STA-RITE SRC400NA - Burner Troubleshooting; Heat Exchanger Troubleshooting

SECTION SEVEN – Troubleshooting
7-9
Burner Troubleshooting
SS
SS
YY
YY
MM
MM
PP
PP
TT
TT
OO
OO
MM
MM
CC
CC
AA
AA
UU
UU
SS
SS
EE
EE
RR
RR
EE
EE
MM
MM
EE
EE
DD
DD
YY
YY
Loud, high-pitched whine Flame is too rich. Verify pressure tap between gas valve
and blower inlet.
Verify gas regulator setting 0.2" wc
below blower inlet pressure.
Replace gas orifice with ss
ss
mm
mm
aa
aa
ll
ll
ll
ll
ee
ee
rr
rr
size.
Adjust CO
2
to 8%-9% for natural gas.
9.2%-10.5% for propane.
Flame is “fluttery.” Flame is too lean. Verify gas regulator setting 0.2" wc
Exhaust may have acrid below blower inlet pressure.
smell or burner may fail
Replace gas orifice with ll
ll
aa
aa
rr
rr
gg
gg
ee
ee
rr
rr
size.
to stay lit.
Adjust CO
2
to 8%-9% for natural gas.
9.2%-10.5% for propane.
Burner pulsates on 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
SS
SS
YY
YY
MM
MM
PP
PP
TT
TT
OO
OO
MM
MM
CC
CC
AA
AA
UU
UU
SS
SS
EE
EE
RR
RR
EE
EE
MM
MM
EE
EE
DD
DD
YY
YY
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.