How can I troubleshoot an E1 error on my portable electric space heater?

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Grade: Education Subject: Support
How can I troubleshoot an E1 error on my portable electric space heater?
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For a portable electric heater, first turn it off and unplug it. Check for any obstructions around the air intake or output vents, such as dust, lint, or nearby furniture, and clear them. Ensure the heater is on a flat, stable surface with adequate clearance. Let it cool down for at least 15-30 minutes, then plug it back in and try turning it on. If the error persists, it might indicate an internal sensor malfunction.