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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
					- 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.

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