InverterSN：9010KDTU175W1210
FaultCode：131072
Vac Failure
Error information
VAC Failure E15
Explanation
Inverter detects that AC voltage is beyond the normal range required by the safety country
Possible Reason
1. Safety country of Inverter is set wrong 2. Grid voltage is not stable 3. AC (to grid) cable too small or too long which makes resistance value is high 4. AC cables are not connected well, which cause a abnormal voltage on AC side
Solution
1. Check if safety country of the inverter is set right, if not, please change it to the right one 2. If safety country is right, then please check (use multimeter) on AC side if the voltage of each phase (Between L1&N, L2&N, L3&N) is within a normal range a. if voltage of any phase is too high, then please make sure AC cable is big enough (please refer to user manual of the inverter) and make sure AC cable length is not too long; b. if voltage of any phase is too low, then please check if this phase cable connection is right(make sure the rubber skin of AC cable is not conpressed into AC terminal) c. please also check the cable connection on AC breaker side 3. Make sure the grid voltage of your area is stable and within normal range.
Remark
If everything above is well, but failure still happen, then please collect the detailed information and contact GoodWe.
Note
1. Sometimes, the inverter was installed in a remote place like in a montain area or very far away from the grid control transformer, thus always cause failure;2. If the AC cable is aged, which will cause a higher resistance of the cable. This may also cause VAC failure. If So, please change new AC cable.3. If the failure happens only sometimes at early morning when inverter first try to start up, then please do not worry about this. This is because when first inverter try to start up and try to connect to grid, there might have an instantaneous high voltage. If it goes back to normal state, then means everything is OK.4. If VAC happens together with Utility Loss (E23) and FAC failure (E03), it means grid not connected well or grid power is off. Please take it as only Utility Loss case