Trouble shooting 4 INDOOR UNIT Error Method:
Room temp. sensor error
Indicate or Display:
Refer to error code table.
Detective Actuators:
Indoor unit Controller PCB Room temperature thermistor
Detective details:
When Room temperature thermistor open or
Forecast of Cause :
1. Connector connection failure 2.Thermistor failure 3. Controller PCB failure
Check Point 1 : Check connection of Connector
Check if connector is removed.
Check erroneous connection.
Check if thermistor cable is open.
>>Upon correcting the removed connector or
OK |
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Check Point 2 : Remove connector and check Thermistor resistance value |
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Thermistor Characteristics (Approx. value) |
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Temperature |
| 0°C | 5°C | 10°C | 15°C | 20°C | 25°C | ||
| (14°F) | (23°F) | (32°F) | (41°F) | (50°F) | (59°F) | (68°F) | (77°F) | |
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Resistance Value (k | ) | 55.46 | 42.36 | 32.67 | 25.39 | 19.91 | 15.71 | 12.5 | 10.0 |
Temperature |
| 30°C | 35°C | 40°C | 45°C |
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| (86°F) | (95°F) | (104°F) | (113°F) |
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Resistance Value (k | ) | 8.051 | 6.52 | 5.316 | 4.354 |
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If Thermistor is either open or shorted, replace it and reset the power. |
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OK |
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Check Point 3 : Check voltage of Controller PCB (DC5.0V)
Make sure circuit diagram of indoor unit and check terminal voltage at Thermistor (DC5.0V)
THERMISTOR |
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(PIPE) |
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BLACK | 1 | 1 |
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BLACK | 2 | 2 | CN4 |
BLACK | 3 | 3 |
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BLACK | 4 | 4 |
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THERMISTOR |
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(ROOM TEMP.) |
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If the voltage does not appear, replace Controller PCB.
