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Burner Troubleshooting
SYMPTOM CAUSE REMEDY
Loud, high-pitched whine Flame is too rich. Verify pressure tap between gas valve
and blower inlet.
Turn to Page 19 and verify that the
gas
regulator setting is 0.2" (0.5cm) wc
below the blower inlet pressure.
Replace gas orifice with smaller size.
Flame is “fluttery.” Flame is too lean. Turn to Page 19 and verify that the
gas
Exhaust may have acrid regulator setting is 0.2" (0.5cm) wc
smell or burner may fail below the blower inlet pressure.
to stay lit.
Replace gas orifice with larger size.
Burner pulsates or Exhaust vent is too long. Reduce length of exhaust vent and/or
surges, especially on number of elbows.
ignition.
Combustion appears Flame current is not Check for wet or damaged igniter with
normal, but flame does being sensed. low resistance to ground. Replace with
not stay lit. new igniter.
Verify burner flameholder is properly
grounded.
Replace Ignition Control Module.
Heat Exchanger Troubleshooting
SYMPTOM CAUSE REMEDY
Boiling in heat exchanger. Low water flow to heater. Service pump and or filter.
May be accompanied by
Heat exchanger plugged. Service heat exchanger. Correct water
“bumping” sounds.
chemistry.
Bypass valve stuck open. Service bypass valve.
Thermal governor stuck Replace thermal governor.
closed.
Sweating. Thermal governor failed. Replace thermal governor.