Broan ERV90HCT, HRV90HT 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.

•Damper error.

•The door is open and the unit is not unplugged.

•Exhaust motor error.

Replace the entire port assembly (fresh air from outside port).

Go to Point 6.

Close the door and press once on the integrated control push button to reset the unit.

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	NO	C	NC	I	OC	OL	Y	R	G	B
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 VE0097
damper opens, the circuit board is not defective.

2. The damper actuator does

• The damper actuator or the

• Unplug the unit. Disconnect the main control and the optional control(s) (if

not work.

integrated damper port

need be). Wait 10 seconds and plug the unit back. Check if the damper

mechanism may be defective.

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.

• The circuit board may

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

be defective.

3. The wall control does not

• The wires may be in reverse

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

work OR the indicators

position.

places.

flash.

• The wires may be broken.

• Inspect every wire and replace any that are damaged.

• The wire in the wall OR the wall

• Remove the wall control and test it right beside the unit using another shorter

control may be defective.

wire. If the wall control works there, change the wire. If it does not, change

the wall control.

4. The Humidity Control does

• The wires may be in reverse

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

not work OR the

position.

places.

20-minute push-button

• The Humidity Control or push

• Jump the OL and OC terminals. If the unit

timer does not work OR

button may be defective.

switches to high speed, remove the

NO

C

NC

I

OC

OL

Y

R

G

B

its indicator light

Humidity Control or push button and test it

does not stay on.

right beside the unit using another shorter

wire. If it works here, change the wire. If it

VE0098

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

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