A.O. Smith 200M - Manual (Page 27)

27
CHART 2
S8600 (NATURAL GAS AND LP GAS)
INTERMITTENT PILOT SYSTEM TROUBLESHOOTING
PILOT BURNER LIGHTS BUT MAIN BURNER DOES NOT LIGHT
Does the pilot flame cover 3/8” to 1/2”
of igniter/sensor rod?
Does spark stay on for more than 30 seconds
after the pilot is “proven” (lit)?
Is the pilot burner ignition cable in good
condition (not brittle, burnt, or cracked)?
Are the ceramic insulators surrounding the
igniter/sensor rod in good condition
(not broken or cracked)?
Are the igniter/sensor rod in good
condition (not worn, corroded, sooted
or damaged)?
Replace ignition module.
Correct the situation by consulting the
installation or user’s manual on how to
adjust pilot flame.
Is voltage (24 Vac) across terminals
MV & MV/PV?
Are the wires securely attached to the main
valve operator on the gas control and to
terminals MV & MV/PV on ignition module?
Replace
ignition
module.
Replace main gas valve.
Replace pilot burner.
Replace pilot burner.
Clean rod or replace
pilot burner if necessary.
Attach
wires
firmly.
YES
YES
YES
YES
YES
NO
NO
NO
NO
NO
NO
NO