Troubleshooting
6-6
750-437
Q Series Full Modulation
6.4.1 — LMV3 Complete Error Code List
(from Siemens LMV3 Technical Instruction 7/19/17; used by permission)
TABLE 6- 2.
LMV3 Error Codes
Error
Code Diag. Code Description
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.
no
Comm
-
No communication between the LMV3
and the AZL23
Check for a loose connection between the LMV3 and AZL23. If the connection is good,
replace the cable connecting the LMV3 to the AZL23. If that does not fix the issue, replace
the AZL23.
2
Any #
No flame at the end of safety time (TSA) A flame failure occurred during lightoff.
1. Check the wiring of the ignition transformer, pilot valve, and main valve(s).
2. Check manual shutoff valves for the pilot gas and main gas.
3. Check the position of the air damper and close it further if necessary. The pilot flame
might be getting blown out.
4. 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.
1
No flame at the end of safety time 1
(TSA1)
2
No flame at the end of safety time 2
(TSA2)
4
No flame at end of safety time 1 (TSA1)
(software version V02.00)
3
Any #
Air pressure failure
A fault occurred related to the air pressure switch input X3-02.1. See diagnostic codes for
more information.
0
Air pressure off
The air pressure switch input was de-energized when it should have been energized. Make
sure the blower starts in phase 22 and the switch setpoint is set appropriately.
1
Air pressure on
The air pressure switch input was energized when it should have been de- energized. Make
sure the blower turns off in phase 78 and the switch setpoint is set appropriately. If
necessary, increase the setting of parameter 213.
2
Evaluation of air pressure
Check the setting of parameter 235/335. This can only be set to 2 on pneumatic fuel train
options.
4
Air pressure on - prevention of startup
The air pressure switch input is energized, preventing the LMV3 from starting up. If other
inputs besides the air pressure switch input are in the wrong state, causing a start
prevention, the diagnostic code calls out what other inputs are in the wrong state.
20
Air pressure, combustion pressure - start
prevention
68
Air pressure, POC - start prevention
84
Air pressure, combustion pressure, POC -
start prevention
4
Any #
Extraneous light
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.
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
Summary of Contents for ProFire Q Series
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Page 18: ...Introduction 1 8 750 437 Q Series Full Modulation...
Page 28: ...Installation 2 10 750 437 Q Series Full Modulation...
Page 50: ...Operation 3 22 750 437 Q Series Full Modulation...
Page 82: ...Troubleshooting 6 24 750 437 Q Series Full Modulation...
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