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2WAY VRF SYSTEM
Trouble Diagnosis
3. 2WAY Alarm Codes
H05, H15 Alarm
Alarm code
H05, H15
Alarm meaning
H05 : DISCH1 thermistor at the discharge of 1st compressor is disconnected, shorted or misplaced.
(DISCH1)
H15 : DISCH2 thermistor at the discharge of 2nd compressor is disconnected, shorted or misplaced.
(DISCH2)
Alarm conditions
•
This alarm occurs when the discharge sensor temperature detector is not inserted into the tube’s
sensor holder, or when the sensor itself has suffered some kind of malfunction other than a cut wire.
•
When outdoor air temperature is 14°F (-10°C) or higher:
Alarm occurs if the temperature detected by the discharge sensor has changed by less than
3.6°F (2°C) when the compressor has operated for 10 minutes immediately after start.
•
When outdoor air temperature is below 14°F (-10°C):
Alarm occurs if the temperature detected by the discharge sensor has changed by less than
3.6°F (2°C) when the compressor has operated for 30 minutes immediately after start.
Probable cause
(1) Discharge sensor temperature detector is not inserted into the tube’s sensor holder.
(2) Discharge sensor itself has suffered some kind of malfunction other than a cut wire.
Check
(1) Check that the discharge temperature sensor is inserted into the sensor holder.
(2) Check that sufficient heat-conducting putty is applied.
(3) Remove the discharge sensor from the sensor holder and expose the sensor to the outside
air for approximately 5 minutes. Check that the temperature detected by the sensor changes
to match the outside air temperature. (However the sensor cannot detect temperatures at or
below 32°F (0 °C).)
Correction
(1) Install the sensor into the holder, and apply sufficient heat-conducting putty.
(2) If the sensor is malfunctioning, replace it.
Example
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SM830237-07_北米向け2WAY_VRF.indb 17
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