CHART 6 - INDOOR UNIT COMMUNICATION ERROR SIZE 18K AND 24K

Check the wires and

No

connections between

 

Indoor and outdoor units*

 

Yes

 

Reset main power and

No

restart system using remote.

 

Problem persists?

 

Yes

 

Measure VDC reading on

No

outdoor between S and G.

 

Reading positive? **

 

Yes

.

Replace indoor board.

Fix connection or replace wiring

No further action is

required

Replace outdoor board

Notes:

When unit is operating normally and a DC voltage reading is taken between the S and G terminal on the outdoor unit (or indoor unit) positive and negative readings will fluctuate between 0 and 24V DC.

If indoor board is bad, only a positive readings will be registered between terminals S and G on the outdoor unit. The reverse will apply if outdoor board is bad (only negative readings will register).

Above data is obtained by having the red probe of the meter on the S terminal and the black probe on the G terminal.

38/40MVC, MVQ

*Make sure wires are connected per connection diagrams i.e. L1 to L1 and L2 to L2. Failing to do that will result in a communication error.

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

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Carrier 40MVQ, 40MVC, 38MVQ, 38MVC service manual Chart 6 Indoor Unit Communication Error Size 18K and 24K
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40MVQ, 40MVC, 38MVQ, 38MVC specifications

The Carrier 38MVC, 38MVQ, 40MVC, and 40MVQ are advanced air-conditioning systems designed for both residential and commercial applications. These units are recognizable for their commitment to efficiency, reliability, and comfort, making them ideal choices for various environments.

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Overall, the Carrier 38MVC, 38MVQ, 40MVC, and 40MVQ models are engineered with cutting-edge technologies that prioritize efficiency, comfort, and ease of use, making them an excellent choice for those looking to enhance their indoor climate control solutions.
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