28

 

 

 

Troubleshooting Chart for ECM Variable Speed Air Circulator Blower Motors

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Symptom

 

Fault Description(s)

Possible Causes

Corrective Action

 

Cautions and Notes

 

 

- Motor rocks

 

- This is normal start-up for

----

----

 

----

 

 

 

slightly

 

 

 

 

 

 

variable speed motor.

 

 

 

 

when starting.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

- Manual disconnect switch off or

- Check 230 Vac power at motor.

 

 

 

 

 

 

 

 

door switch open.

- Check low voltage (24 Vac R to C) at motor.

- Turn power OFF prior to repair.

 

 

 

 

 

 

- Blown fuse or circuit breaker.

- Check low voltage connections

 

 

 

 

 

 

 

 

Wait 5 minutes after

 

 

 

 

 

- No movement.

- 24 Vac wires miswired.

(G, Y, W, R, C) at motor.

 

 

 

 

 

 

 

disconnecting power before

 

 

 

 

 

- Unseated pins in wiring

- Check for unseated pins in connectors

 

 

 

 

 

 

 

 

opening motor.

 

 

 

 

 

 

harness connectors.

on motor harness.

 

 

 

- Motor won't

 

 

 

- Handle electronic motor/control with care.

 

 

 

 

- Bad motor/control module.

- Test with a temporary jumper between R - G.

 

 

 

 

 

 

 

 

start.

 

 

- Moisture present in motor or control module.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

- Loose motor mount.

- Check for loose motor mount.

 

- Turn power OFF prior to repair.

 

 

 

 

 

- Motor rocks,

 

Wait 5 minutes after

 

 

 

 

 

- Make sure blower wheel is tight on shaft.

 

 

 

 

 

 

- Blower wheel not tight on motor shaft.

 

disconnecting power before

 

 

 

 

 

but won't start.

- Perform motor/control replacement check,

 

 

 

 

 

- Bad motor/control module.

opening motor.

 

 

 

 

 

 

ECM motors only.

 

 

 

 

 

 

 

 

 

- Handle electronic motor/control with care.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

- Motor

 

 

 

 

 

 

 

 

 

oscillates up &

 

- It is normal for motor to

 

 

 

 

 

 

 

down while

 

oscillate with

----

----

 

----

 

 

 

being tested

 

no load on shaft.

 

 

 

 

 

 

 

off of blower.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

- Variation in 230 Vac to motor.

- Check line voltage for variation or "sag".

 

 

 

 

 

 

 

 

- Unseated pins in wiring harness

- Check low voltage connections

 

 

 

 

 

 

 

- Varies up and down

connectors.

(G, Y, W, R, C) at

 

 

 

 

 

 

 

- Erratic CFM command from

motor, unseated pins in motor

 

- Turn power OFF prior to repair.

 

 

 

 

 

or intermittent.

 

 

 

 

 

 

"BK" terminal.

harness connectors.

 

 

 

 

- Motor starts,

 

 

 

 

 

 

 

 

- Improper thermostat connection or setting.

- Check-out system controls - Thermostat.

 

 

 

 

 

but runs

 

 

- Moisture present in motor/control module.

- Perform Moisture Check.*

 

 

 

 

 

erratically.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

- Incorrect or dirty filter(s).

- Does removing panel or filter

 

 

 

 

 

 

 

- "Hunts" or "puffs" at

reduce "puffing"?

 

 

 

 

 

 

 

- Incorrect supply or return ductwork.

- Check/replace filter.

 

- Turn power OFF prior to repair.

 

 

 

 

 

high CFM (speed).

 

 

 

 

 

 

- Incorrect blower speed setting.

- Check/correct duct restrictions.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

- Adjust to correct blower speed setting.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

*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 ECM variable speed motors are c

Important Note: Using the wrong motor/control module voids all product warranties and may produce unexpected results.

SERVICING

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Page 28
Image 28
Goodman Mfg R-410A manual Chart on Next

R-410A specifications

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