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T T r r o o u u b b l l e e s s h h o o o o t t i i n n g g
DEFINITION
RETRY Lock Out = 3 unsuccessful tries for igni on
within a single call for heat. Lockout period is for
one hour
Flame has never been sensed
Turn all gas
appliances on
Possible causes
Burner alignment
Dirty burners
Low manifold
There are two flame sense pads located on the IFC,
marked "FP". To measure flame current, use a VOM set
to DC volts. Flame current will vary depending on the
type of meter used. Typical flame current ranges from
0.75 – 3.0 micro-amps (0.75 – 3.0 VDC)
62
Is inlet gas pressure above
13.8" WC or less than
nameplate minimum ?
NO
Cycle power to furnace.
Connect manometer to
manifold pressure
connector and call for
st
1 stage heat
Does gas ignite?
YES
Do all burners
NO
ignite within 4
seconds?
pressure
YES
Measure flame
current. Is flame
current less than 0.5
micro-amp?
NO
Flame sensor is good
2.1 Fault Code
Disconnect electrical
power to furnace.
Connect manometer
to inlet gas pressure
connector
Correct inlet gas pressure.
YES
Maximum pressure is 13.8"WC
Check opera on
Is any gas
pressure
NO
present?
YES
NO
Is manifold pressure
~1.7"WC (NG)
NO
~6.0"WC (LP)
**
YES
Check igniter
posi on and correct
if needed. Check
opera on
Possible Causes
Dirty Sensor
Dirty burners
YES
Poor grounding
Sensor loca on
Wire connec ons
Possible causes
Switch OFF?
No voltage to GV
Debris in gas valve
Adjust manifold gas pressure to
~1.7"WC (NG)
~6.0"WC (LP)
Check opera on
**
**
S8B1/S8X1 manifold pressure
~3.5" WC (NG)
~10" WC (LP)
S8XB-SVX001-1C-EN
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