duraflame space heater keeps beeping

HOMCOM Ceramic Space Heater, Tower Heater with 45 Degree Oscillation, Remote Control, 24H Timer, Tip-Over and Overheating Protection, 1500W/1000W

VEVOR Infrared Heater 1500W Electric Space Heater 3 Heat Settings Black, with Remote Control for Outdoor Use, 24 Hours Timer, Premium Aluminum, Black

Etust 24" Infrared Space Heater, 6 Quartz Heating Tubes Tower Heater with ECO Energy-Saving Mode, Portable Room Heater

Optimus Fan Forced Tower Quartz Heater with Thermostat

Aiwa 18” Indoor Ceramic Space Heater, 1500W 60° Oscillating Electric Tower Heater, High/Low/Fan Modes

TEMPWARE Electric Fireplace Heater 1500W, Portable Fireplace with Realistic 3D Flame Effect, Quiet and Safe for Indoor Use Office Bedroom

AT-SH26 Space Heater, 1500W Portable Electric Desk Heater, 900W Low Heat, ECO Thermostat, Fan-Only Mode, Oscillation & Remote, White

Perfect Aire 128 sq ft Electric Ceramic Space Heater

ROVSUN 125,000 BTU Forced Air Propane Heater with 10ft Hose & Regulator,Portable Space Heater for Garage & Workshop,Black

Electactic Portable 1500W Indoor Space Heater with Thermostat, 5 Heating Modes, 24H Timer, Remote, Quiet Operation, Tip-Over

ROVSUN 32" Electric Baseboard Heater with Remote,Convection Space Heater with 3 Heat Settings, Humidifier & Timer,White

Pelonis 22'' Digital Convertible Ceramic Tower Heater

Brentwood 600 Watt Portable Space Heater in Black

Lasko - Electric - Tabletop - Space Heater

Electactic 24-Inch Freestanding Electric Fireplace Stove, Remote, Adjustable Flame Color and Brightness, Thermostat, Timer and Quiet Mode

1500W Portable Oil Filled Radiator Space Heater with Adjustable Thermostat and 4 Wheels

Brentwood® Portable Electric Space Heater and Fan, 1,500/750 Watts/Fan Only, 5,000 BTUs, Adjustable Thermostat, Safety Features, 6-Ft. Cord, H-F3...

Aiwa Oscillating Room Heater with Handle, Overheat Protection, Tip over Auto Shutoff - Silver

EAGLE PEAK 2 PCS 1500W Indoor Space Greenhouse Heater, Spray Water Resistant IPx4, Over-heat Protection

Etust Electric Fireplace Heater, 3D Flame with Adjustable Brightness, Timer & Safety Protection, Indoor Space Heater 22.3"

R.W.FLAME 1500W Quiet Portable Space Heater, PTC Ceramic Electric Heater with Remote, Oscillation, Fast Safe Heating for Office Bedroom Desk

VOLTORB Freestanding Portable Electric Space Heater for Bedroom or Indoor Use with LED Display, Remote Control, and Fan Only Mode (3 Pack)

DR. INFRARED HEATER DR-968H Electric Portable Space Heater with Humidifier, 1500W, Cherry