STA-RITE Sr200na, Sr200lp,, Sr333na, Sr333lp,, Sr400na, Sr400lp Owner's Manual page 30

Burner Troubleshooting
SYMPTOM
Loud, high-pitched whine
Flame is "fluttery."
Exhaust may have acrid
smell or burner may fail
to stay lit.
Burner pulsates or
surges, especially on
ignition.
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.
Exhaust vent is too long.
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.
30
REMEDY
Verify pressure tap between gas valve
and blower inlet.
Turn to Page 19 and verify that the gas
regulator setting is 0.2"wc below the
blower inlet pressure.
Replace gas orifice with smaller size.
Turn to Page 19 and verify that the gas
regulator setting is 0.2"wc below the
blower inlet pressure.
Replace gas orifice with larger size.
Reduce length of exhaust vent and/or
number of elbows.
Check for wet or damaged igniter with
low resistance to ground. Replace with
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.
Replace thermal governor.
Replace thermal governor.