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Burner Troubleshooting
SYMPTOM
Loud, high-pitched
whine
Flame is "fluttery ."
Exhaust may have acrid
smell or burner may fail
to stay lit.
Combustion appears
normal, but flame does
not stay lit.
Heat Exchanger Troubleshooting
SYMPTOM
Boiling in heat
exchanger. May be
accompanied by
"bumping" sounds.
Sweating.
CAUSE
Flame is too rich.
Flame is too lean.
Flame current is not
being sensed.
CAUSE
Low water flow to
heater.
Heat exchanger
plugged.
Bypass valve stuck
open.
Thermal governor
stuck closed.
Thermal governor
failed.
REMEDY
Verify pressure tap between gas valve and
blower inlet.
Verify that the gas regulator setting is 11 ±
5 Pa.
Contact a qualified technician or service
agency to replace the gas orifice.
Verify that the gas regulator setting is 11 ±
5 Pa.
Contact a qualified technician or service
agency to replace the gas orifice.
Check for wet or damaged igniter with low
resistance to ground. Replacewith new
igniter.
Verify burner flameholder is properly
grounded.
Replace Ignition Control Module.
REMEDY
Service pump and or filter.
Service heat exchanger. Correct water
chemistry.
Service bypass valve.
Replacethermal governor.
Replacethermal governor.
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Table of Contents
Troubleshooting
