Question about Bionaire BH3900-U Oil Filled Radiator Heater

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Bionaire BH3950 Does not heat

My heater just wont heat, the power light is on but the appliance will not produce any heat even if it is turned on to high. On the opposite side it has instructions in case it shuts off. It says to turn mode to OFF and thermostat to high, unplug and then wait 30 minutes. After that you plug it back in and turn mode to on and tara! it should work... Well I did that exactly more than 10 times already and it doesn't do anything for this heater to work back again. I don't know whatesle to do. Please help!!!

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  • Anonymous Nov 20, 2008

    wont work at all either

  • Anonymous Dec 03, 2008

    Just bought mine, took out of the box, and the green light won't come on, hence, the heater isn't working. I'm taking this piece back tomorrow and getting something else. I am freezing.

  • alacazaba Dec 27, 2008

    Same problem as Pocahontasz. No heating at all despite the lights being on. Only used it one season, too, and lightly at that. I'm guessing the thermostat might be no good but maybe I'll plug it again to see if I can hear any "clicks" as the thermostat is kicking in.

  • Anonymous Mar 22, 2014




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I'm not an expert, but I have two of these units that are working fine.

The on/off switch (the top switch) has a light in it that illuminates when the heater is on and heating. If this light comes on and there is no heat, then the element is probably burned out.

The heater has a safety switch that prevents the unit from working if it is not upright. If the heater was stored for any length of time on its side, the safety switch might have stuck in the off position. Unplug the heater and with the heater upright, try shaking it or slapping it firmly with your hand to se if this fixes the problem.

If none of this works, then as sunmasc says, the thermostat is bad.

Posted on Feb 03, 2008

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The thermostat seems to be faulty or the heating element is burnt out.

Posted on Jan 12, 2008


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My Bionaire BCH9221um wont turn on.

You might want to open it up and check the thermal fuse. This is usually a small cylindrical device with a cone at one end and wire leads coming out of both ends. It opens permanently when it gets over a certain temperature, and sometimes will open prematurely. Check it for continuity with an Ohmmeter. If it is open, then it is the problem. You can usually read the temperature, or a part number on the side. Look it up on the web, or go to your local electronics parts store. You can get one for a buck or two. Replace it by crimping it on to the wires, do not attempt to solder it, as the heat will likely destroy it.

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If an appliance that should produce heat does not, inspect the element for breaks or obvious damage. If you don't see any damage, test the element for continuity (see below).
  1. Turn off power to the appliance or device. If the unit is plugged in, unplug it from the electrical receptacle (outlet); if the device is wired into the circuit (such as an oven), turn off the circuit at the electrical service panel.
  2. Disassemble the appliance or device to access the heating element, following the guides in this book for your appliance. Some heating elements, such as plug-in units in electric ovens, are relatively easy to remove (see the Electric Oven Fix-It Guide).
  3. Set the multimeter to RX1 (resistance times 1).
  4. Touch the multimeter probes to each end of the element.
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  6. If a heating element is faulty, replace it with one of the exact size, shape, power rating, and resistance.
  7. Reassemble the appliance or device and turn it on or plug it in to test it.

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this happens when you have run a heater for a long time on an outlet that is either not giving the heater enough amperage or to much amperage try it in a different room if the problem persists try a different heater.

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Have a over the stove microwave has power light,turn table, timer work but wont heat food

If everything works, but the microwave oven does not heat, this is commonly caused by a failed magnetron. The magnetron is the heart of the microwave oven and produces the RF energy that heats your food. In order to replace a defective magnetron, you will need to consider the following:

1. You will need to uninstall the oven from over the range in order to replace the part (you will need to do this anyway, if you decide to buy a replacement oven).

2. Ensure the oven is UNPLUGGED before servicing anything inside the cabinet and remove the exterior case in order to access the magnetron. The High Voltage circuit in these ovens produces between 3,000 and 4,000 VAC and should NOT be worked on unless you are saavy with electronics. In addition, these ovens should NEVER be turned on, or serviced with the exterior cabinet removed, interlocks defeated or high voltage network protective cover removed.
Here are several websites that you can use that illustrate how the oven is assembled: is another great website for parts, and has part illustrations/photographs, but does not have the exploded view to show how the appliance is assembled.

NOTE: If you've never repaired an appliance on your own before, a microwave oven is usually not a recommended appliance to start with. Some models can be rather involved in taking apart.

3. The magnetron replacement cost will depend upon the MODEL NUMBER and generally costs between $100 and $200.

Use your appliance model number and review the parts illustrations at the recommended websites to identify and locate parts, and to see if this is something that you may be able easily take apart and reassemble.

NOTE: If your appliance is still under warranty, do not attempt to repair on your own, as this will void any warranty you may still have. Most manufactures have a one year limited warranty against any manufacturer defects, but may have extended warranties on certain parts. If in doubt, contact the manufacturer to find out what is covered.

If you have any questions, please post back and let me know. I hope you find this information helpful.

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