Learn about Growatt Error Code 404, its meaning, causes, and solutions for CPU communication faults.
Error Code 404 indicates a CPU communication fault, which can disrupt system performance. It often requires troubleshooting to restore normal operation.
To fix a CPU communication fault, check all connections and ensure the inverter is properly powered. If the issue persists, consult the user manual or contact support.
The Growatt inverter triggers error 404 when it detects a communication fault between the CPU and other internal components. This can occur due to several electrical logic failures, such as inadequate isolation resistance (RISO) measurements, which can indicate potential ground faults. If the inverter's CPU does not receive the necessary data packets from the monitoring system or string voltage readings from the array, it will enter a fault state to prevent further operational issues. The inverter relies on stable grid frequency limits and proper grounding to maintain effective communication; deviations can lead to communication breakdowns.
Homeowners may observe a red LED indicator on the inverter, signaling a fault. Additionally, monitoring applications may display an error 404 along with a significant drop in energy production. The inverter may also become unresponsive to commands from the monitoring system, indicating a communication failure.
Always consult a licensed electrician or certified solar installer when troubleshooting electrical systems. Working with inverters and high-voltage systems can pose serious safety risks.
To avoid encountering the 404 in the future, conduct regular maintenance checks on the inverter, including visual inspections of wiring and connections. Ensure the inverter is installed in a well-ventilated area to prevent overheating and keep firmware updated. Implement a routine testing schedule for insulation resistance and grounding integrity.