Tadiran AC Error Code E3 — Communication Error Fix

What Does This Error Mean?

E3 on a Tadiran AC is a communication error — the indoor and outdoor units have lost the signal they send to each other through the interconnecting cable. The most common causes are a loose communication wire, a power issue at the outdoor unit, or a PCB fault. A full power cycle often clears E3 if it was caused by a power glitch.

Affected Models

Tadiran Inverter Split AC
Tadiran Breeze Series
Tadiran T-MAX Series
Tadiran Coral Series
Tadiran Split AC (all inverter models)

Common Causes

Communication wire between indoor and outdoor unit loose, broken, or disconnected
Outdoor unit not receiving power — tripped breaker or disconnected isolator switch
Voltage fluctuation or power outage disrupting the communication handshake
Outdoor PCB fault preventing it from responding to the indoor unit
Indoor PCB communication circuit fault
Rodent or weather damage to the inter-unit cable

How to Fix It

Check that the outdoor unit has power.

Go to the electrical panel and look for a tripped breaker for the AC circuit. Also check for an isolator switch near the outdoor unit — these can accidentally be switched off.
Turn off the AC at the main circuit breaker, wait 60 seconds, and restore power.

A complete power cycle resets both PCBs simultaneously. E3 caused by a power interruption or voltage event usually clears this way.
After restarting, listen for the outdoor unit starting up.

The outdoor unit should start within 3 minutes of the indoor unit being switched on. A completely silent outdoor unit suggests a power or outdoor PCB problem.
If E3 persists after a power cycle, call a Tadiran technician.

The technician will test the signal wire with a multimeter and identify which end of the communication circuit is at fault.

When to Call a Professional

If a full power cycle does not clear E3, a Tadiran authorised technician is needed. Communication wiring runs between two units and may require specialist tools to trace and test.

Frequently Asked Questions

Why does Tadiran E3 appear after a power cut?

When power is cut and then restored, the indoor and outdoor PCBs restart at slightly different times. Occasionally the communication handshake fails during this restart sequence, triggering E3. A deliberate power cycle — breaker off for 60 seconds, then on — gives both units a clean simultaneous restart and usually resolves this.

Can E3 be caused by an installation error?

Yes — if the signal wire was not connected correctly during installation, E3 will appear immediately on first startup. The installing company should correct this at no charge.