Samsung Air Conditioner Error Code TIMER_FLICKER

TIMER_FLICKER indicates a fault with the indoor unit room temperature sensor, detected as either an open or short circuit condition. The control board monitors the NTC thermistor at connector CN43 and triggers this error when the resistance reading falls outside the acceptable range. The unit cannot regulate cooling properly while this fault is active, so normal operation is suspended until the issue is resolved.

Running the unit with an active TIMER_FLICKER fault is not recommended. Without a functioning room temperature sensor, the control board cannot accurately regulate system operation, which can lead to improper cycling, reduced efficiency, or potential stress on other components. It is best to address the fault before returning the unit to regular use.

A power reset may temporarily clear the error display, but the fault will return almost immediately if the underlying sensor or wiring problem has not been corrected. The control board will re-detect the out-of-range resistance at CN43 as soon as it performs its next sensor check. A permanent fix requires repairing or replacing the faulty component rather than relying on resets.

A knowledgeable DIYer can check the sensor connector at CN43 for loose connections and inspect the wiring harness for visible damage without specialized tools. Measuring thermistor resistance with a multimeter and comparing it to the expected value for the current room temperature is also within reach for someone comfortable working inside the indoor unit. However, if the PCB or refrigerant system is involved, a licensed HVAC technician should handle the repair.

If only the room temperature thermistor needs replacement, parts typically cost between $10 and $40 depending on the model, with labor adding $75 to $150 for a professional service call. If the indoor PCB has failed, the repair cost rises considerably, often ranging from $150 to $350 or more including parts and labor. Getting a diagnostic visit first will help confirm exactly which component needs replacement.