Section V Technical Information; Nuisance Lockouts/Flame Sensing Problems - Wayne LC2300M Manual

A: NUISANCE LOCKOUTS/FLAME SENSING PROBLEMS
Wayne's LC2300M series gas burners utilize a flame rod or prove flame through the process of flame
rectification.
One of the most common problems with gas appliances utilizing this type of electronic flame sensing
system is the "nuisance lockout". Lockouts are not generally due to the burner failing to ignite, but
rather simply the failure of the system to sense the establishment of flame. Should this situation exist
for a period longer than the ignition control's preprogrammed lockout timing, the control will shut
down or go into permanent lockout. The only way to get the burner to re-cycle is to:
1. Press and hold the "Reset" button on the AZL control or the "Reset" switch on the control
box (if equipped) for 3 seconds.
The following situations can lead to flame sensing problems and can be checked without disassembling
the main burner:
1. The burner is not properly grounded to "earth ground".
2. The ignition control is not properly grounded to the burner itself. Using an ohmmeter,
check the wire attached to both parts for good contact and continuity.
3. The burner ignition control is polarity sensitive. The polarity of the incoming line voltage
may be reversed. Verify that black and white wires are hot and neutral respectively, and
that they are connected to the corresponding black and white wires on the burner.
The remaining checks and/or adjustments require removal of the gas train:
1. Electrical continuity from the "flame sense" terminal of the LMV3 control to the end of the
flame rod may be compromised. Check all quick-connect terminations and connections.
Check the continuity with an ohmmeter while flexing wires to assure no hidden conductor
breakage exists. If replaced, wiring must be of equal or heavier gauge and equal, or better
temperature rating.
2. The flame rod probe may be grounded out. Assure that the flame rod probe is not touching
the burner head. The probe should be positioned as indicated in Figure 20 below.
3. The flame rod probe should be free of soot and creosote. Deposits may insulate the probe,
making it difficult to pass the electrical charge to the flame. The probe can be cleaned with
steel wool, emery paper or fine sandpaper. NOTE: THIS IS THE LEADING CAUSE
OF NUISANCE LOCKOUTS IN DUAL-FUEL WOOD/GAS FIRED APPLIANCES.
4. The flame rod probe may be burned away. Check it against dimensions on the electrode
settings drawing. (Figure 21)
5. The dimensional location of the flame rod probe may be incorrect, or the probe may be
distorted. Check it against dimensions on the electrode settings drawing and adjust if
necessary. (Figure 21)
6. The spark electrode gap may be incorrect, resulting in no spark or an inadequate spark that
will not ignite the gas properly. Check the electrode gap against the electrode settings
drawing and adjust if required. (Figure 21)
63899-002 Rev. A 3/20/2024
SECTION V
TECHNICAL INFORMATION
53