Marey heater shows E9 and will not operate; may occur after a power surge or wiring change.

Safety first: Turn OFF the circuit breaker and verify power is disconnected before opening the unit.

Steps:

• Verify supply voltage: Confirm that the heater is connected to the correct voltage (e.g., 120V or 240V) as specified on the rating label. Using the wrong voltage can damage the unit.
• Check terminal block: Remove the front cover and inspect the power terminal block. Tighten any loose screws and look for signs of overheating or melted insulation.
• Inspect internal fuse: Some Marey models have an internal fuse on the control board. If accessible, check if it is blown and replace only with the exact same type and rating.
• Reset breaker: After correcting any wiring issues, reset the house breaker and test the unit.

When to call a technician: If the E9 persists, the main control board’s power supply section may be damaged and require professional replacement.