SERVICING
43
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 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.
*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.
CHART CONTINUED FROM PREVIOUS PAGE.
Symptom Fault Description(s) Possible Causes Corrective Action Cautions and Notes
- Stays at high CFM.
- "R" missing/not connected at motor.
- Fan in delay mode.
- Is fan in delay mode? - wait until delay
time complete.
- Perform motor/control replacement check,
ECM motors only.
- Turn power OFF prior to repair.
Wait 5 minutes after disconnecting
power before opening motor.
- Handle electronic motor/control
with care.
- Blower won't shut off.
- Current leakage from controls
into G, Y, or W.
- Check for Triac switched t'stat or
solid state relay.
- Turn power OFF prior to repair.
- Air noise.
- High static creating high blower speed.
- Incorrect supply or return ductwork.
- Incorrect or dirty filter(s).
- Incorrect blower speed setting.
- Check/replace filter.
- Check/correct duct restrictions.
- Adjust to correct blower speed setting.
- Turn power OFF prior to repair.
- Noisy blower or cabinet.
- Loose blower housing, panels, etc.
- High static creating high blower speed.
- Air leaks in ductwork, cabinets,
or panels.
- Check for loose blower housing, panels, etc.
- Check for air whistling thru seams in ducts,
cabinets or panels.
- Check for cabinet/duct deformation.
- Turn power OFF prior to repair.
- "Hunts" or "puffs" at
high CFM (speed).
- High static creating high blower speed.
- Incorrect or dirty filter(s).
- Incorrect supply or return ductwork.
- Incorrect blower speed setting.
- Does removing panel or filter reduce "puffing"?
- Check/replace filter.
- Check/correct duct restrictions.
- Adjust to correct blower speed setting.
- Turn power OFF prior to repair.
- Evidence of
Moisture.
- Motor failure or
malfunction has
occurred and
moisture is present.
- Moisture in motor/control module. - Replace motor and perform Moisture Check.*
- Turn power OFF prior to repair.
Wait 5 minutes after disconnecting
power before opening motor.
- Handle electronic motor/control
with care.
- Excessive noise.
- Motor starts,
but runs
erratically.
TROUBLESHOOTING CHART FOR ECM VARIABLE SPEED AIR CIRCULATOR BLOWER MOTORS
To Next Page
Loading...
Need help?
General
