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| Troubleshooting Chart for ECM Variable Speed Air Circulator Blower Motors | |||
| Symptom |
| Fault Description(s) | Possible Causes | Corrective Action | Cautions and Notes |
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| - Check low voltage (Thermostat) | - Turn power OFF prior to repair. |
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| - Stays at low CFM despite | - 24 Vac wires miswired or loose. | wires and connections. | Wait 5 minutes after |
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| - Verify fan is not in delay mode - | disconnecting power before | ||
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| system call for cool | - "R" missing/not connected at motor. | ||
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| wait until delay complete. | opening motor. | ||
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| or heat CFM. | - Fan in delay mode. | ||
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| - Perform motor/control replacement | - Handle electronic motor/control | ||
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| check, ECM motors only. | with care. |
| - Motor starts, |
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| - Turn power OFF prior to repair. | |
| but runs |
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| - Is fan in delay mode? - wait until delay time complete. | Wait 5 minutes after |
| erratically. |
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| - "R" missing/not connected at motor. | disconnecting power before | |
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| - Stays at high CFM. | - Perform motor/control replacement check, ECM | |||
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| - Fan in delay mode. | opening motor. | ||
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| motors only. | ||
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| - Handle electronic motor/control | |
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| with care. |
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| - Blower won't shut off. | - Current leakage from controls | - Check for Triac switched t'stat | - Turn power OFF prior to repair. |
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| into G, Y, or W. | or solid state relay. | ||
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| - High static creating high blower speed. | - Check/replace filter. |
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| - Incorrect supply or return ductwork. |
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| - Air noise. | - Check/correct duct restrictions. | - Turn power OFF prior to repair. | |
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| - Incorrect or dirty filter(s). | |||
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| - Adjust to correct blower speed setting. |
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| - Incorrect blower speed setting. |
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| - Loose blower housing, panels, etc. | - Check for loose blower housing, |
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| - Excessive |
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| - High static creating high blower | panels, etc. |
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| - Noisy blower or cabinet. | speed. | - Check for air whistling thru seams in | - Turn power OFF prior to repair. | |
| noise. |
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| - Air leaks in ductwork, cabinets, | ducts, cabinets or panels. |
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| or panels. | - Check for cabinet/duct deformation. |
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| - High static creating high blower speed. | - Does removing panel or filter |
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| reduce "puffing"? |
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| - "Hunts" or "puffs" at | - Incorrect or dirty filter(s). |
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| - Check/replace filter. | - Turn power OFF prior to repair. | ||
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| high CFM (speed). | - Incorrect supply or return ductwork. | ||
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| - Check/correct duct restrictions. |
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| - Incorrect blower speed setting. |
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| - Adjust to correct blower speed setting. |
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| - Motor failure or |
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| - Turn power OFF prior to repair. |
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| Wait 5 minutes after | |
| - Evidence of |
| malfunction has | - Moisture in motor/control module. | - Replace motor and perform | disconnecting power before |
| Moisture. |
| occurred and moisture | Moisture Check.* | opening motor. | |
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| is present. |
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| - Handle electronic motor/control |
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| with care. |
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| *Moisture Check | oriented "down" (or as recommended by equipment manufacturer). | - Arrange harnesses with "drip loop" under motor. |
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| - Connectors are |
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| - Is condensate drain plugged? |
| - Check for low airflow (too much latent capacity). |
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| - Check for undercharged condition. |
| - Check and plug leaks in return ducts, cabinet. |
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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 ECM variable speed motors are c
Important Note: Using the wrong motor/control module voids all product warranties and may produce unexpected results.
SERVICING
