20 Most Recent Holmes Products HRH316 Mid-Size Heater Questions & Answers

The problem is most likely the over heating sensor thermostat located directly under the heating elements - The reason the over-heat safety thermostat sensor is tripping the warning buzzer is because either the cool air fan intake is obstructed with dust / dirt, or the fan motor stopped rotating, or the over-heating condition thermostat is defective, or over sensitive - Usually when the cool air intake is obstructed for any reason, the heating elements will glow brighter, and hotter without good air flow, and the elements may start to bow downwards closer to the over-heating safety thermostat - However, if the safety thermostat is defective, it can trigger the warning buzzer even though there may not be an over-heating condition / event present - The buzzer warning going off prematurely also occurred with my Holmes space heater - I checked the air flow first, and then the appliance tip-over switch second - Both were found functioning properly - It wasn't until I replaced the safety over-heating thermostat, did the buzzer stop going off moments after I plugged the space heater in an outlet.

The problem is most likely the over heating sensor thermostat located directly under the heating elements - The reason the over-heat safety thermostat sensor is tripping the warning buzzer is because either the cool air fan intake is obstructed with dust / dirt, or the fan motor stopped rotating, or the over-heating condition thermostat is defective, or over sensitive - Usually when the cool air intake is obstructed for any reason, the heating elements will glow brighter, and hotter without good air flow, and the elements may start to bow downwards closer to the over-heating safety thermostat - However, if the safety thermostat is defective, it can trigger the warning buzzer even though there may not be an over-heating condition / event present - The buzzer warning going off prematurely also occurred with my Holmes space heater - I checked the air flow first, and then the appliance tip-over switch second - Both were found functioning properly - It wasn't until I replaced the safety over-heating thermostat, did the buzzer stop going off moments after I plugged the space heater in an outlet.

Wiring diagram for a 3-way switch, one of the many wiring diagrams showing different methods of wiring a three way switch circuit. This electrical wiring diagram shows power into light switch Box #1 – wire to light from switch box #1, and from switch box #1 to three-way light switch box #2.

Probably the thermostat contacts have become worn and a certain amount of arcing is happening when they close. Replacement thermostat units used to be easy to change and were readily available for quality domestically manufactured oil filled radiators but these days it would probably be cheaper to buy an imported heater. You wouldn't lose by asking your local supplier and if they are still available check the internet price. It would be wise to check the wiring and internal connections before junking it.

check your fuses, may have blown the heat side. If fuses are good, and still no heat? replace the unit.

It is more cost effective to replace the unit.

First, check the warranty to see if it still in effect. I suspect a bad contact, broken control or problem with the heater element connections. If there is no physical damage from being dropped, tripped over, etc., then something like this would be a manufacturing defect (premature failure). If it's out of warranty, and you know how to use a multimeter, you could unplug the heater and start checking the continuity of the parts and wiring inside.