- HVAC
- Air conditioner
101
Samsung 101 on an air conditioner: communication problem between units
Risk level
Medium
Proceed carefully and stop if the check is unclear.
Urgency
Medium
Quick answer
On Samsung air conditioners, codes 101 and 102 mean a communication problem between the units. Cut power at the switch, wait a few minutes and restore it; if it stays, contact Samsung support.
Safety first
Stop and check this first
- Samsung refers this code to an authorized service center. Do not open the unit: it carries mains voltage and, outdoors, the refrigerant circuit, which only an F-gas certified technician may work on.
Safe checks you can perform
- Power cut at the switch
- Power to both units
- Cable between units
Leave these tasks to a qualified professional
- Do not attempt this professional task: Check cable and supply before replacing boards
- Do not attempt this professional task: Operating test
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.
Check cable and supply before replacing boards
What they doThe technician checks terminals, cable continuity and supply to both units before proposing a board.
They must show youthe terminal condition and the voltage at both units.
In writingwhat was corrected or which board was replaced and why.
Operating test
What they doAfter the repair the technician runs the unit and checks the code does not return.
They must show youthe unit running with no code.
In writingdate and 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.
Power cut at the switch
- Who:
- you.
- How:
- cut power to the air conditioner at its switch or the consumer unit, wait a few minutes and restore it.
- Result that matters:
- whether 101 or 102 reappear at switch-on.
- If they do not return:
- it was a one-off fault; note the date.
- If they return:
- continue with the checks or contact Samsung support.
- Evidence to keep:
- a photo of the display and a note of each occurrence.
Evidence: Samsung: ¿Qué hacer cuando aparece el error 101/102 en el display?
Power to both units
- Who:
- you.
- How:
- check at the consumer unit that no air conditioner breaker has tripped and, if the outdoor unit has its own isolator, that it is on.
- Result that matters:
- that indoor and outdoor units both have power, as Samsung asks.
- If a breaker had tripped and trips again:
- do not reset it again; call a technician.
- If both have power:
- suspicion moves to the cable or the boards.
- Evidence to keep:
- a photo of the consumer unit showing breaker positions.
Evidence: Samsung: ¿Qué hacer cuando aparece el error 101/102 en el display?
Cable between units
- Who:
- you, by eye only; the technician, at the terminals.
- How:
- without touching or opening anything, look along the visible run of cable between units for cuts or loose sections; the technician checks the terminals with power isolated.
- Result that matters:
- whether the cable has visible damage or loose wires at the terminals.
- If you see damage:
- do not touch it and call the technician.
- If nothing is visible:
- the technician must check terminals and boards.
- Evidence to keep:
- a photo of the visible cable run.
The connecting cable may carry mains voltage: look without touching; any terminal check is technician work with power isolated.
Evidence: Samsung: ¿Qué hacer cuando aparece el error 101/102 en el display?
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
- 1 01
- 102
- caldera Chaffoteaux 101
- Chaffoteaux 1 01
- Chaffoteaux 101
- Chaffoteaux boiler 101
- E101
- E102
- Error 101 Chaffoteaux
- Pigma 101
- Pigma Advance 101
- RESET 101 Chaffoteaux
- Samsung 101
- Samsung 102
What it means
Samsung explains that codes 101 and 102 indicate a communication problem between the units of the air conditioning system. Its steps are to cut power at the switch, wait a few minutes, check there are no loose or disconnected cables between indoor and outdoor units and confirm both receive power; if it stays, contact its support. The code does not say whether the cause is the cable, the supply to one unit or a board: the technician confirms that.
Warnings and stop conditions
- Higheditorial warning
Samsung refers this code to an authorized service center. Do not open the unit: it carries mains voltage and, outdoors, the refrigerant circuit, which only an F-gas certified technician may work on.
Evidence: Samsung: ¿Qué hacer cuando aparece el error 101/102 en el display?
Symptoms and causes
Probable causes · in order
- One-off communication dropPossible
Clears with a power cut of a few minutes; it shows because the code does not return after the reset.
Evidence: Samsung: ¿Qué hacer cuando aparece el error 101/102 en el display?
- Loose or disconnected cable between unitsPossible
Samsung asks for this cable to be checked; a damaged or loose cable keeps the code after the reset.
Evidence: Samsung: ¿Qué hacer cuando aparece el error 101/102 en el display?
- One unit without powerPossible
Samsung asks you to confirm both indoor and outdoor units have power; a unit without power cannot communicate.
Evidence: Samsung: ¿Qué hacer cuando aparece el error 101/102 en el display?
Virtual technician
Does 101 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: ¿Qué hacer cuando aparece el error 101/102 en el display?
Samsung Electronics · 2026 · official_doc
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