Trane S8V2A040M3PC Installation, Operation And Maintenance Manual page 62

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
RECYCLE Lock Out = 10 recycles within a single
call for heat. Lockout period is for one hour.
Flame is sensed & then lost
Turn all gas
appliances on
Measure flame current. Is
flame current greater
than 0.75 micro-amp?
(0.75-3 µA = Normal)
NO
Possible Causes
Dirty Sensor
Dirty burners
Poor grounding
Sensor loca on
Wire connec ons
DEFINITION
st
1 Stage Gas Valve not energized when it should
be 10 mes within the same call for heat .
24VAC not sensed on MVL 10 mes
62
2.2 Fault Code
Disconnect electrical
power to furnace.
Connect manometer
to manifold pressure
connector
NO
Cycle power to
furnace and call for
st
1 stage heat
Is manifold pressure
~1.7"WC (NG)
YES
~6.0" WC (LP)
**
YES
Possible Causes
Plugs
Blower door
Wind gust
Condensate
Power interrupt
Repeat steps with
nd
2 stage hea ng
2.3 Fault Code
Replace IFC
Adjust manifold gas pressure to
~1.7"WC (NG)
NO
~6.0" WC (LP)
Check opera on
Is minimum outlet
gas manifold
YES
pressure
maintained?
NO
Disconnect electrical
power to furnace.
Connect manometer to
inlet gas pressure
connector
Cycle power to
furnace and call for
st
1 stage heat
Is minimum inlet
gas manifold
YES NO
pressure
maintained?
Correct incoming
gas supply pressure
S8V2-SVX001-1A-EN