- Appliances
- Air purifiers
C138
Samsung C138 on an air purifier: gas sensor fault
Risk level
Low
Usually safe to check without specialist tools.
Urgency
Medium
Quick answer
On a Samsung air purifier, C138 means the gas sensor or the electronic panel it connects to is not working correctly. Unplug it for 30 seconds and plug it back in; if C138 returns, request service.
Safety first
Stop and check this first
- C138 does not mean there is dangerous gas in the home: it is a fault of the sensor or its panel. If you smell gas, act as for any leak, not according to the purifier display.
Safe checks you can perform
- Reset by unplugging for 30 seconds
- When the code appears
- Other purifier functions
Leave these tasks to a qualified professional
- Do not attempt this professional task: Test of the gas sensor and its connection
- Do not attempt this professional task: Final check without a code
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.
Test of the gas sensor and its connection
What they doThe technician tests the gas sensor, its connector and the signal reaching the electronic panel using Samsung's service procedure.
They must show youthe sensor and connector check and the result against Samsung's requirement.
In writingwhich part fails, its reference and why the other is ruled out.
Final check without a code
What they doAfter the repair, the technician leaves the purifier running and confirms C138 does not return.
They must show youthe purifier running without C138.
In writinghow long the test lasted and the result.
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.
Reset by unplugging for 30 seconds
- Who:
- you, no tools.
- How:
- switch the purifier off, unplug it, wait 30 seconds and plug it back in, as Samsung says. Do it with the room ventilated and no sprays used nearby just before.
- Result that matters:
- whether the code comes back after the reset.
- If the code does not return:
- it was a one-off; note the date in case it repeats.
- If the code returns:
- Samsung says to request service; do not open the unit.
- Evidence to keep:
- photo of the display with the code and the time of the reset.
Evidence: Samsung air purifier shows an error code
When the code appears
- Who:
- you.
- How:
- note whether C138 appears right at switch-on or after a while in use.
- Result that matters:
- a pattern that helps the technician separate sensor and panel.
- If it always appears at switch-on:
- tell the technician; it points to a fixed fault.
- If it appears now and then:
- note when; an intermittent fault needs a longer test.
- Evidence to keep:
- notes with date, time and operating mode.
Evidence: Samsung air purifier shows an error code
Other purifier functions
- Who:
- you.
- How:
- check whether the fan still moves air and the display responds to the buttons while C138 is shown.
- Result that matters:
- whether the fault is limited to the sensor or the unit stops responding.
- If everything else works:
- the fault is limited to gas sensing; request service if it persists.
- If nothing responds:
- tell the technician; the electronic panel may be involved.
- Evidence to keep:
- short video of the behaviour with the code on the display.
Evidence: Samsung air purifier shows an error code
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
- Appliances
- Brand
- Samsung
- Product type
- Air purifiers
Known code variants
- C 138
- purificador Samsung C138 sensor de gas
- Samsung air purifier C138
- Samsung purificador C138
- Samsung purifier C138 gas sensor error
What it means
Samsung defines C138 as a gas sensor error: the gas sensor or the internal electronic panel it is connected to is not operating correctly. This sensor measures gases in the room air; the code does not tell whether the sensor itself or the panel reading its signal has failed, so it does not prove the sensor needs replacing. Samsung's only step is to unplug for 30 seconds and plug back in; if the error returns, the unit needs service.
Warnings and stop conditions
- Loweditorial warning
C138 does not mean there is dangerous gas in the home: it is a fault of the sensor or its panel. If you smell gas, act as for any leak, not according to the purifier display.
Evidence: Samsung air purifier shows an error code
Symptoms and causes
Probable causes · in order
- One-off abnormal readingPossible
If C138 does not return after the 30 second reset, the control had a momentary abnormal reading and no fault is confirmed.
Evidence: Samsung air purifier shows an error code
- Gas sensorPossible
If the error persists, one possibility is the gas sensor itself; the technician should test it before replacing it.
Evidence: Samsung air purifier shows an error code
- Electronic panel reading the sensorPossible
Samsung also names the internal panel the sensor connects to; if the sensor tests fine, the fault may be in that panel or its connection.
Evidence: Samsung air purifier shows an error code
Virtual technician
Does C138 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 air purifier shows an error code
Samsung · official_doc
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