Samsung E122 Error Code

The Meaning

Why Does a Samsung Show E122?

Inside the indoor unit, refrigerant flows through copper pipes woven through thin aluminium fins. In cooling mode, that coil gets very cold. In heating mode, it gets hot. A small thermistor clipped to the pipework keeps watch on that temperature.

The control board reads the thermistor as a resistance value. When the value suddenly reads as open, with no current flowing, or as shorted, stuck at one extreme, the board decides the information is unreliable. It then stops the system and displays E122. Technical lists describe this as an open or short fault on the indoor evaporator inlet sensor, while Samsung’s own support pages call it a defective heat exchanger temperature sensor.

Both descriptions point at the same part. What changes between models is mainly the name, not the fault.

Reading the Display

How Does E122 Appear on Different Samsung Units?

The way the code looks depends on your display. On a wall split with a two character readout, the board splits the code. You will see E1, a short pause, then 22, repeated. Read together, it is E122.

Some model years swap the leading letter for C. Samsung’s support material lists the coil sensor fault as C1 or 22 on a loop. Therefore, C122 and E122 describe the same problem. Wired wall controllers on ducted and cassette systems typically show E122 as one string, and multi unit systems may add the indoor unit number.

Is there a way to tell an E122 apart from a normal defrost pause? Yes. During defrost, a Samsung usually shows dF or simply stops blowing warm air for a few minutes before resuming on its own. A fault code, by contrast, stays on the display and the unit does not restart by itself. If you are unsure, wait ten minutes. Defrost finishes and heating resumes, while E122 remains.

Similarly, a brief pause at the start of heating is normal. The indoor fan holds off until the coil is warm, which prevents a cold draught. That delay is the coil sensor doing its job, not a sign of a fault.

Because displays vary, photographing the screen is the easiest way to capture the code accurately. Include the model sticker on the side of the indoor unit in a second photo.

Homeowner Checks

What Can You Do Safely Before Booking?

These checks stay on the outside of the unit. They are designed to rule out a passing glitch and to gather useful information. Please do not remove covers or reach toward the coil, which has sharp fins and sits near live parts.

• Note the code exactly as displayed and the mode the unit was in at the time.
• Look for ice on the visible edges of the indoor coil through the grille. If you see ice, switch to fan only to let it melt.
• Check that the filters are clean. Heavily clogged filters make the coil run much colder in cooling.
• Look under the indoor unit for water drips, which may suggest a drain problem affecting the sensor area.
• Do a single power cycle at the breaker, waiting several minutes before turning it back on.
• If the code returns, leave the unit off and arrange a visit.

Clean filters are especially relevant here. A clogged filter starves the coil of warm air in cooling mode. That drives the coil temperature down, encourages icing, and puts the sensor through harsh freeze and thaw cycles that shorten its life.

Telling Faults Apart

Is It Really the Sensor or Something Else?

A coil sensor code can sometimes be the messenger for a wider problem. That is why a good technician does not stop at swapping the sensor. They also ask why it failed, especially if the old sensor shows signs of repeated icing or water damage.

Finding the root cause protects the new part. Otherwise, a fresh sensor could fail again within a season for the same reason. Ask the technician what they think caused the failure, and whether any follow up work is recommended.

In some cases, the answer is simply age. Sensors in units that have run hard for many summers do eventually wear out. If that is the conclusion, a replacement is usually all that is needed, together with a general service while the unit is open.

Australian Climate

How Can Local Weather Contribute to E122?

The coil sensor lives in a wet place, so humidity plays a part. During steamy weather in Brisbane or a humid Sydney summer, the indoor coil pulls a lot of moisture from the air. Water constantly runs over the pipework and the sensor clip. Over years, that can work its way into a weak seal or a plug.

Cold snaps are relevant too. On frosty winter mornings in Melbourne, Adelaide or the Perth hills, a reverse cycle unit heats hard and defrosts more often. The sensor swings between temperatures more frequently, which adds stress to the sensor and its clip.

Additionally, dusty conditions clog filters faster, which in turn makes coils run colder in summer. Homes near busy roads or building sites often need more frequent filter cleaning for exactly this reason.

Across Australia

Where Can You Get a Technician for E122?

We book licensed technicians in each of the five major capitals. To arrange a visit, go to Sydney air conditioner repairs, Melbourne air conditioner repairs, Brisbane, Perth or Adelaide. For Samsung specific details, see our national Samsung air conditioning page, or the city pages for Samsung in Brisbane and Samsung in Sydney.

When you call, let us know whether you saw ice on the coil and whether the filters were dirty. Those observations help the technician decide whether the sensor failed by itself or whether something else was pushing it hard. Rapid Air Cooling is a booking service. We are not Samsung, so if your unit is under warranty, read your warranty terms first.

Questions

Frequently Asked Questions