43
Service Facts
X343070P08
VS No Air Flow / Incorrect Air Flow
NO
Is the ICM “fan”
LED on?
YES
YES
Verify that dip-switch settings are
correct for the system installed.
AND
Validate low-voltage wiring is
configured for system installed.
Is 24 VAC measured
between “G” and “B/C” at the
low voltage connections?
Check thermostat
and wiring to
thermostat.
Is line voltage measured at the
motor per Figure 1?
NO
Repair line voltage
wiring.
YES
Perform “GO” / “NO GO” test per
Figure 2.
Does the motor run?
YES
Replace control
board.
NO
Perform “GO” / “NO GO”
test per Figure 3
Does the motor run?
YES
Replace Wire
harness
NO
Is 24 VAC measured
between “R” (transformer
hot) and “B/C” (transformer
common) at the low voltage
field connections?
NO
Replace
transformer.
NO
Repair wiring
between incoming
power supply and
transformer.
Is fuse blown? YES Replace fuse.
NO
Is the proper line
voltage present at
the transformer?
YES
YES
Remove motor module and ohm
motor windings
Are motor windings ok (See Note 1)?
NO Replace motor
YES
Replace motor
module
NO
NO
NOTE 1:
1) Equal phase to phase
resistance.
2) No short to motor case.
Does system have
proper air flow?
Check for dirty air filter, duct
work damage or restrictions
around the air handler coil and
repair as needed.
Done
NO
YES
NO
Is the fan wheel
running?
YES
Does the CFM light flash
rate match programmed
air flow?
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