Trane S9V2B040U3VSAE Installation, Operation And Maintenance Manual page 97

DEFINITION
RECYCLE Lock Out = 10 recycles within a single
call for heat. Lockout period is for one hour.
Flame is sensed & then lost
All gas appliances in the home should be turned
on to verify gas pressure
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
To measure flame current, use a VOM set to
DC micro-amps. Connect voltmeter leads in
series with flame sensor circuit, see
illustra on
S9V2-VS-SVX001-1B-EN
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
YES ~1.7"WC (NG)
~6.0"WC (LP)
YES
Posible Causes
Plugs
Blower door
YES
Wind gust
Condensate
Power interrupt
Repeat steps with
YES
nd
2 stage hea ng
Adjust manifold gas pressure to
~1.7"WC (NG)
NO
~6.0"WC (LP)
Check opera on
Is minimum outlet
gas manifold
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 outlet
gas manifold Correct incoming
NO
pressure gas supply pressure
maintained?
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
97