Carrier 50UA-UH 135 - Troubleshooting Guide; Troubleshooting Chart

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A list of possible faults, as well as the probable cause and suggested solutions is shown in the table below. In the event of
a unit malfunction it is recommended to disconnect the power supply and ascertain the cause.
ÑÅÈÌÇÅË ¹Í˽ ½Å½¼Ñ
ÆÁÌ¼Ç½ËÆÇÌË̹ÊÌ No power supply
Main switch open
Low line voltage
A protection has tripped
Contactor stuck open
Compressor failure
Connect power supply
Close main unit disconnect switch
À½»ÃÎÇÄ̹¿½¹Æ¼ʽŽ¼ÑÌÀ½¼½Ų»Á½Æ»Ñ
Reset
Check and if necessary replace contactor
Check and if necessary replace compressor
ÆÁÌË̹ÊÌË¹Æ¼ËÌÇÈË¾Ê½ÉͽÆÌÄÑ Defective compressor contactor
Defective compressor
Refrigerant losses
Check and if necessary replace contactor
Check and if necessary replace compressor
Check and add the necessary quantity
ÆÁÌ»ÇÆÌÁÆÍÇÍËÄÑ»ÍÌËÇÍÌ¹ÌÄÇÏ˹ÌÍʹ̽¼
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ÇÇÄÁÆ¿ÍÆÁÌƯÀ½¹ÌÈÍÅÈ
Defective low pressure transducer
Refrigerant losses
Indoor/outdoor fan does not operate
Check and if necessary replace low pressure transducer
Check and add the necessary quantity
Check fan motor
ÆÁÌ»ÇÆÌÁÆÍÇÍËÄÑ»ÍÌËÇÍÌ¹Ì˹ÌÍʹ̽¼¼ÁË»À¹Ê¿½
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ÇÇÄÁÆ¿ÍÆÁÌƯÀ½¹ÌÈÍÅÈ
Defective high pressure transducer
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Indoor/outdoor fan does not operate
Check and if necessary replace pressure transducer
À½»Ã¹Æ¼Á¾ƽ»½Ë˹ÊÑʽÈĹ»½ŲÄ̽Ê
Check fan motor
ºÆÇÊŹÄËÑË̽ÅÆÇÁ˽ Noisy compressor
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Check and change if necessary
Install correctly
ÇÅÈʽËËÇÊÄÇ˽ËÇÁÄ Leak in system Repair leak
¹Ì½ÊÄÇËË Defective drainage connections Check and tighten if necessary
)-0/24!.4&OLLOWINGANYOPERATIONONTHEAPPLIANCE
which has necessitated removal and replacement of any
parts, the appliance shall be recommissioned in accordance
with the Commissioning section of these instructions.
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