CHART 4 - INDOOR UNIT COMMUNICATION ERROR SIZE 9K AND 12K

Check the wires and

No

Fix connection or

connections between

 

replace wiring

Indoor and outdoor units*

 

 

 

Notes:

Before measuring the Volts DC on outdoor TB, disconnect the field wire on terminal 1.

Yes

Reset main power and

No

restart system using remote.

 

Problem persists?

 

Yes

 

Measure Volts DC on

Yes

outdoor TB between 1 & 3.

 

Ok?**

 

No

 

.

 

Replace outdoor board.

 

No further action is

required

Measure Volts DC on indoor TB between 1 & 3.

Ok?**

No

Replace indoor board.

Before measuring the Volts DC on Indoor TB, disconnect the field wire on terminal 1.

Have the red probe of the meter on terminal 1 and the black probe on terminal 3. Reconnect wiring when measurements are complete.

Recheck wiring and connections

38/40MVC, MVQ

*Make sure wires are connected per connection diagrams. Failing to do that will result in a communication error.

**There is a 2 to 3 minute window to take the measurement before the diagnostic light is on again.

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Carrier 38MVQ, 40MVC, 38MVC, 40MVQ service manual Chart 4 Indoor Unit Communication Error Size 9K and 12K

40MVQ, 40MVC, 38MVQ, 38MVC specifications

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