Daikin LX10F11B Service Manual page 71

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106 E52C
Alarm Inverter board temperature is over-heated (≧90℃ with 260 sec elapse or ≧99℃ with 5 sec
Logic
elapse)
Possible ①Ambient temperature is high （>50℃）
Causes
②Inverter board failure （fin temperature detection part）
③Inverter box is heat up due to less air circulation.
Trouble ①External operating temperature of the unit is up to 50 ℃
Shooting
Check cooling air for condenser coil is short circuit or condenser air restriction.
③ Clean the radiator fin installed on back side of inverter box and bottom of inverter box in order
to remove air restriction.
In case of the alarm is repeated after remove external factor ① and ③, replace inverter board.
E52C Restart after 3 minutes
107 E531
Alarm Unbalanced power phase is supplied
Logic
Possible
Abnormal power supply
Causes
Trouble Regardless alarm is generated, restart after 3 minutes standby.
Shooting
Operation continues if the external factor is improved.
E531 Restart after 3 minutes
108 E532
Alarm Voltage in inverter becomes ≧DC790V or ≦DC320V due to power supply voltage≧AC530V or
Logic
≦AC300V.
Possible ①Power supply voltage is at high voltage (≧AC535V), or low voltage (≦AC300V).
Causes
②Inverter board failure (Voltage detection part)
Trouble ①Check if the actual power voltage is within range (300V〜535V）.
Shooting
＊ Provide the power supply within range if it is out of range.
Restart after 3 minutes standby.
Operation continues if the power supply condition is improved.
② If the power voltage is within range, it seems to be inverter board failure. Replace inverter
board.
Controller
E532 Restart after 3 minutes
Action
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