Carrier HRVCCSHB1100 Troubleshooting, Erv / Hrv, Possible causes, You should try this

ERV / HRV

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.

Table 5 – Troubleshooting

LED flashes GREEN.

Thermistor error.

Reference Table 6 for proper temperature vs. resistance relationship. If thermistor

is defective, replace the entire port assembly (fresh air from outside port).

LED flashes RED.

The door is open and the unit is not

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

unplugged.

unit.

Exhaust motor error.

Go to Problem 5 below.

LED flashes AMBER.

Damper error.

Go to Problem 6 below.

Problem:

Possible causes:

You should try this:

1. Unit does not work.

S

The circuit board may be defective.

S Unplug the unit. Disconnect the main

control and the optional control(s) (if need

NO

C

NC

I

OC

OL

Y

R

G

B

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.

2. The damper actuator

S

The damper actuator or the integrated

S Unplug the unit. Disconnect the main control and the optional controls(s) (if need

does not work.

damper port mechanism may be

be).Wait 10 seconds and plug the unit back. Check if the damper opens. If not,

defective.

use a multimeter and check for 24VAC on J12 -1 and J12 -2 (in electrical

compartment). If there is 24VAC, replace the entire port assembly.

NOTE: It is normal to experience a small delay (7-8 seconds) before detecting

the 24VAC signal at starting-up. This signal will stay during 17-18 seconds

before disappearing.

S

The circuit board may be defective.

S

If there is no 24VAC, replace the circuit board.

3. The wall control does

S

The wires may be in reverse position.

S

Ensure that the color coded wires have been connected to their work OR its

not work OR its indi-

indicator flashes. appropriate places.

cator flashes.

S

The wires may be broken.

S

Inspect every wire and replace any that are damaged.

S

The wire in the wall OR the wall.

S

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

may be defective. shorter wire. If the wall control works there, change the wire. If

it does not, change the wall control.

4. The

dehumidistat

S

The wires may be in reverse position.

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

does

not

work OR

places.

the 20-minute. push-

S

The dehumidified or push button may be

S

Jump the OL and OC terminals. If the unit

button timer does not

defective.

switch to high speed, remove the

NO

C

NC

I

OC

OL

Y

R

G

B

work OR its indicator

dehumidistat or push button and test it right

light

does

not

stay

beside the unit using another shorter wire. If

on.

it works here, change the wire. If it doesn’t,

change the dehumidistat or the push button.

5. The

supply and/or

S

The circuit board may be defective.

S

Press on the integrated control push button until the unit turn on low speed (the

exhaust motor do not

LED will light AMBER). Using a multimeter, check the voltage on J4-1 and

work.

J4-2 (for supply motor), and on J5-1 and J5-2 (for exhaust motor). The reading

must be ± 68VAC. 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 ± 120VAC. 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.

S

The motor(s) may be defective.

S Using a multimeter, check the ohms value on each motor connectors. Black

motors values: For BLUE and BLACK motor wires, the right value is ± 55 ohms.

For BLUE and BROWN motor wires, the right value is ± 35 ohms. For BROWN

and BLACK motor wires, the right value is ± 89 ohms. Aluminum motors values:

For BLUE and BLACK motor wires, the right value is ± 51 ohms. For BLUE and

BROWN motor wires, the right value is ± 47 ohms. For BROWN and BLACK

motor wires, the right value is ± 98 ohms. If he ohms values are the same, the

motor is not defective. Replace the motor capacitor.

6. The

defrost

cycle

S Ice deposits may be hindering the

S

Remove the ice.

does

not

work

(the

damper operation.

fresh air duct is fro-

S

The damper rod or the port damper itself

S

Inspect these parts and replace if necessary.

zen OR the fresh air

distributed

is

very

may be broken.

cold. (See Table 7 for

S The damper actuator or circuit board

S

See Problem 2.

Defrost Cycle

Tim-

ing.)

may be defective.

7. The integrated con-

S

The 30 -second boot sequence is not

S

See Boot Sequence.

trol push button does

completed.

not work.

10