Amana ASXC16, Service And Troubleshooting

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SERVICING
37
NOTE: The UltraCheck-EZ™ diagnostic tool is
equipped with a non-replaceable fuse. Connecting the
tool to a source other than 24VAC could damage the
tool and cause the fuse to open. Doing so will render
the diagnostic tool inoperable.
6. Turn on power to air handler or modular blower.
WARNING
Line voltage now present
7. Depress the orange power button on the diagnostic tool
to send a run signal to the motor. Allow up to 5 seconds
for the motor to start.
NOTE: If the orange power button does not illuminate
when depressed, the tool either has an open fuse or is
not properly connected to a 24VAC source.
8. The green LED on the diagnostic tool will blink
indicating communications between the tool and motor.
See table below for indications of tool indicators and
motor actions. Replace or repair as needed.
Power
Button
Green
LED
Motor
Action
Indication(s)
OFF OFF
Not
Rotating
Confirm 24VAC to
UltraCheck-EZ
TM
tool.
If 24VAC is confirmed,
diagnostic tool is
inoperable.
ON Blinking Rotating
Motor and control/end
bell are functioning
properly.
ON OFF Rotating Replace motor
control/end bell.
ON Blinking
Not
Rotating
Check motor (see
Motor Checks
below).
ON OFF
Not
Rotating
Replace motor
control/end bell; verify
motor (see Motor
Checks
below).
9. Depress the orange power button to turn off motor.
10. Disconnect power. Disconnect diagnostic tool.
11. Reconnect the 4-wire harness from control board to
motor.
Electrical Checks - High Voltage Power Circuits
WARNING
High Voltage!
Disconnect all power before servicing
or installing. Multiple power sources
may be present. Failure to do so may
cause property damage, personal injury
or death.
1. Disconnect power to air handler or modular blower.
2. Disconnect the 5-circuit power connector to the ECM
motor.
3. Turn on power to air handler or modular.
WARNING
Line voltage now present
4. Measure voltage between pins 4 and 5 on the 5-circuit
connector. Measured voltage should be the same as
the supply voltage to the air handler or modular.
1
2
3
4
5
Lines 1 and 2 will be connected
for 12OVAC Power Connector
applications only
Gnd
AC Line Connection
AC Line Connection
}
5. Measure voltage between pins 4 and 3. Voltage should
be approximately half of the voltage measured in step 4.
6. Measure voltage between pins 5 and 3. Voltage should
be approximately half of the voltage measured in step 4.
7. If no voltage is present, check supply voltage to air
handler or modular blower.
8. Disconnect power to air handler or modular blower.
Reconnect the 5-circuit power harness disconnected in
step 2.