) must report an OFF signal below the configured OFF threshold.
128 Invalid parameterization
Check the setting of the speed thresholds (parameter 671 > 670).
19
80 Combustion pressure, POC – start prevention
Check to see if pressure switch has closed with no combustion pressure present
Check wiring for short-circuit
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