mypros+
Error code reference

Samsung Air Conditioner Error Code 17

Outdoor unit outdoor temperature sensor error (open or short).

Samsung codesSamsung air conditioner codes

Outdoor unit outdoor temperature sensor error (open or short).

First step from the service manual

Check outdoor temperature sensor resistance at PIN#1,2 of CN51 on outdoor control board.

The complete diagnostic procedure includes additional test steps, resistance specifications, wiring diagram references, and component test points.

MyPros+ Max

Get the full diagnostic procedure for 17.

  • Step-by-step tests with expected resistance, voltage, and continuity values
  • Wiring diagram references and connector pinouts from the OEM service manual
  • Verified part numbers when replacement is required
Get the full procedure

$29/month · Cancel anytime · Or $9.95 3-day pass

What 17 means on a Samsung air conditioner

Samsung air conditioner error code 17 indicates a fault with the outdoor ambient temperature sensor located on the outdoor unit. This sensor is a negative temperature coefficient (NTC) thermistor that continuously monitors the outdoor air temperature and feeds that data to the outdoor control board. The system uses this reading to regulate compressor operation, adjust refrigerant flow, and manage defrost cycles. When the control board detects a signal outside the expected resistance range at PIN#1 and PIN#2 of connector CN51, it flags error code 17 and may limit or disable operation to prevent equipment damage.

The fault condition can be either an open circuit or a short circuit. An open circuit occurs when the thermistor resistance climbs excessively high, often due to a broken wire, corroded connector pin, or a failed sensor element. A short circuit occurs when resistance drops abnormally low, which can result from damaged insulation causing wiring to contact the chassis, or from a thermistor element that has internally failed. Both conditions produce sensor readings that fall outside the control board's acceptable operating window.

Diagnosis begins at connector CN51 on the outdoor control board. Technicians should disconnect the sensor and measure thermistor resistance directly across the sensor leads. A properly functioning NTC thermistor will show a resistance value that corresponds predictably to the current ambient temperature. Readings of zero ohms or infinite resistance confirm a shorted or open sensor, respectively. The wiring harness between the sensor and CN51 should also be inspected for chafing, corrosion, moisture intrusion, or physical damage before condemning the sensor itself.

Source: manufacturer service documentation.

Common causes of 17

  1. 01

    Failed outdoor temperature sensor (thermistor)

    Part replacement

    The NTC thermistor element itself has failed internally, producing either no resistance or infinite resistance. This is the most frequent cause and is confirmed by measuring resistance directly across the sensor leads disconnected from CN51.

  2. 02

    Corroded or damaged connector at CN51

    Wiring / connection

    Moisture and oxidation at PIN#1 or PIN#2 of connector CN51 on the outdoor control board can create a false open or intermittent circuit. Inspect the connector pins for green or white corrosion and clean or replace the connector as needed.

  3. 03

    Damaged sensor wiring harness

    Part replacement

    The wiring between the thermistor and CN51 can chafe against sheet metal edges, vibrate loose, or suffer rodent damage, creating an open or short circuit. Visually trace the harness and use a multimeter to check for continuity and insulation integrity.

  4. 04

    Moisture intrusion into sensor housing

    Part replacement

    Water entering the sensor body can short the thermistor element or cause erratic resistance readings. Signs include visible water tracks or discoloration near the sensor mounting point on the outdoor unit.

  5. 05

    Faulty outdoor control board

    Part replacement

    If the sensor and wiring both test within normal parameters, the CN51 input circuit on the outdoor control board may have failed. This is the least common cause and should only be considered after the sensor and harness are ruled out.

See the test procedure for each cause

Frequently asked questions about 17

What does 17 mean on a Samsung air conditioner?
Error code 17 on a Samsung air conditioner indicates an outdoor ambient temperature sensor fault on the outdoor unit. The control board has detected either an open circuit or a short circuit at the sensor connected to PIN#1 and PIN#2 of connector CN51. This prevents the system from accurately reading outdoor air temperature, which is required for safe and efficient operation. The unit will restrict or stop operation until the fault is corrected.
Can I fix Samsung error code 17 myself?
A knowledgeable DIYer can perform basic checks such as inspecting the wiring harness for visible damage and examining the connector at CN51 for corrosion. However, accurately diagnosing the fault requires a multimeter to test thermistor resistance values. Replacing the thermistor sensor is a straightforward repair once the correct part is sourced, but any work involving the control board or refrigerant system should be handled by a certified technician.
Is it safe to run my Samsung air conditioner with error code 17 active?
Running the unit while error code 17 is active is not recommended. The outdoor temperature sensor informs critical control decisions including compressor protection and defrost cycle management. Without a valid sensor signal, the system may operate outside safe parameters or may already be locked out. Continued operation in a faulted state could lead to compressor damage or reduced equipment lifespan.
How much does it cost to repair Samsung error code 17?
If only the outdoor temperature sensor needs replacement, parts typically range from $15 to $60 depending on the model, and labor costs for a service visit generally range from $80 to $200. If the outdoor control board is at fault, parts alone can range from $100 to $350 or more. Getting a diagnostic visit first is advisable so the technician can pinpoint the failed component before ordering parts.
Will resetting my Samsung air conditioner clear error code 17?
A power reset may temporarily clear the error code from the display, but the fault will return as soon as the control board re-checks the sensor signal at CN51. Error code 17 reflects an actual hardware problem with the sensor or its wiring, not a transient software glitch. The underlying cause must be diagnosed and repaired for the code to clear permanently.

Related Samsung air conditioner codes

All Samsung air conditioner codes
View all 572 Samsung air conditioner codes

78,000+ service manuals · 160,000+ error codes · 55+ brands

Get Started

$29/month · Cancel anytime · Or $9.95 3-day pass