Broan ERV90HCT Troubleshooting, Problems Possible causes You should try this

11. TROUBLESHOOTING

If the integrated control LED of the unit is flashing, this means the unit sensors detected a problem. See the table below to know where on the unit the problem occurs.

LED flashes GREEN. LED flashes AMBER. LED flashes RED.

• Thermistor error.	Replace the entire port assembly (fresh air from outside port).
• Damper error.	Go to Point 6.

•The door is open and the unit is not unplugged. Close the door and press once on the integrated control push button to reset the unit.

• Exhaust motor error. Go to Point 5.

Problems Possible causes You should try this

1. Unit does not work. •The circuit board may be defective.

•Unplug the unit. Disconnect the main control and the auxiliary control(s) (if need be). Jump G and B terminals. Plug the unit back and wait about 10 seconds. If the motors run on high speed and the damper opens, the circuit board is not defective.

NO C NC I OC OL Y R G B

VE0097

2. The damper actuator	•The damper actuator or the integrated
does not work.	damper port mechanism may be defective.

•The circuit board may be defective.

•Unplug the unit. Disconnect the main control and the optional control(s) (if need be). Wait 10 seconds and plug the unit back. Check if the damper opens. If not, use a multimeter and check for 24V AC on J12-1 and J12-2 (in electrical compartment). If there is 24V AC, replace the entire port assembly. NOTE: It is normal to experience a small delay (7-8 seconds) before

detecting the 24V AC signal at starting-up. This signal will stay during 17-18 seconds before disappearing.

•If there is no 24V AC, replace the circuit board.

3.The wall control does not work OR the indicators flash.

•The wires may be in reverse position.

•The wires may be broken. •The wire in the wall OR the wall control may be defective.

•Ensure that the color coded wires have been connected to their appropriate places.

•Inspect every wire and replace any that are damaged.

•Remove the wall control and test it right beside the unit using another shorter wire. If the wall control works there, change the wire. If it does not, change the wall control.

4.The Humidity Control does not work OR the 20-minute push-button timer does not work OR its indicator light does not stay on.

•The wires may be in reverse position.

•The Humidity Control or push button may be defective.

•Ensure that the color coded wires have been connected to their appropriate places.

•Jump the OL and OC terminals. If	NO	C	NC	I	OC	OL	Y	R	G	B
the unit switches to high speed, remove
the Humidity Control or push button
and test it right beside the unit using
beside the unit using another VE0098

shorter wire. If it works here, change the wire. If it doesn’t, change the Humidity Control or the push button.

5.The supply and/or exhaust motor do not work.

•The circuit board may be defective.

•The motor(s) may be defective.

•Press on the integrated control push button until the unit turn on low speed (the LED will light AMBER). Using a multimeter, check the voltage on J4-1 and J4-2 (for supply motor), and on J5-1 and J5-2 (for exhaust motor). The reading must be ± 68 V AC. Then set the unit on high speed by pressing on the integrated control 1 more time (the LED will light GREEN). Using a multimeter, check the voltage on J4-1 and J4-2 (for supply motor), and on J5-1 and J5-2 (for exhaust motor). The reading must be ± 120 V AC if the fan motor speed setting is Low-High, or ± 90 V AC if the fan motor speed setting is Low-Medium. If all the readings correspond to the right voltage values, the circuit board is not defective. If one or both readings are different, change the circuit board.

•Using a multimeter, check the ohms value on each motor connectors. For BLUE and BLACK motor wires, the right value is ± 52 ohms. For BLUE and BROWN motor wires, the right value is ± 72 ohms. For BROWN and BLACK motor wires, the right value is ± 124 ohms. If the ohm values are the same, the motor is not defective. Replace the motor capacitor.

6.	The defrost cycle does not work •Ice deposits may be hindering		•Remove the ice.
	(the fresh air duct is frozen OR	the damper operation.
	the fresh air distributed
	is very cold.	•The damper rod or the port	•Inspect these parts and replace if necessary.
		damper itself may be broken.
		•The damper actuator or circuit board	•See point 2.
		may be defective.
7.	The integrated control	•The 30-second boot sequence	•See Section 4.1.1 Boot Sequence
	push button does not work.	is not completed.

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