- HVAC
- Air conditioner
E122
Samsung E122 on an air conditioner: heat exchanger sensor
Risk level
Medium
Proceed carefully and stop if the check is unclear.
Urgency
Medium
Quick answer
On Samsung air conditioners, E122 (shown as E1 then 22, or C1 and 22 on a loop) means a problem with the heat exchanger temperature sensor. Write down the code and model and contact Samsung's authorised service centre.
Safety first
Stop and check this first
- Samsung refers E122 to its authorised service centre. The sensor is inside the indoor unit, on the heat exchanger: do not open the casing or touch the board; with the power on there is mains voltage.
Safe checks you can perform
- Reading the two-part code
- Details for the service centre
- Measuring the heat exchanger sensor
Leave these tasks to a qualified professional
- Do not attempt this professional task: Measure the sensor before replacing it
- Do not attempt this professional task: Test with no code after the repair
What a technician must be able to justify
Technician visit
These are the steps they must carry out and show you. Tick them as they work: if steps are skipped, do not accept a part swap.
These are not instructions for opening or handling the equipment yourself. They are the checks that should support a technical conclusion.
Measure the sensor before replacing it
What they doThe technician measures the heat exchanger sensor and checks its connection before replacing parts.
They must show youthe measured value against Samsung's specification.
In writingwhich part was replaced, its reference and why.
Test with no code after the repair
What they doAfter the work the technician runs the unit and checks the display does not show E1 and 22 again.
They must show youthe display with no code while the unit runs.
In writingdate and result of the test.
Before accepting a part or repair
Nothing has been shown yet. Do not accept a part swap based on the code alone.
Follow these steps
Note: Follow the documented order. An error code identifies the affected system, but it does not prove by itself which part has failed.
Reading the two-part code
- Who:
- you.
- How:
- watch the indoor unit display for a few seconds: Samsung shows E1 then 22, or C1 and 22 on a loop, depending on the model.
- Result that matters:
- that the sequence is 22 and not 21 or 54.
- If it is E1 and 22:
- it is the heat exchanger sensor; carry on with this page.
- If it is E1 and 21:
- it is the room temperature sensor (E121); look up that page.
- Evidence to keep:
- a short video or photos of the display showing both parts.
Evidence: Samsung: Error codes frequently displayed on the indoor unit air conditioner · Samsung: Error codes on your Samsung indoor air conditioner · Samsung: How to fix E1, 22 error display on Air Conditioner
Details for the service centre
- Who:
- you.
- How:
- write down the code, as Samsung recommends, and the unit model before calling the authorised service centre.
- Result that matters:
- that the technician arrives knowing the exact code and model.
- If the indicator keeps blinking:
- write down the full code and call, as Samsung says.
- If the code clears:
- keep the photo anyway: it helps if it returns.
- Evidence to keep:
- a photo of the model label and the code.
Evidence: Samsung: Error codes frequently displayed on the indoor unit air conditioner
Measuring the heat exchanger sensor
- Who:
- an authorised service technician.
- How:
- with the power isolated, finds the indoor heat exchanger sensor, checks its connection and measures it against the manufacturer's specification.
- Result that matters:
- whether the sensor measures out of specification or the reading fails for another reason.
- If the sensor is out of specification:
- the sensor is confirmed as the cause.
- If it measures correctly:
- the cause is in the connection or the control; the sensor is not replaced.
- Evidence to keep:
- a job sheet with the measured value against the specification.
Requires opening the indoor unit with the power isolated: technician only.
Evidence: Samsung: How to fix E1, 22 error display on Air Conditioner
Still not solved
If the error persists, stop here. See what the technician must do and show you.
Where this code applies
A code is meaningful only inside the right product and version context.
Primary scope
- System
- HVAC
- Brand
- Samsung
- Product type
- Air conditioner
Known code variants
- C1 22
- C122
- E1 22
- Samsung E122
What it means
Samsung links E122 to the heat exchanger temperature sensor of the indoor unit and describes it as a defective sensor. The display shows it in two parts, E1 then 22, or as C1 and 22 alternating, depending on the model. Samsung gives no user steps beyond contacting its service. Even though the page says defective sensor, the code only says the reading is not valid: the technician should measure the sensor before replacing it.
Warnings and stop conditions
- Mediumeditorial warning
Samsung refers E122 to its authorised service centre. The sensor is inside the indoor unit, on the heat exchanger: do not open the casing or touch the board; with the power on there is mains voltage.
Evidence: Samsung: Error codes frequently displayed on the indoor unit air conditioner · Samsung: How to fix E1, 22 error display on Air Conditioner
Symptoms and causes
Probable causes · in order
- Heat exchanger temperature sensorCommon
The only cause Samsung gives for E122. It is confirmed by measuring the sensor; it differs from E121, which Samsung assigns to the room temperature sensor.
Evidence: Samsung: Error codes frequently displayed on the indoor unit air conditioner · Samsung: Error codes on your Samsung indoor air conditioner · Samsung: How to fix E1, 22 error display on Air Conditioner
Virtual technician
Does E122 still appear after these checks?
Answer a few questions to narrow down the likely cause and the safest next action. Guidance only - it never replaces a professional.
Sources and technical references
- 1
Samsung: Error codes frequently displayed on the indoor unit air conditioner
Samsung Electronics · 2022 · official_doc
- 2
Samsung: Error codes on your Samsung indoor air conditioner
Samsung Electronics · 2025 · official_doc
- 3
Samsung: How to fix E1, 22 error display on Air Conditioner
Samsung Electronics · 2025 · official_doc
Was this entry useful?