CleaverBrooks ProFire Q Series, Installation Operation & Maintenance

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Troubleshooting
6-4
750-437
Q Series Full Modulation
6.4 — LMV3 Diagnostics
he LMV3 has an extensive list of fault codes to help clarify the nature of any fault. This section describes every
fault code in detail and gives guidance on how to correct it.
When a lockout occurs, the AZL will alternate between displaying “Loc:c” and “Loc:d”. The number listed after
“Loc:c” is the error code, and the number listed after “Loc:d” is the diagnostic code. For example, an error code
3, diagnostic code 0 will alternate between displaying “Loc:c: 3” and “Loc:d: 0”.
If a fault occurs that does not cause a lockout, the AZL will alternate between displaying “InF:c” and “InF:d”. The
number listed after “InF:c” is the error code, and the number listed after “InF:d” is the diagnostic code. These
faults are intended to provide the user information even though a lockout did not occur.
The fault history is stored in the 700 set of parameters. The LMV3 stores the last 25 fault codes:
Parameter 701 displays information about the current status of the LMV3.
Parameter 702 displays information about the most recent fault.
Parameter 703 displays information about the second most recent fault.
…
Parameter 725 displays information about the 24th most recent fault.
Burner Stays in Low Fire 1. Pressure or temperature above modulating control setting.
2. Defective modulating control.
Shutdown Occurs During
Firing
1. Loss or stoppage of fuel supply.
2. Defective fuel valve, loose electrical connection.
3. Flame detector weak or defective.
4. Scanner lens dirty or sight tube obstructed.
5. If the LMV3 does not show a fault code, check the limit circuit for an opened safety
control.
6. If the LMV3 shows a safety lockout (fault code):
a. Check fuel line and valves.
b. Check flame detector.
c. Check for open circuit in running interlock circuit.
d. The flame failure light is energized by ignition failure, main flame failure,
inadequate flame signal, or open control in the running interlock circuit.
7. Improper air/fuel ratio (lean fire).
a. Fluctuating fuel supply.
Temporary obstruction in the fuel line.
Temporary drop in gas pressure.
8. Interlock device inoperative or defective.
AZL display is blank The AZL connection to the controller requires both the RJ11 crossover adapter and RJ11
cable. The AZL display remains blank if the crossover adapter is not used.
Problem Possible Causes