INTEGRATED FURNACE |
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| TROUBLESHOOTING |
CONTROL MODULE |
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| GUIDE |
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| CHART 5 |
Flame
Sensor
Check
5A5B
Does main | YES | Does ignitor remain | |
burner remain | energized with | ||
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lit? |
| flame present? | |
NO |
| YES |
5E
| 5C |
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| Is blower |
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NO | at heat speed | YES | |
within 1 minute | |||
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| of burner ignition? |
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NO
System is
functioning
properly.
5F
Is resistance
less than
50megohms (50,000,000
Ohms)?
YES
5G
Disconnect lead
from flame sensor. Connect ohmmeter from sensor to burner ground.
Disconnect
5I
| Disconnect flame | |
NO | sensor from wire. | |
Measure continuity from | ||
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| wire end to FP pin | |
| on | |
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5J
Is sensor | YES |
lead good? |
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NO |
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5L
Disconnect AC power to system at main fuse or circuit breaker. Connect voltmeter from control terminal LINE NEUTRAL to BURNER GROUND. Energize module.
5K YES Is
control
ground wire connected to burner ground?
NO
5D
Is 120V
present at
control terminals YES HEAT & CIR NEUTRAL?
NO
5M
Is 120V
present at YES burner ground?
NO
5N
Connect a microammeter
in series with flame sensor and sensor lead. Energize system. Measure current when burner ignites.
5O
Repair wiring and/or replace indoor blower motor. Check operation.
Replace control module. Check operation.
Reverse 120V
LINE & NEUTRAL
wires. Energize system. Check operation.
Clean surface of flame sensor with fine steel wool. Reinstall. Check operation.
5P YES
TECHNICAL HELP
5H
Is resistance
less than
50 megohms?
YES
Replace sensor. Energize system. Check operation.
Repair or | Connect ground | |
wire from burner to | ||
replace wire. | ||
Energize system. | ||
terminal GROUND. | ||
Check operation. | ||
Check operation. | ||
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NO
Replace flame
sensor lead. Check
operation.
Is 1 microamp | NO | |
or more | ||
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present? |
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YES |
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Replace control.
Check operation.
Remove
sensor.
Does sensor
have carbon or
dust buildup?
NO
!WARNING
If diagnostic indicator (LED)
shows continuous flashing, turn off gas supply at source before disconnecting electrical power!
264 |