Samsung aircon E122 error code & blinking light
Use this Samsung E122 guide to decide when to stop resetting, what to capture, and what to check before parts are quoted. Match the model first; same-looking signals can point to different rows.
What does Samsung E122 mean?
Samsung E122 is listed as defective heat exchanger temperature sensor and indoor heat-exchanger temperature sensor error in All Residential Platforms rows such as Samsung common indoor-unit display / alarm rows. The loaded row is source-backed by official diagnostic material. Do not collapse this code across model families; use the model, series, or system type to choose the right row. Confirm the exact model, series, or signal row before accepting a parts quote.
Open, shorted, displaced, or out-of-range thermistor or pressure-sensor reading.
Loose sensor connector, damaged sensor harness, or water-affected wiring.
PCB input fault after the sensor and wiring readings are confirmed.
What to do now
Use these steps before another reset, sensor check, or PCB quote.
Treat it as a fault signal
If E122 returns or cooling is still abnormal, stop treating it as a simple reset issue.
Reset E122 once
Capture the E122 pattern first, then power-cycle once only and note whether the same fault returns.
Send these to us
E122 error code and blinking light, a clear display photo and blinking-light video if the unit shows one, Samsung model stickers, affected rooms, reset result, and when the fault appears
Source-specific guidance
These diagnostic-reference notes help match the code to the exact model. Electrical, refrigerant, wiring, resistance, and component checks are technician work, not DIY steps.
| Source detail | What it says |
|---|---|
| Source repair action | Contact a Samsung service center or qualified technician for diagnosis. |
| Source repair action | Arrange indoor coil sensor and connector checks if cooling or fan operation is abnormal. |
| Singapore / model note | Official Samsung common indoor-display row. Samsung notes that the display design and first letter can differ by model, so record the exact sequence shown before quoting repairs. |
What to check before repair
Use this split to separate safe evidence capture from the tests a technician should prove before quoting parts.
| You can check | Technician should confirm |
|---|---|
| Before resetting E122, take a clear display photo and blinking-light video if the unit shows one. | Confirm which sensor E122 maps to on the exact model table. |
| Capture the Samsung indoor and outdoor model stickers so the correct family row is used. | Measure the sensor value against the service-manual resistance or voltage range. |
| Note whether one room, several rooms, or the whole system is affected, plus whether it returns after one reset. | Check connector condition, harness continuity, and PCB input before replacing boards. |
What changes the next step
These clues decide whether the first check is room-side, shared outdoor-side, refrigerant-side, source-table, or model-family confirmation.
| What you see | What it points to |
|---|---|
| Only one indoor unit shows E122. | The affected room, indoor board path, wiring route, or local component should be checked first. |
| Several rooms or the outdoor unit show the same E122 fault. | The shared outdoor side, power path, communication trunk, or refrigerant circuit needs priority checking. |
| The fault appears immediately even before the unit cools properly. | Sensor value, connector, harness, and PCB input should be tested in that order. |
| The same code appears with different meanings in the source rows. | Model family, source table, and system type decide which meaning applies before parts are quoted. |
| The model belongs to All Residential Platforms rows such as Samsung common indoor-unit display / alarm rows. | The loaded row is source-backed by official diagnostic material. Use the matching source row before quoting parts. |
Sensor or PCB decision
Samsung E122 is usually repair-first if a sensor or harness reading is confirmed. Board replacement should wait until the sensor circuit is tested.
Sensor replacement is usually targeted when resistance or voltage readings are out of range.
Harness or connector damage can look like a sensor fault until continuity is checked.
PCB replacement is a later step if the sensor and wiring test correctly.
Samsung E122 questions
What does the Samsung E122 error mean?
Can I fix a Samsung E122 error myself?
Is it safe to keep running the aircon with a E122 error?
What causes a Samsung E122 error?
Will a Samsung E122 error need a repair or a full replacement?
What should I send a technician about a Samsung E122 error?
Confirm the fault
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Not the right code?
Browse the full Samsung list or check a few codes in the same fault category.
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Read next
Use these if the quote mentions the parts, checks, or repair path this code points to.