EG4 mini split error code 73
Current input limitation. Also shown as 73.
- TypeProtection
- SystemPower supply
- Can I fix it?Usually a homeowner fix
What 73 means on a EG4
The unit is limiting its output because input current is at the limit. It keeps running at reduced capacity. Common on a hybrid unit when the solar input is weak and the AC circuit is shared.
On this platform, 73 is a protection: the system stopped or throttled itself to prevent damage; many clear on their own once conditions return to normal.
Common causes
- Weak solar input with the AC feed on a marginal circuit.
- A dirty outdoor coil raising current.
- Extreme outdoor temperatures.
How to fix it yourself
You can almost always clear this yourself with the steps below.
- Look at the outdoor unit: clear leaves, cottonwood fluff, snow or ice from the coil and make sure the fan can spin freely and nothing is stacked against the cabinet.
- On a hybrid unit, also check the DC input: undersized or shaded panels, a loose MC4 connector, or a DC voltage outside the 90 to 350 V window will show up as a power protection.
- If you own a multimeter and are comfortable using it, measure the supply voltage at the outdoor unit's L1 and L2 terminals with the unit running. A 230 V system should read roughly 208 to 253 VAC.
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
No technician unless it persists with a clean coil and healthy inputs.
Which EG4 units show 73
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 73 as "Current input limitation", 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 73:
Questions people ask
Can I reset a EG4 73 code myself?
Yes. Turn the system off at the breaker for five minutes, then restart it. If 73 comes back, the fault is real and needs the checks above.
Is it safe to keep running a EG4 showing 73?
Not repeatedly. A protection code means the unit stopped itself to prevent damage, and resetting it over and over can turn a cheap repair into a compressor failure. Reset once, check the basics, and stop if it returns.
Do I need a technician for EG4 73?
You can almost always clear this yourself with the steps below. No technician unless it persists with a clean coil and healthy inputs.
Sources
- EG4 12K Hybrid Solar Powered Mini-Split R32 User Manual (2025), section 14.3 Indoor Unit LED Error Codes
- EG4 12K / 24K Hybrid Mini-Split AC/DC R32 User Manual (10/2025)
Updated September 2026. Codes and definitions vary by model year. If your manual disagrees with this page, your manual wins. Send a correction.