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Aa44, Aa3 3, Pp11 – MITSUBISHI ELECTRIC MXZ-32SV User Manual

Page 26: Ee9 9, Ee6 6, Ff8 8, Aa8 8, Dd6 6, Dd44, Dd77

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26

Outdoor power system abnor-
mality

When the compressor operation has been interrupted by overcurrent
protection continuously three times within 1 minute after start-up, the
compressor stops operation.

• Inverter output
• Compressor

Display

Detecting method

Detecting method

Check points

Symptom

Outdoor unit does not operate.

Note . LED indicates "

00

" in the normal status.

7-segment LED display

Error mode

Normal

Outdoor electronic control P.C.
board abnormality

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

• Outdoor electronic control P.C. board

Indoor unit and LEV abnor-
mality

When the drain abnormality is detected in the indoor unit and the indoor
main coil temperature is too low, or when any abnormality is detected in
the components of indoor unit

• Check the abnormality indication on the

indoor unit.

• LEV

Display

Detecting method

Detecting method

Check points

Symptom

Outdoor unit stops and restarts every 3 minutes.

Evaporation temperature ther-
mistor abnormality

The compressor stops when a short or open circuit occurs in the evap-
oration temperature thermistor during compressor running.

• Check the characteristic of the evapora-

tion temperature thermistor. Refer to

F

F

on page 32.

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

nectors.

Discharge temperature ther-
mistor abnormality

The compressor stops when a short or open circuit occurs in the dis-
charge temperature thermistor during compressor running.

• Check the characteristic of the discharge

temperature thermistor. Refer to

F

F

on

page 32.

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

nectors.

Fin temperature thermistor
abnormality

The compressor stops when a short or open circuit occurs in the fin tem-
perature thermistor during compressor running.

• Check the characteristic of the fin temper-

ature thermistor. Refer to

F

F

on page 32.

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

tors.

Overcurrent protection

When over current is applied to the power module, the compressor
stops and restarts in 3 minutes.

• Check the inverter and compressor.

Refer to

E

E

on page 31.

• Check the amount of gas.
• Check the indoor/outdoor air flow for

short cycle.

• Check the indoor unit air filter for

clogging.

Discharge temperature over-
heat protection

When the discharge temperature thermistor detects 116˚C or above, the
compressor stops and restarts operation in 3 minutes.
(Protection will be released at 100

;

or below.)

• Check the amount of gas and the refriger-

ant cycle.

• Check the outdoor unit air passage.

Fin temperature overheat pro-
tection

When the fin temperature thermistor detects 89˚C or above, the com-
pressor stops and restarts operation in 3 minutes.

• Check the outdoor unit air passage.
• Check the power module.
• Check the outdoor fan motor. Refer to

G

G

on page 32.

00

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.

a

a44

(A4)

a

a3

3

(A3)

p

p11

(P1)

e

e9

9

(E9)

e

e6

6

(E6)

f

f8

8

(F8)

a

a8

8

(A8)

d

d6

6

(d6)

d

d44

(d4)

High pressure protection

When the compressor starts, primary current or output voltage stops the
compressor and restarts in 3 minutes.

• Amount of gas
• Outdoor unit air passage.
• Check the ball valve.

d

d77

(d7)

12-3. Troubleshooting check table

Room-A gas pipe temperature
thermistor abnormality

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

• Room A gas pipe temperature thermistor

characteristic.

• Contact of P.C. board connectors.

Room-B gas pipe temperature
thermistor abnormality

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

• Room B gas pipe temperature thermistor

characteristic.

• Contact of P.C. board connectors.

Room-C gas pipe temperature
thermistor abnormality

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

• Room C gas pipe temperature thermistor

characteristic.

• Contact of P.C. board connectors.

Room-D gas pipe temperature
thermistor abnormality

When a short or open circuit occurs in the Room-D gas pipe
temperature thermistor.

• Room D gas pipe temperature thermistor

characteristic.

• Contact of P.C. board connectors.

f

f55

(F5)

p

p9

9

(P9)

f

f77

(F7)

f

f6

6

(F6)

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