Mitsubishi Electric PURY-80TMU Service Handbook page 97

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Checking code

Meaning, detecting method

4260

Cooling fan

If the heat sink temperature (THHS)

abnormality

100°C (212°F) for 20 minutes or longer

just before the inverter starts.

5101

Discharge

1 A short in the thermistor or an

(TH1)

open circuit was sensed. The

outdoor unit switches to the

temporary stop mode with re-

starting after 3 minutes, then if

5105

Heat

the temperature detected by the

exchanger

thermistor just before restarting

inlet pipe

is in the normal range, restart-

(TH5)

ing takes place.

2 If a short or open circuit in the

thermistor is detected just be-

5106

Ambient

fore restarting, error code

tempera-

"5101", "5105", "5106", "5107"

ture (TH6)

is displayed.

3 In the 3 minute restart mode,

the abnormal stop delay LED is

displayed.

4 The above short or open circuit

5107

Heat

exchanger

is not detected for 10 minutes

inlet pipe

after the compressor starts, or

(TH7)

for 3 minutes during defrosting

or after recovery following de-

frosting.

5110

Radiator

panel

If a heat sink (THHS) temperature

(TH HS)

-40°C (-40˚F) is detected just

after the inverter starts or during in-

verter operation.

5111

Liquid inlet

1. When short (high temp. inlet) or

(TH11)

open (low temperature inlet) of

thermistor is detected during

operation, error stop will be

commenced displaying "5111"

or "5112", or "5115" or "5116.

Bypass

2. The above detectection is not

outlet

made during defrostig and 3-

(TH12)

minute after changing operation

mode.

Bypass

inlet

(TH15)

Intermedi-

ate section

(TH16)

Cause

1) Same as "4230."

1) Thermistor

2) Lead wires are being pinched.

3) Insulation is torn.

4) A connector pin is missing, or there

is faulty contact.

5) A wire is disconnected.

6) The thermistor input circuit on the

MAIN circuit board is faulty.

(In the case of the THHS, replace

the INV board.)

Short Circuit Detection

TH1

240°C (464˚F) or higher (0.57 kΩ)

TH5

110°C (230˚F) or higher (0.4 kΩ)

TH6

110°C (230˚F) or higher (0.4 kΩ)

TH7

110°C (230˚F) or higher (1.14 kΩ)

THHS

–

1) Thermistor trouble.

2) Biting of lead wire.

3) Broken cover.

4) Coming off of pin at connector por-

tion, poor contact.

5) Broken wire.

6) Faulty thermistor input circuit of

control board.

Short Detected

TH11 110°C (230˚F) or more (0.4 kΩ)

TH12 110°C (230˚F) or more (0.4 kΩ)

TH15 70°C (158˚F) or more (1.14 kΩ)

TH16 70°C (158˚F) or more (0.4 kΩ)

–96–

Checking method & Countermeasure

Same as "4230."

Check the thermistor's resistance.

Check if the lead wires are pinched.

Check for tearing of the insulation.

Check if a pin is missing on the con-

nector.

Check if a wire is disconnected.

Check the temperature picked up by

the sensor using the LED monitor.

If the deviation from the actual tem-

perature is great, replace the MAIN cir-

cuit board.

(In the case of the THHS, replace the

INV board.)

Open Circuit Detection

15°C (59˚F) or lower (321 kΩ)

-40°C (-40˚F) or lower (130 kΩ)

-40°C (-40˚F) or lower (2.5 MΩ)

Check thermistor resistance.

Check lead wire biting.

Check broken cover.

Check coming off of pin at connector.

Check broken wire.

Check sensor sensing temperature. If

it deviates from the actual temerature

seriously, replace control panel.

Open Detected

-40°C (-40˚F) or less (130 kΩ)

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