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GoodWe DSP Comm Fault

Updated June 2026 · Reviewed for technical accuracy · ~2 min read

DSP Comm Fault means the two processors inside your GoodWe lost communication with each other. The DSP runs the power stage that converts DC to AC, and the ARM chip handles control, display and monitoring. When they stop talking, the inverter stops to be safe. A full restart usually re-establishes the link.

What usually causes it

  • A transient glitch between the two chips, the most common cause.
  • A firmware mismatch or bug, which a GoodWe update resolves.
  • An internal connection or board fault, if it keeps returning after a clean restart.

How to handle it safely

  1. Do a full power cycle. Switch off the AC, then the DC isolator, wait 5 minutes, then restart so the two processors re-sync on boot.
  2. See if it clears. A one-off that does not return needs nothing more.
  3. If it persists, have your installer or GoodWe check for a firmware update, then service the board if the update does not fix it.
Owner-level action is one restart The DSP-to-ARM link is internal, so there is nothing to adjust from outside. If a clean power cycle does not hold, it is a service job.

Related GoodWe codes

SPI Failure, Comms EEPROM Failure No Display

FAQ

What is the DSP in my inverter?

The DSP is the digital signal processor that runs the power stage, the part that actually converts DC to AC. A second chip, the ARM, handles control, display and communications. DSP Comm Fault means those two stopped talking to each other.

A restart did not fix the DSP Comm Fault.

If a full power cycle does not clear it, the cause is more than a transient. Ask your installer or GoodWe to check for a firmware update first, and if that does not resolve it the control board needs service. Do not keep resetting it.

Helpful guides

Error codes explained How to safely restart your inverter Inverter not turning on

Sources

  • GoodWe inverter user manual and error-message list (DSP communication fault = loss of internal ARM-to-DSP communication; restart, update firmware, service if persistent).
  • GoodWe installer documentation.
⚠️ Safety disclaimer. Solar inverters carry lethal DC and AC voltage even when "off". This guide covers a safe power cycle only. Firmware updates and board service must be done by a licensed installer or GoodWe support.