-
1
Confirm the error code
Look at the heater screen or controller. If E3 error code is displayed, the system has detected an abnormal heat exchanger condition and entered safety protection mode.
Look out for:E3 error code shown Heater shuts down shortly after starting -
2
Observe heater behaviour
Turn on the hot water tap and observe how the heater behaves during operation. A heat exchanger fault will usually cause unstable heating or sudden shutdown.
Check for:Heater ignites but stops after a short time Hot water temperature fluctuates -
3
Look for external warning signs
Although the heat exchanger is an internal component, there are external signs that may indicate internal deterioration.
Typical Symptoms:Water dripping or moisture below the heater Rust marks or corrosion on the casings -
4
Understand what E3 usually means
This error code indicates an internal heat exchanger problem that affects heating stability and safety.
What it indicates:Internal heat exchanger corrosion or leakage Abnormal temperature detection due to a damaged exchanger -
5
Do not continue using the heater
Continuing to operate the heater after an E3 error may cause further internal damage and safety risks.
Why it matters?Continued operation may worsen internal damage Professional inspection is required for safety
