Tadiran Error F3 — Discharge Pipe Temperature Sensor Fault

What Does This Error Mean?

Tadiran Error F3 means the discharge pipe temperature sensor on the outdoor unit has failed or is reading an abnormal value. This sensor monitors how hot the refrigerant gas is leaving the compressor — a critical safety measurement.

Affected Models

Tadiran Inverter Series
Tadiran Alpha
Tadiran Superior
Tadiran Elite

Common Causes

Discharge pipe temperature sensor (NTC probe) has failed
Sensor wire is disconnected or corroded
Actual discharge temperature is genuinely too high (refrigerant low, compressor issue)
Outdoor PCB input circuit for the sensor has failed

How to Fix It

Reset the unit

Turn off at the wall breaker for 5 minutes, then restore. If F3 clears and the unit runs normally, it may have been a transient temperature spike.
Check outdoor unit clearance

Ensure there is at least 50 cm of clear space around the outdoor unit for airflow. Restricted airflow raises compressor discharge temperatures. Remove any obstacles, plants, or debris.
Do not run the unit repeatedly

If F3 returns each time you restart, stop attempting to use the unit and call a technician. A genuine discharge overtemperature condition can permanently damage the compressor.

When to Call a Professional

Yes — discharge pipe sensor replacement and diagnosis requires an HVAC technician with refrigerant handling certification.

Tadiran Error F3 — Discharge Temperature Protection

The discharge pipe sensor monitors the temperature of refrigerant gas immediately after it leaves the compressor, at its hottest point. This is one of the most critical safety measurements in an air conditioning system.

Too high a discharge temperature means the compressor is under severe stress — possibly because refrigerant is low, the outdoor coil is blocked, or the ambient temperature is extreme. Running the compressor in this state can destroy it within minutes.

Why Not to Ignore F3

Compressor replacement is one of the most expensive air conditioner repairs — often $600–$1,500 or more. A timely technician visit to resolve an F3 fault (likely a sensor replacement costing $80–$150) prevents a far more expensive breakdown.

Frequently Asked Questions

Is F3 a sensor fault or a real overtemperature?

Both are possible. If the sensor is faulty, it will report an impossible temperature even when everything is fine. If refrigerant is low or the compressor is stressed, the temperature may genuinely be too high. A technician will use a manifold gauge set to determine which is the case.

What temperature triggers F3 on Tadiran units?

F3 typically triggers when discharge temperature exceeds 110–120 °C (depending on model). Normal operating discharge temperature is 60–90 °C. Values above 110 °C indicate a refrigerant issue or a compressor problem.