Meaning for the LMV3 System Corrective Action
Note: Diagnostic codes are additive. If a diagnostic code appears that is not on this list, it is a combination of multiple diagnostic codes.
Any # Extraneous light
0 Extraneous light during startup
1 Extraneous light during shutdown
2 Extraneous light during startup - prevention of startup
6 Extraneous light during startup, air pressure - start prevention
18 Extraneous light during startup, combustion pressure - start prevention
24
Extraneous light during startup, air pressure, combustion pressure - start
prevention
66 Extraneous light during startup, POC - start prevention
70 Extraneous light during startup, air pressure, POC - start prevention
82
Extraneous light during startup, combustion pressure, POC - start
prevention
86
Extraneous light during startup, air pressure, combustion pressure, POC -
start prevention
Any # Loss of flame
0 Loss of flame
3 Loss of flame (software version ≤ V02.00)
3-255 Loss of flame due to TUV test (loss of flame test)
Any # Valve proving
A fault occurred related to valve proving. See diagnostic codes for more
0 Fuel valve 2 (V2) leaking
The downstream gas valve failed valve proving with the low gas switch
doubling as the valve proving switch (parameter 236 = 2). See diagnostic
code 83 for corrective action.
1 Fuel valve 1 (V1) leaking
The upstream gas valve failed valve proving with the low gas switch
doubling as the valve proving switch (parameter 236 = 2). See diagnostic
code 81 for corrective action.
2 Valve proving not possible
3 Valve proving not possible
An extraneous light (flame signal present when input should be de-
energized) fault occurred.
1) Ensure that the source of light is not a flame. If it is, take corrective
action immediately.
2) Ambient light can cause an extraneous light fault. Ensure the flame
scanner is viewing a dark area such as the inside of a boiler.
3) UV scanners typically fail on (give a false flame signal). Remove UV
flame scanner and cover the bulb to ensure it is not seeing any light.
Check parameter 954 to see if the LMV3 is registering a flame signal. If it
is, replace the UV scanner.
Diagnostic code 2 - A call for heat was received, but the LMV3 will not start
up due to an extraneous light fault.
Diagnostic codes 6 and higher - A call for heat was received, but the LMV3
will not start up due to an extraneous light fault. Other inputs besides
the flame signal input are in the wrong state as well. The diagnostic code
calls out what other inputs are in the wrong state.
12
1) Increase the setting of parameter 186:01 (fuel 0) or 187:01 (fuel 1). This
increases the FFRT. A maximum setting of 30 equals a 4 second FFRT.
2) Check the flame detector signal in the presence of a known flame
source. Replace the flame detector if it does not produce the anticipated
signal.
Valve proving is activated, but no input is assigned for the valve proving
switch.
7
4
Section 6 Page 3 SCC Inc.
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