A7 - Fuse Chart

Unit Size

 

Fuse Rating (Amps/Volts)

 

Indoor

Outdoor

Outdoor

 

009

---

3.15A/250V

2A/250V

012

---

3.15A/250V

2A/250V

018

3.15A/250V

3.15A/250V

---

024

3.15A/250V

3.15A/250V

---

The 3.15A fuses protect the board against the indoor or outdoor fan motors.

 

 

The 2A fuses protect the board against a Class II circuit board failure.

 

 

A8 - Indoor Unit Diagnostic Guides

9K & 12K Units

Operation

Timer

Failure Mode

Diagnostic

Lamp

Lamp

Chart

 

l

X

Indoor fan speed has been out of control for over 1 minute

1

l

On

Indoor room temp. or evaporator sensor is open circuit or short circuited

2

X

l

Compressor over--- current protection has been activated four times

3

On

l

EPROM error*

---

l

l

Indoor unit communication error (Illuminates simultaneously)

4

 

 

 

 

18K & 24K Units

 

 

 

 

 

 

 

Opera-

Timer

Defrosting

Auto

 

Diagnostic

tion

Failure Mode

Lamp

Lamp

Lamp

Chart

Lamp

 

 

 

 

 

 

l

l

l

l

Over--- current protection of the compressor occurs four times

3

X

l

X

X

Indoor room temp. sensor is open circuit or short circuited

2

l

X

X

X

Temp. sensor on indoor evaporator is open circuit or short circuited

2

X

X

l

X

Temp. sensor on outdoor condenser is open circuit or short circuited (not

2

cooling only modes)

 

 

 

 

 

X

X

l

l

Outdoor unit protects (outdoor temp. sensor, phase order, etc.)

5

X

l

X

l

EPROM error*

---

X

X

X

l

Indoor unit communication error

6

l= Flashing

X = Off

* = Replace Indoor Board

Infrared signal receptor

Infrared signal receptor

 

 

 

 

 

OPERATION AUTO

TIMER

PRE.-DEF.

OPERATION AUTO

TIMER OPERATION

 

 

 

TIMER

 

 

 

 

PRE-DEF

 

 

A07546a

ECON

PRE-DEF

 

 

 

 

A07544

 

 

 

 

A07545a

 

 

 

Model size 009

Model size 012

Model size 018-024*

*PRE-DEF light will illuminate when the unit is running in FAN ONLY mode on Cooling Only units.

Fig. 34 – LED Display Panel

38/40MVC, MVQ

A9 - Outdoor Unit Diagnostic Guides

Flashing

 

 

Diagnostic

Times after 2

 

Failure Mode

 

Chart

Second Off

 

 

 

 

 

5

Communication failure

 

4 or 6

2

Condenser temperature sensor failure

 

2

1

Other indoor failure

 

If the unit is operating normally, the LED light on the outdoor board is lit continuously. If there is a failure, the LED light will flash a specific number of times. Refer to the Outdoor Unit Diagnostic table above to determine failure.

43

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Carrier 40MVQ, 40MVC, 38MVQ, 38MVC service manual 9K & 12K Units, 18K & 24K Units

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.

One of the standout features of these models is their high energy efficiency ratings. Both the 38MVC and 38MVQ boast Seasonal Energy Efficiency Ratios (SEER) that exceed industry standards, delivering substantial energy savings over time. The 40MVC and 40MVQ models also continue this trend, featuring enhanced efficiency that translates into lower utility bills and a reduced carbon footprint.

These air-conditioning units utilize Carrier's innovative inverter technology, which allows for variable speed operation. This means that the compressor can adjust its speed according to the cooling demand, resulting in smoother temperature control and less energy consumption. The inverter technology not only maximizes comfort but also contributes to quieter operation, as the systems can run at lower speeds when full capacity is not required.

In addition to efficiency, the Carrier 38MVC, 38MVQ, 40MVC, and 40MVQ are equipped with advanced filtration systems. These systems work to purify the air by reducing allergens and pollutants, ensuring a healthier indoor environment. Some models also come equipped with smart connectivity options, allowing users to control their air conditioning remotely via a smartphone app. This feature adds convenience and helps monitor energy usage effectively.

With durable construction and high-quality components, these units are designed to withstand the test of time, reducing the need for frequent repairs or replacements. They are also built to operate quietly, so they can provide comfort without disturbing the peace of the indoor environment.

In terms of installation flexibility, the Carrier 38MVC, 38MVQ, 40MVC, and 40MVQ can be easily integrated into various existing HVAC systems, thanks to their compatible size and design. This adaptability makes them suitable for a wide range of applications, from small residential homes to larger commercial spaces.

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.