EG4 mini split error code 04

Common causes

• The front panel pressing on the manual button.
• A stuck or failed button.

How to fix it yourself

You can almost always clear this yourself with the steps below.

1. Open the front panel and check nothing is pressing the small button under it.
2. Reset the system: switch the breaker (or the outdoor disconnect) off, wait a full five minutes so the boards fully discharge, then switch it back on and restart from the remote.

Switch off power at the breaker before opening either unit. Capacitors in the outdoor unit hold a charge for several minutes after power is cut.

When to call a technician

Display board replacement if a button has failed.

Which EG4 units show 04

This page applies to EG4 12K hybrid solar mini split (AC/DC, R32) and 12K / 24K hybrid mini split AC/DC R32 (DWA4 / DWB3 / DGA) units. EG4's own documentation lists 04 as "Indoor unit buttons stuck", the same definition used across the EG4 hybrid solar mini split it is built on. If your unit shows a code with a different shape (for example a four-character code, or a plain number), it is from a different table; use the lookup with your exact code.

Where EG4 shows this code

The indoor unit's LED display shows a two-digit number in place of the temperature. EG4 units also run on DC from solar panels, so several codes concern the DC input and the power stage rather than the refrigerant side. 01 to 06 are indoor and communication faults, 31 to 37 are temperature sensors, 51 to 58 are motors, 72 to 79 are voltage and current protections, and 81 to 96 are inverter and compressor drive faults.

Other EG4 codes

Same part of the system as 04:

All EG4 error codes