Alarm 331 (or 443, 126) Overheated inverter — Inverter reached max working temperature (low supply voltage)

What does Overheated inverter 331 mean?

This alarm indicates the inverter has reached its maximum working temperature due to poor cooling, occurring 3 times within 2 hours or continuously for 1 hour, potentially linked to low supply voltage.

• Low supply voltage.
• Poor cooling of the inverter.

Click steps to track your progress.

1. 1

   Check the indoor module/control module display for specific action instructions.

2. 2

   Ensure that the air flow to S2125 is not blocked by foreign objects, which can impede cooling.

3. 3

   Verify all supply cables to the Heat Pump are connected and secure.

4. 4

   If the alarm persists, contact a qualified electrician to check the supply voltage and a technician to inspect the inverter cooling.