Lmv Errors - Bradford White Laars Linc MagnaTherm FT CFH1000 Installation And Operation Instructions Manual

Page 120
12.B LMV Errors.
In addition to the error messages displayed on the display unit, the LMV Status menu provides an Error Code and
corresponding Diagnostic Code associated with failures of the LMV controller. The following table provides an
abbreviated list of common LMV errors and corrective actions. For a complete listing of LMV errors please refer to the
LMV Technical Instructions which can be found at
http://www.scccombustion.com/pdf/LMV3 Technical Instructions LV3-1000 INDEXED.pdf
Error Diag.
Code Code
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
- No communication between the LMV3 and the AZL23
Comm
Any # No flame at the end of safety time (TSA)
1 No flame at the end of safety time 1 (TSA1)
2
2 No flame at the end of safety time 2 (TSA2)
4 No flame at the end of safety time 1 (TSA1) (software version ≤ V02.00)
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
Extraneous light during startup, air pressure, combustion pressure - start
4
24
prevention
66 Extraneous light during startup, POC - start prevention
70 Extraneous light during startup, air pressure, POC - start prevention
Extraneous light during startup, combustion pressure, POC - start
82
prevention
Extraneous light during startup, air pressure, combustion pressure, POC -
86
start prevention
Any # Loss of flame
0 Loss of flame
7
3 Loss of flame (software version ≤ V02.00)
3-255 Loss of flame due to TUV test (loss of flame test)
22
Any # Safety Loop
OFF S
50 Any # Internal error
51 Any # Internal error
55 Any # Internal error
56 Any # Internal error
57 Any # Internal error
58 Any # Internal error
Any # Internal error: No valid load controller source
0 Internal error: No valid load controller source
60
1 Analog output preset valid - prevention of startup
2 Analog output preset valid - default output low-fire
81 1 Interrupt limitation speed input
Any # Error during VSD's speed standardization
LMV Error Code List
Meaning for the LMV3
LAARS Heating Systems
Corrective Action
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.
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.
5. Low input voltage to LMV3 could cause a weak flame signal. Check
that voltage is 115-125 VAC.
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.
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.
An enable signal was received but the LMV will not startup due to a lack
of a safety signal from the Laars Linc
If the fault occurs continuously, replace the LMV3.
No valid 4-20 mA signal is present on terminal X64. This could be done on
purpose to create a low fire hold. Otherwise, check wiring of 4-20 mA
signal and ensure 4-20 mA source is valid. See diagnostic codes for more
information.
Reset the fault. If the fault occurs continuously, replace the LMV3.
No valid 4-20 mA signal is present on terminal X64 and parameter 204 is
set to 1, causing the lockout. Re-establish a valid 4-20 mA signal and reset
the fault.
No fault: No valid 4-20 mA signal is present on terminal X64 and
parameter 204 is set to 0, so the LMV3 is operating at low fire. The fault
message appears to alert the user that a low fire hold is enabled. To
enable modulation, re-establish a valid 4-20 mA signal.
The LMV3 has detected an interruption on the speed input. Decrease the
electrical noise on the speed sensor wires. If the fault occurs
continuously, replace the LMV3.
An error occurred while attempting to standardize the speed of the VSD.
See diagnostic codes for more information.