CHART CONTINUED FROM PREVIOUS PAGE
|
|
| Troubleshooting Chart for ECM Variable Speed Air Circulator Blower Motors |
| |||
|
|
|
| ||||
|
|
|
|
|
|
|
|
| Symptom |
| Fault Description(s) | Possible Causes | Corrective Action | Cautions and Notes |
|
|
|
|
|
|
|
|
|
|
|
|
|
| - Check low voltage (Thermostat) | - Turn power OFF prior to repair. |
|
|
|
| - Stays at low CFM despite | - 24 Vac wires miswired or loose. | wires and connections. | Wait 5 minutes after |
|
|
|
| - Verify fan is not in delay mode - | disconnecting power before |
| ||
|
|
| system call for cool | - "R" missing/not connected at motor. |
| ||
|
|
| wait until delay complete. | opening motor. |
| ||
|
|
| or heat CFM. | - Fan in delay mode. |
| ||
|
|
| - Perform motor/control replacement | - Handle electronic motor/control |
| ||
|
|
|
|
|
| ||
|
|
|
|
| check, ECM motors only. | with care. |
|
| - Motor starts, |
|
|
|
|
|
|
|
|
|
|
| - Turn power OFF prior to repair. |
| |
| but runs |
|
|
| - Is fan in delay mode? - wait until delay time complete. | Wait 5 minutes after |
|
| erratically. |
|
| - "R" missing/not connected at motor. | disconnecting power before |
| |
|
| - Stays at high CFM. | - Perform motor/control replacement check, ECM |
| |||
|
|
| - Fan in delay mode. | opening motor. |
| ||
|
|
|
| motors only. |
| ||
|
|
|
|
| - Handle electronic motor/control |
| |
|
|
|
|
|
|
| |
|
|
|
|
|
| with care. |
|
|
|
|
|
|
|
|
|
|
|
| - Blower won't shut off. | - Current leakage from controls | - Check for Triac switched t'stat | - Turn power OFF prior to repair. |
|
|
|
| into G, Y, or W. | or solid state relay. |
| ||
|
|
|
|
|
| ||
|
|
|
|
|
|
|
|
|
|
|
| - High static creating high blower speed. | - Check/replace filter. |
|
|
|
|
|
| - Incorrect supply or return ductwork. |
|
| |
|
|
| - Air noise. | - Check/correct duct restrictions. | - Turn power OFF prior to repair. |
| |
|
|
| - Incorrect or dirty filter(s). |
| |||
|
|
|
| - Adjust to correct blower speed setting. |
|
| |
|
|
|
| - Incorrect blower speed setting. |
|
| |
|
|
|
|
|
|
| |
|
|
|
|
|
|
|
|
|
|
|
| - Loose blower housing, panels, etc. | - Check for loose blower housing, |
|
|
| - Excessive |
|
| - High static creating high blower | panels, etc. |
|
|
|
| - Noisy blower or cabinet. | speed. | - Check for air whistling thru seams in | - Turn power OFF prior to repair. |
| |
| noise. |
|
| - Air leaks in ductwork, cabinets, | ducts, cabinets or panels. |
|
|
|
|
|
| or panels. | - Check for cabinet/duct deformation. |
|
|
|
|
|
|
|
|
|
|
|
|
|
| - High static creating high blower speed. | - Does removing panel or filter |
|
|
|
|
|
| reduce "puffing"? |
|
| |
|
|
| - "Hunts" or "puffs" at | - Incorrect or dirty filter(s). |
|
| |
|
|
| - Check/replace filter. | - Turn power OFF prior to repair. |
| ||
|
|
| high CFM (speed). | - Incorrect supply or return ductwork. |
| ||
|
|
| - Check/correct duct restrictions. |
|
| ||
|
|
|
| - Incorrect blower speed setting. |
|
| |
|
|
|
| - Adjust to correct blower speed setting. |
|
| |
|
|
|
|
|
|
| |
|
|
|
|
|
|
|
|
|
|
|
|
|
| - Turn power OFF prior to repair. |
|
|
|
| - Motor failure or |
|
| 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. |
| |
|
|
|
| ||||
|
|
| is present. |
|
| - Handle electronic motor/control |
|
|
|
|
|
|
| with care. |
|
|
|
|
|
|
|
|
|
| *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 | ||||||
29 | 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
