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TROUBLESHOOTING
GUIDE
Flame
Sensor
Check
5E
5I
5F
Is resistance
less than
NO
Measure continuity from
50 megohms
(50,000,000
Ohms)?
YES
5G
Disconnect lead
from flame sensor.
Connect ohmmeter
from sensor to
burner ground.
5H
Is resistance
NO
less than
50 megohms?
YES
Replace sensor.
Energize system.
Check operation.
194
CHART 5
5A
5B
Does main
Does ignitor remain
YES
burner remain
energized with
lit?
flame present?
NO
De-energize system.
Disconnect 12-pin
connector. Connect
ohmmeter from flame
sensor pin FP to
burner GROUND.
5L
Disconnect AC power to
system at main fuse or
Disconnect flame
circuit breaker. Connect
sensor from wire.
voltmeter from control
terminal LINE NEUTRAL
wire end to FP pin
to BURNER GROUND.
on 12-pin connector.
Energize module.
5J
5K
Is sensor
YES
lead good?
NO
Connect ground
Repair or
wire from burner to
replace wire.
12-pin connector
Energize system.
terminal GROUND.
Check operation.
Check operation.
Replace flame
sensor lead. Check
operation.
WARNING
!
If diagnostic indicator (LED)
shows continuous flashing, turn
off gas supply at source before
disconnecting electrical power!
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INTEGRATED FURNACE
5C
Is blower
at heat speed
NO
within 1 minute
of burner ignition?
YES
5D
Is 120V
present at
control terminals
HEAT & CIR
NEUTRAL?
5M
Is 120V
present at
burner ground?
YES
5N
Is
Connect a microammeter
control
in series with flame
ground wire
sensor and sensor
connected to
lead. Energize system.
burner
Measure current when
ground?
burner ignites.
NO
5O
Is 1 microamp
or more
present?
Replace control.
Check operation.
CONTROL MODULE
System is
YES
functioning
properly.
NO
Repair wiring
and/or replace
YES
indoor blower
motor. Check
operation.
NO
Replace control
module. Check
operation.
Reverse 120V
LINE & NEUTRAL
YES
wires. Energize
system. Check
operation.
NO
Clean surface of
flame sensor with
fine steel wool.
Reinstall. Check
operation.
YES
5P
Remove
sensor.
NO
Does sensor
have carbon or
dust buildup?
YES
NO
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