Error, fault and alarm codes of products - what each code means, its causes and what to do - read from the manufacturers’ manuals, with the manual page each answer comes from.
52C abnormal because 52C turns off unexpectedly during inverter load. The manual's first action is: “CALL SERVICE ENGINEER”
Power unit error detected during load on bypass due to IGBT unit failure. The manual's first action is: “CALL SERVICE ENGINEER”
Inv. Volt. (DC) abn. occurs when output voltage contains unwanted DC components. The manual's first action is: “CALL SERVICE ENGINEER”
52C abnormal because 52C fails to turn on properly. The manual's first action is: “CALL SERVICE ENGINEER”
Output undervoltage happens when output voltage drops below acceptable levels under load. The manual's first action is: “CALL SERVICE ENGINEER”
Output overvoltage occurs during load on the inverter, exceeding safe output levels. The manual's first action is: “CALL SERVICE ENGINEER”
DC unbalanced due to voltage imbalance across DC capacitors. The manual's first action is: “CALL SERVICE ENGINEER”
DC voltage abnormal when DC overvoltage or reversal voltage is detected. The manual's first action is: “CALL SERVICE ENGINEER”
Battery abnormal as self-test detects a fault in the battery unit. The manual's first action is: “CALL SERVICE ENGINEER”
Batt. overtemperature indicates battery temperature has become abnormally high. The manual's first action is: “CHECK BATTERY”
CB2 abnormal because the CB2 status signal is erroneous. The manual's first action is: “CALL SERVICE ENGINEER”
DC voltage abnormal due to irregular DC voltage readings. The manual's first action is: “CALL SERVICE ENGINEER”
DC undervoltage occurs when the DC voltage falls below acceptable thresholds. The manual's first action is: “CALL SERVICE ENGINEER”
DC overvoltage detected as the DC voltage exceeds safe levels. The manual's first action is: “CALL SERVICE ENGINEER”
I/P circuit abnormal from converter current control error. The manual's first action is: “CALL SERVICE ENGINEER”