The short answer
Samsung mini splits show a three digit code, with an E in front on some models and a C on others. The number is what matters: 101 and 102 mean the indoor and outdoor units aren’t talking, 554 and 574 point to refrigerant, 154 is the indoor fan, and 440 or 441 means it’s too hot or too cold outside for the mode you picked. dF on the display is defrost, and that’s normal. Here’s what each one means and what you can try before calling anyone in Northern Virginia.
E or C, same number
Depending on the model year, the same fault shows as E101 on one Samsung and C101 on another. Look it up by the number. If your remote or display shows something else, grab the model number off the label on the side of the head before you call.
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Indoor unit codes
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| Code | What it means | What to do |
|---|---|---|
| 101, 102 | The indoor and outdoor units aren’t talking | One breaker reset. If it returns, the wiring between units or a board |
| 121 | The room temperature sensor | A sensor repair |
| 122, 123 | A coil temperature sensor in the head | A sensor repair |
| 154 | The indoor fan | Off for a few seconds, then on. If it comes right back, call |
| 665 | The drain pump | Turn it off before the pan spills. More in mini split condensate pump |
Outdoor unit codes
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| Code | What it means | What to do |
|---|---|---|
| 416 | The compressor discharge is running too hot | Call. Often low refrigerant or a blocked coil |
| 440, 441 | It’s outside the outdoor temperature range for the mode you picked | Usually clears on its own when the weather changes. If it shows up in normal weather, call |
| 458 | The outdoor fan | Clear snow, ice and leaves from the fan. If it returns, call |
| 461 | The compressor didn’t start | Turn it off and call |
| 464 | Over current in the power module that drives the compressor | Turn it off and call |
| 554 | The system detected a refrigerant leak | Turn it off and call |
| 574 | Not enough refrigerant | Call. Low means a leak |
Samsung’s own advice for a fan code like 154 is simple: turn the unit off for a few seconds and back on. If the code comes back within about 10 seconds, it’s a service call. That’s a good rule for most of these.
Displays that aren’t faults
dF means defrost. The outdoor unit is melting frost off its coil, the warm air stops for a few minutes, and you may see steam outside. Heat pump covered in ice shows what normal frost looks like. 440 and 441 are protections more than faults: the unit won’t run a mode in weather it isn’t built for, and it waits until the temperature comes back into range.
Refrigerant codes: 554 and 574
These two mean refrigerant is missing. It doesn’t get used up, so it leaked out somewhere: a flare joint, a coil or a fitting. A tech licensed to handle refrigerant has to find the leak, fix it, pull a vacuum and recharge it. Adding refrigerant without fixing the leak only buys time. Newer systems use R-454B, covered in the R-454B change.
Symptoms, causes and fixes
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| What you see | Usually why | What to do |
|---|---|---|
| Blows cool in heat mode with dF on the screen | Defrost | Wait. It clears in a few minutes |
| Blows cool in heat mode with no code | The wrong mode, dirty filters, or low refrigerant | Check the mode and the filters. More in mini split not heating |
| Water dripping from the head | A clogged drain, or a drain pump code | Mini split leaking water |
| Grinding or rattling outside | Ice or debris in the outdoor fan | Mini split making noise |
One reset, not ten. Turn the head off with the remote, switch the breaker off for about 5 minutes, then turn it back on. If the same code comes back, write it down with the model number from the label and call. Resetting a fault over and over can hide what it was protecting.
Brand by brand: Mitsubishi, Carrier, Daikin, Fujitsu, LG and MrCool, Pioneer, Gree and Senville. Every code family we’ve written up is on our error codes and warning lights page.
Book it
A mini split visit starts with our $99 diagnostic, and you get the repair price in writing before anything is opened. Call (703) 997-9757 or book a visit online and tell us the brand and the code or what you’re seeing. Rated 5.0 stars across 1,138 reviews on Google, Angi, Yelp, the BBB and Facebook, Virginia Class A license 2705192276.
Mitsubishi Electric, Carrier, Daikin, Fujitsu, LG, Samsung, MrCool, Pioneer, Gree and Senville are trademarks of their owners.
Questions people ask
What does E101 or C101 mean on a Samsung mini split?
The indoor and outdoor units aren’t communicating. One breaker reset can clear it. If it returns, the wiring between units or a board needs testing.
What does 554 mean on a Samsung mini split?
The system detected a refrigerant leak. Turn it off and call. The leak has to be found and fixed before the system is recharged.
What does dF mean on a Samsung mini split?
Defrost. The outdoor unit is melting frost off its coil. The warm air stops for a few minutes, and that’s normal.
How do I clear a Samsung mini split error code?
Turn the unit off for a few seconds and back on. If the code comes right back, it’s a service call, not a reset.
Why does my Samsung show an E code on one unit and a C code on another?
Samsung changed the prefix between model years. The number means the same thing, so look it up by the number.
