Display shows E8; unit may heat only intermittently or not at all.

High-voltage safety: Only perform these checks if you are familiar with electrical work. Otherwise, contact an electrician. Always turn OFF the breaker before opening junction boxes.

Verification steps:

• Confirm the Eemax model's required voltage (e.g., 240 V) from the rating label inside the unit or on the cover.
• With power OFF, remove the front cover and inspect the line voltage connections at the terminal block. Tighten any loose lugs to manufacturer torque specs.
• Restore power and carefully measure voltage at the heater's input terminals with a multimeter. It should match the specified range (e.g., 240 V ±10%).
• If voltage is significantly low under load, check for undersized wiring, long runs, or loose connections in the supply circuit. Correct as needed.
• Verify that the breaker size and wire gauge match Eemax installation requirements.
• If the supply voltage is correct and stable but E8 persists, the control board voltage sensing circuit may be faulty and require replacement.

Do not operate the heater on incorrect voltage; it can damage elements and electronics.