Amana GUIA Series Service Instructions Manual page 134

Troubleshooting Chart for ECM/ICM Variable Speed Air Circulator Blower Motors
Symptoms of
Abnormal Fault Description(s)
Operation
- Motor rocks slightly - This is normal start-up for
when starting. variable speed motor.
- No movement.
- Motor won't start.
- Motor rocks, but won't start.
- Motor oscillates up &
- It is normal for motor to oscillate
down while being
with no load on shaft.
tested off of blower.
- Varies up and down or intermittent.
- "Hunts" or "puffs" at high CFM
(speed).
- Motor starts, but runs
erratically.
- Stays at low CFM despite system
call for cool or heat CFM.
- Stays at high CFM.
- Blower won't shut off.
- Air noise.
- Excessive noise.
- Noisy blower or cabinet.
- "Hunts" or "puffs" at high CFM
(speed).
- Motor failure or malfunction has
- Evidence of Moisture. occurred and moisture is
present.
*Moisture Check
- Connectors are oriented "down" (or as recommended by equipment manufacturer).
- Arrange harnesses with "drip loop" under motor.
- Is condensate drain plugged?
- Check for low airflow (too much latent capacity).
- Check for undercharged condition.
- Check and plug leaks in return ducts, cabinet.
Note: You must use the correct replacement control/motor module since they are factory programmed for specific operating modes. Even though they look alike, different modules may have completely different
functionality. The ICM-2 variable speed motors are currently the only motors that can have the motor/control module replaced.
Important Note: Using the wrong motor/control module voids all product warranties and may produce unexpected results.
Possible Causes
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- Check 115 Vac power at motor.
- Manual disconnect switch off or door switch open. - Check low voltage (24 Vac R to C) at motor.
- Blown fuse or circuit breaker. - Check low voltage connections (G, Y, W, R, C) at motor.
- 24 Vac wires miswired. - Check for unseated pins in connectors on motor harness.
- Unseated pins in wiring harness connectors. - Test with a temporary jumper between R - G.
- Bad motor/control module. - Check motor for tight shaft.
- Moisture present in motor or control module. - Perform motor/control replacement check, ICM-2 motors only.
- Run Moisture Check.*
- Loose motor mount. - Check for loose motor mount.
- Blower wheel not tight on motor shaft. - Make sure blower wheel is tight on shaft.
- Bad motor/control module. - Perform motor/control replacement check, ICM-2 motors only.
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- Variation in 115 Vac to motor. - Check line voltage for variation or "sag".
- Unseated pins in wiring harness connectors. - Check low voltage connections (G, Y, W, R, C) at
- Erratic CFM command from "BK" terminal. motor, unseated pins in motor harness connectors.
- Improper thermostat connection or setting. - Check-out system controls - Thermostat.
- Moisture present in motor/control module. - Perform Moisture Check.*
- Does removing panel or filter reduce "puffing"?
- Incorrect or dirty filter(s).
- Check/replace filter.
- Incorrect supply or return ductwork.
- Check/correct duct restrictions.
- Incorrect blower speed setting.
- Adjust to correct blower speed setting.
- 24 Vac wires miswired or loose. - Check low voltage (Thermostat) wires and connections.
- "R" missing/not connected at motor. - Verify fan is not in delay mode - wait until delay complete.
- Fan is delay mode. - Perform motor/control replacement check, ICM-2 motors only.
- "R" missing/not connected at motor. - Is fan in delay mode? - wait until delay time complete.
- Fan is delay mode. - Perform motor/control replacement check, ICM-2 motors only.
- Current leakage from controls into G, Y, or W. - Check for Triac switched t'stat or solid state relay.
- High static creating high blower speed.
- Check/replace filter.
- Incorrect supply or return ductwork.
- Check/correct duct restrictions.
- Incorrect or dirty filter(s).
- Adjust to correct blower speed setting.
- Incorrect blower speed setting.
- Check for loose blower housing, panels, etc.
- Loose blower housing, panels, etc.
- Check for air whistling thru seams in ducts, cabinets or
- High static creating high blower speed.
panels.
- Air leaks in ductwork, cabinets, or panels.
- Check for cabinet/duct deformation.
- High static creating high blower speed. - Does removing panel or filter reduce "puffing"?
- Incorrect or dirty filter(s). - Check/replace filter.
- Incorrect supply or return ductwork. - Check/correct duct restrictions.
- Incorrect blower speed setting. - Adjust to correct blower speed setting.
- Moisture in motor/control module. - Replace motor and perform Moisture Check.*
Corrective Action
----
- Turn power OFF prior to repair. Wait 5
minutes after disconnecting power before
opening motor.
- Handle electronic motor/control with care.
- Turn power OFF prior to repair. Wait 5
minutes after disconnecting power before
opening motor.
- Handle electronic motor/control with care.
----
- Turn power OFF prior to repair.
- Turn power OFF prior to repair.
- Turn power OFF prior to repair. Wait 5
minutes after disconnecting power before
opening motor.
- Handle electronic motor/control with care.
- Turn power OFF prior to repair. Wait 5 minutes after disconnecting power
before opening motor.
- Handle electronic motor/control with care.
- Turn power OFF prior to repair.
- Turn power OFF prior to repair.
- Turn power OFF prior to repair.
- Turn power OFF prior to repair.
- Turn power OFF prior to repair. Wait 5 minutes after disconnecting power
before opening motor.
- Handle electronic motor/control with care.
Cautions and
Notes
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