Panasonic CS-E7NKEW Service Manual

Also see for CS-E12NKEW: Operating instructions Operating instructions

Contents

Panasonic CS-E7NKEW Service Manual Manual pdf 125 page image

12516.4.28 F99 (Output Over Current Detection)Malfunction Decision Conditions During operation of cooling and heating, when an output over-current (DC peak current value at IPM PreventionControl) is detected by checking the current that flows in the inverter DC peak sensing circuitry.Malfunction Caused Faulty outdoor unit PCB Faulty compressorTroubleshooting Checking the power transistor Never touch any live parts for at least 10 minutes after turning off the circuit breaker. If unavoidable necessary to touch a live part, make sure the power transistor’s supply voltage is below 50V usingthe tester. For the UVW, make measurement at the Faston terminal on the board of the relay connector.Tester’s negative terminal Power transistor (+) UVW Power transistor (-) UVWTester’s positive terminal UVW Power transistor (+) UVW Power transistor (-)Normal resistance Several kΩ to several MΩAbnormal resistance 0 or ∞