Troubleshooting Guide - Electronic - Lennox ADAGIO-MN Care And Operation Instructions Manual

TROUBLESHOOTING GUIDE - ELECTRONIC GAS CONTROL SYSTEM
Note: Before troubleshooting the gas control system, Ensure external gas shut off valve, located at gas supply inlet, (and wall switch, iff applicable), is
in the "ON" position.
Important: Valve system troubleshooting should only be accomplished by a qualified service technician.
SYMPTOM
1. Nothing happens when ON/OFF switch is
turned on (pilot does not spark).
. The main burner does not light and the
igniter is sparking.
. The main burner come "ON" but then go
"OFF".
4. The log and glass soot.
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POSSIBLE CAUSES
A. Low voltage/or bad lead wires.
B. Damaged igniter wire.
C. Damaged pilot assembly.
D. On/Off switch defective
A. No fuel supply.
B. Loose sensor wire.
C. Loose wires to valve.
D. Air in the gas line.
E. Low voltage.
A. Gas supply is turned "OFF".
B. Loose wire connection on valve or
ignition module.
C. Flame does not engulf flame sensor.
D. Obstructed vent system.
A. Flame impingement on the log.
B. Improper air shutter opening.
CORRECTIVE ACTION
Check voltage on AC terminals of module. The value
should be around 24 VAC. Confirm that wire con-
nections are secure.
Check for visible cracked casing, cuts, etc.
Check pilot assembly for visibly broken spark elec-
trode, etc.
Check switch and connections. Replace switch, if
necessary.
Ensure that the gas supply is turned on.
Ensure sensor wire connection is secure to purple
wire of ignition control.
Ensure blue and white (2) wires connection is secure
to valve.
Purge gas line of air.
Test voltage at AC terminals of module for 24 VAC.
If no voltage, replace module.
Check electrical connections between module and gas
control. If okay, replace gas control (valve).
Turned gas supply to "ON".
Check wire connection.
Check location of sensor.
Check vent system for obstructions.
Check for proper log placement.
Check for proper air shutter openings.