(2)If the self-diagnostics function fails to operate Check the indoor unit.

Is the fuse blown?

Normal

Replace the controller.

No indicators illuminate and the indoor fan does not rotate.

Check the power voltage.

Blown

Replace the circuit board or the fuse.

8-3. Checking the Indoor and Outdoor Units

(1) Checking the indoor unit

No.

Control

Check items (unit operation)

1

Use the remote controller to operate the

The rated voltage must be present between inter-unit wirings 1 and 2.

 

unit in "TEST run" mode. To determine

Connect a 5 k ohm resistor between inter-unit wirings 2 and 3. When the

 

whether the mode is currently in

voltage at both ends is measured, approximately 12 to 15V DC must

 

"TEST run" mode, check the 3 indicator

be output and the multimeter pointer must bounce once every 8

 

lamps on the unit. If all 3 are blinking,

seconds.

 

the current mode is "TEST run."

Or instead of measuring the voltage, you can insert an LED jig and

 

 

check that the LED flickers once every 8 seconds.

If there are no problems with the above, then check the outdoor unit.

For the "Test run" procedure, refer to the Appendix B "Installation Instructions".

(2) Checking the outdoor unit

 

 

 

 

No.

Control

Check items (unit operation)

1 Apply the rated voltage between outdoor

The control panel LED (red) must illuminate.

 

unit terminals L and N.

 

2Short-circuit the outdoor unit COM terminal The compressor, fan motor and 4-way valve must all turn on. to the T-RUN terminal.

If there are no problems with the above, then check the indoor unit.

Using the TEST/T-RUN terminals

 

TEST/T-RUN terminals

 

 

 

 

 

 

 

 

 

 

T-RUN : Test run (compressor and fan motor turn ON).

 

 

 

 

 

 

 

 

 

 

TEST/MV : Compresses time to 1/60th (accelerates

 

 

 

 

 

 

 

 

 

 

operation by 60 times faster than normal).

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

(TEST)/MV

 

T-RUN

 

COM

33

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Sanyo XMS1272 Checking the Indoor and Outdoor Units, Replace the controller, Replace the circuit board or the fuse

XMS1272, XMS0972 specifications

The Sanyo XMS0972 and XMS1272 are remarkable air conditioning units that blend efficiency with cutting-edge technology. Designed for residential and commercial spaces, these models promise comfort while optimizing energy consumption.

One of the standout features of both the XMS0972 and XMS1272 is their advanced inverter technology. This feature allows the units to adjust their cooling capacity based on the room's ambient temperature. As a result, the air conditioners can maintain a consistent temperature without the frequent on/off cycles associated with traditional units. This not only ensures a more stable climate but also significantly reduces energy consumption, making them eco-friendly options.

Another significant characteristic is the Quiet Operation mode. Both models are engineered with noise reduction technology, providing a tranquil environment for users. This is particularly beneficial for bedrooms, offices, or libraries where noise levels can be a concern. The XMS models operate at a whisper-quiet level, allowing users to focus on their tasks or enjoy a peaceful night's sleep without disruption.

The Sanyo XMS0972 and XMS1272 also feature a user-friendly digital interface. With an intuitive remote control and an easy-to-read display, setting your desired temperature or switching modes has never been easier. Moreover, the smart diagnostic capability allows for quick troubleshooting, helping to identify any issues to ensure peak performance throughout their lifespan.

Both models are equipped with a 24-hour timer, adding convenience for users who wish to come home to a pre-cooled or heated environment. This feature enhances comfort and saves energy when the unit is not in use.

In terms of design, the Sanyo XMS units boast a sleek and modern aesthetic that seamlessly integrates into various interior styles. Their compact size allows for flexible installation options, making them suitable for various living and working spaces.

The XMS line also emphasizes air purification, incorporating advanced filters that capture dust, allergens, and other pollutants. This results in not just temperature control but also improved air quality, contributing to a healthier living environment.

In conclusion, the Sanyo XMS0972 and XMS1272 air conditioning units stand out for their energy efficiency, quiet operation, user-friendly features, and air purification capabilities. These characteristics make them an ideal choice for individuals and businesses looking for reliable and sophisticated climate control solutions.