Mitsubishi Electronics MXZ-24UV - E2 service manual Troubleshooting check table, Lev

Page 25

12-3. Troubleshooting check table

Note . LED indicates "00" in the normal status.

7-segment LED display

Error mode

00

Normal

❈If there is defect in the following parts(electronic control P.C. board, relay P.C. board, high pressure switches(63H1,63H2),indoor /outdoor fan motor , or indoor coil thermistor), the compressor may stop even with the display remained at “ 00 “.In any case, reset the breaker and check the above-stated parts.

Symptom

 

Outdoor unit does not operate.

 

 

 

 

 

Display

Detecting method

Detecting method

Check points

 

 

 

 

a4

Outdoor power system abnor-

When the compressor operation has been interrupted by overcurrent

• Inverter output

(A4)

mality

protection continuously three times within 1 minute after start-up, the

• Compressor

 

compressor stops operation.

 

 

 

 

 

a3

Outdoor electronic control P.C.

When the nonvolatile memory data cannot be read properly on the out-

• Outdoor electronic control P.C. board

(A3)

board abnormality

door controller board

 

 

 

 

 

p1

Indoor unit and LEV abnor-

When the drain abnormality is detected in the indoor unit and the indoor

• Check the abnormality indication on the

main coil temperature is too low, or when any abnormality is detected in

indoor unit.

(P1)

mality

the components of indoor unit

• LEV

 

 

 

 

 

 

 

 

 

Symptom

 

Outdoor unit stops and restarts every 3 minutes.

 

 

 

 

 

Display

Detecting method

Detecting method

Check points

 

 

 

 

 

 

 

• Check the characteristic of the evapora-

e9

Evaporation temperature ther-

The compressor stops when a short or open circuit occurs in the evap-

tion temperature thermistor. Refer to F

(E9)

mistor abnormality

oration temperature thermistor during compressor running.

on page 31.

• Check the contact of P. C. board con-

 

 

 

 

 

nectors.

 

 

 

 

 

 

 

• Check the characteristic of the discharge

e6

Discharge temperature ther-

The compressor stops when a short or open circuit occurs in the dis-

temperature thermistor. Refer to F on

(E6)

mistor abnormality

charge temperature thermistor during compressor running.

page 31.

• Check the contact of P. C. board con-

 

 

 

 

 

nectors.

 

 

 

 

f8

 

 

• Check the characteristic of the fin temper-

Fin temperature thermistor

The compressor stops when a short or open circuit occurs in the fin tem-

ature thermistor. Refer to F on page 31.

(F8)

abnormality

perature thermistor during compressor running.

• Check the contact of P.C. board connec-

 

 

tors.

 

 

 

 

 

 

 

 

 

 

• Check the inverter and compressor.

 

 

 

Refer to E on page 30.

a8

Overcurrent protection

When over current is applied to the power module, the compressor

• Check the amount of gas.

(A8)

stops and restarts in 3 minutes.

• Check the indoor/outdoor air flow for

 

short cycle.

 

 

 

 

 

• Check the indoor unit air filter for

 

 

 

clogging.

 

 

 

 

d6

Discharge temperature over-

When the discharge temperature thermistor detects 116˚C or above, the

• Check the amount of gas and the refriger-

compressor stops and restarts operation in 3 minutes.

ant cycle.

(d6)

heat protection

(Protection will be released at 100; or below.)

• Check the outdoor unit air passage.

 

 

 

 

 

d4

 

 

• Check the outdoor unit air passage.

Fin temperature overheat pro-

When the fin temperature thermistor detects 89˚C or above, the com-

• Check the power module.

(d4)

tection

pressor stops and restarts operation in 3 minutes.

• Check the outdoor fan motor. Refer to G

 

 

on page 31.

 

 

 

 

 

 

 

d7

High pressure protection

When the compressor starts, primary current or output voltage stops the

• Amount of gas

(d7)

compressor and restarts in 3 minutes.

• Outdoor unit air passage.

 

• Check the ball valve.

 

 

 

 

 

 

f5

Room-A gas pipe temperature

When a short or open circuit occurs in the Room-A gas pipe

• Room A gas pipe temperature thermistor

characteristic.

(F5)

thermistor abnormality

temperature thermistor.

• Contact of P.C. board connectors.

 

 

 

 

 

 

f6

Room-B gas pipe temperature

When a short or open circuit occurs in the Room-B gas pipe

• Room B gas pipe temperature thermistor

characteristic.

(F6)

thermistor abnormality

temperature thermistor.

• Contact of P.C. board connectors.

 

 

 

 

 

 

f7

Room-C gas pipe temperature

When a short or open circuit occurs in the Room-C gas pipe

• Room C gas pipe temperature thermistor

characteristic.

(F7)

thermistor abnormality

temperature thermistor.

• Contact of P.C. board connectors.

 

 

 

 

 

 

25

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Contents MXZ-24UV E1 MXZ-24UV E2 ContentsMXZ-24UV E1 MXZ-24UV E2 Technical ChangesOutdoor Unit Part Names and FunctionsOutdoor Unit Indoor / Outdoor Correspondence Table07+07 Indoor Units Combination1930 7.2 470-2300 MXZ-24UV E1 , MXZ-24UV E2 SpecificationHeating DB Test conditions Cooling DB35 WB240dB = Band Center FREQUENCIES, HzUnit mm Outlines and DimensionsSG79A845H01 Wiring DiagramUnitmm Refrigerant System DiagramCWB Capacity and the Input CurvesCDB Class unit in single operation Capacity and input correction by inverter output frequency33Hz Ambient temperature/ Ambient humidity% Or any button on remote controllerAmbient temperature Heat operation33Hz CurrentOutdoor 45Hz 10 15 20 Inverter Multi System Control Microprocessor ControlSSR61 LEV control Cool DRY Heat CorrectionSuction superheat S.H LEV opening Min Max Operational frequency rangeMin Max Rated DRY CoolHeat defrosting control Discharge temperature protection controlHigh pressure protection Outdoor fan control Refrigerant recovery control on heatingRelation between main sensor and actuator Relation between main sensor and actuatorInstruction of troubleshooting TroubleshootingBefore troubleshooting, check the following Lead wiring Housing point Troubleshooting procedureLEV Troubleshooting check tableOutdoor unit operates Trouble criterion of main parts Outdoor unit does not operate. LED display Outdoor unit does not operate. LED display display OFFWhen cooling operation does not work. Start When heating operation does not work. StartTurned off, disconnect the connector Power supply of outdoor unit wasCheck the resistance Minutes or more normal Relay P. C. boardLED Return CN722 to former InfinityElectronic control P.C.board Test Point Diagram and Voltage MXZ-24UV E1 , MXZ-24UV E2Outdoor FAN 230V AC Reversing Valve 230V AC Noise filter P.C.board MXZ-24UV E1MXZ-24UV E2 Relay P.C.board MXZ-24UV E1 MXZ-24UV E2 M P.C.board MXZ-24UV E1 MXZ-24UV E2Outdoor Unit Operating Procedure Photos Disassembly InstructionsRemoving the compressor Photo Discharge pipe brazed part Suction pipe braxed partRemoving the fan motor 1Remove the service panel.See PhotoRemoving the 4-way valve Photo 1Remove the screws of the top panel , and remove it.SeeRemoving the reactor Operating Procedure PhotosOutdoor Unit Functional Parts MXZ-24UV E1 Parts List6 7 Outdoor Unit Structural Parts MXZ-24UV E1Accessory Parts MXZ-24UV E1 MXZ-24UV E2 MXZ-24UV MAC-855SG MXZ-24UV51H-855 Page Made in Japan

MXZ-24UV - E2, MXZ-24UV specifications

Mitsubishi Electronics has established itself as a leader in the HVAC (heating, ventilation, and air conditioning) industry with its MXZ-24UV and MXZ-24UV - E2 models. These multi-zone heat pump systems are designed to provide exceptional efficiency, comfort, and versatility for residential and commercial applications.

One of the main features of the MXZ-24UV is its ability to effectively cool and heat multiple rooms simultaneously. This system allows for the connection of up to four indoor units, enabling users to customize the climate in different spaces while maintaining energy efficiency. This zoning capability ensures you can maintain the perfect temperature in each room according to the occupants' preferences.

The MXZ-24UV incorporates advanced inverter technology, which allows the compressor to adjust its speed based on the required heating or cooling demand. This results in reduced energy consumption compared to conventional systems, providing significant savings on energy bills while also promoting a more consistent indoor temperature. The inverter-driven compressor operates quietly and efficiently, making it a suitable choice for residential areas.

Additionally, these models are equipped with a range of smart technologies. The built-in Wi-Fi capability allows homeowners to control the system remotely using a smartphone or tablet. This feature adds convenience and flexibility, enabling users to adjust settings from anywhere, ensuring their space is at the desired temperature upon arrival.

Durability is another essential characteristic of the MXZ-24UV and MXZ-24UV - E2 models. Mitsubishi has designed these units to withstand various weather conditions, enhancing longevity and reliability. The units feature a robust construction that minimizes wear and tear while ensuring dependable performance year after year.

Moreover, the system has a variety of indoor unit options, including wall-mounted, ceiling-mounted, and floor-mounted designs. This versatility makes it easy to integrate into different architectural styles and preferences, ensuring both aesthetics and functionality.

In summary, the Mitsubishi Electronics MXZ-24UV and MXZ-24UV - E2 models are designed for those seeking energy efficiency, flexibility, and durability in a multi-zone heating and cooling system. With advanced inverter technology, smart home capabilities, and a range of indoor unit styles, these systems offer exceptional comfort while minimizing energy costs, making them a top choice in the HVAC market.
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