Mitsubishi Electric PURY-80TMU Service Handbook page 91

City multi

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Checking code

Meaning, detecting method

1500

Overcharged

1. When discharge superheart

refrigerant

10 (18) deg is keeping for 10

abnormality

minutes or discharge superheat

outdoor unit stops once, and af-

ter 3 minutes, the unit restarts.

For 60 minutes after unit stopped

is intermittent fault check period.

2. When discharge superheart

(18) deg is keeping for 10 min-

utes or discharge superheat

(36) deg for 15 minutes again

(second time), the unit stops and

error code 1500 is displayed.

3. In case of SW2-6 ON, the de-

tection for the second time is fol-

lowed by the first time.

1501

Lacked

1. When the unit condition is as

refrigerant

follows, the compressor is

abnormal-

stopped (1st detection) and af-

ity

ter 3 minutes, the compressor

is restarted automatically.

1 F<60Hz and TH10>85°C

2 F<60Hz and TH10>95°C

3 F

4 F

2. If the temperature rises again as

above within 2 hours after the out-

door unit is stopped (2nd detection),

an error stop is performed, and the

check code 1501 is displayed.

3. If the temperature rises again as

above within 2 hours after the out-

door unit is stopped, it becomes the

first detection again, and operation

is the same as in 1 above.

4. The 2 hour period after the outdoor

unit stops is the abnormal delay pe-

riod, and LED display is carried out

during the abnormal stop delay.

Note : °C Scale (°F Scale)

1) Excessive refrigerant charge.

2) Thermistor trouble (TH1).

20 (36) deg for 15 minutes,

3) Pressure sensor trouble (63HS).

4) Control circuit board trouble.

10

20

1) Gas leakage, insufficient gas.

2) Overload operation.

(185˚F) continuously for 60

3) Indoor unit LEV operation is faulty.

minutes.

4) Outdoor unit LEV1 operation is

(203˚F) continuously for 15

5) Outdoor unit SLEV operation is

minutes.

60Hz and TH10>100°C

(212˚F) continuously for 60

minutes.

60Hz and TH10>110°C

(230˚F) continuously for 15

minutes.

6) Ball valve operation is faulty.

7) The thermistor is faulty.

8) The control board's thermistor in-

Cause

faulty.

faulty.

put circuit is faulty.

–90–

Checking method

Check refrigerant amount.

Check resistance of thermistor.

See trouble shooting of pressure sensor.

Check temperature and pressure sen-

sor with LED monitor.

Refer to the item on judging the refrig-

erant volume.

Check the indoor and outdoor unit op-

erating conditions.

Actually run the equipment in cooling

or heating mode and check the operat-

ing condition.

Cooling :

Indoor unit LEV

SLEV

Heating :

Indoor unit LEV

SLEV

Refer to the item concerning judging

LEV failure.

Check with the ball valve fully open.

Check the thermistor's resistance.

Check the sensor's temperature read-

ing by the LED monitor.

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