Question about Lasko 5132 Ceramic Compact Heater

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Heater keeps shutting off !!

Heater shuts off after running about 10 minutes,I will unplug it for about 15 minutes to about an hour and when I plug it back in,it will only run for about 5-10 minutes before it shuts off again!!

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Re: heater keeps shutting off !!

I have model 5532, but I think they all have the same problem. There seems to be a safety device in the ceramic heater that turns off if it gets too hot. It "remembers" when this happens as well and will shut off until it is unplugged for 10-15 minutes.

This happens on even lightly used heaters if used in dusty conditions. Dust builds up behind the ceramic heater and the lack of flow causes it to overheat. The unit must be dismantled and the dust brushed/vacuumed out. The good news is that not only will the heater work again, but it will have better airflow too!

To do this, tech support and other people say to "clean the rear grill", but my rear was not dirty. The front grill had some dust that I vacuumed clean, but did not help. In my unit there are no filters before the air goes through the heater element. The problem is in the center of the heater. Taking out the internal fan (four screws on the sides of the squirrel fan box), I could see that the radiator was over half covered in dust. I cleaned that dust out using a shop vac and the problem went away.

Opening the heater was a little tricky, two of the screws were triangle head screws. Once inside, however, it is a simple proceedure to remove the fan. Of course, you should unplug the heater and wait a while before opening it up to make sure there are no electrical charges stored in the unit.

Posted on Apr 05, 2008

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Re: heater keeps shutting off !!

I pulled my heater apart to find out what to problem was. Using a screw extractor I removed the two security screws, if you can find the the tip for these triangular screws even better. The others you can use a phillips screwdriver. 
Mine was basically clogged with dirt causing the heater to overload and shutting off after just a few minutes.  I had a can of compressed air duster that I use when i clean up my computer i dusted the leaving it clean like a whistle. 
It did the job for me. 

Posted on Apr 01, 2008

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Re: heater keeps shutting off !!

Mine was doing the same thing. cutting off after 5 or 10 min.i vacumed the back vents really well witha an upolstery brush, and it works fine now.

Posted on Jan 16, 2009

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Re: heater keeps shutting off !!

It can be very dangerous for a heater to not be working properly. My family's last home caught on fire from a malfunction that we kept putting off. You should call up your local heating services to see what their advice would be. They could probably tell you over the phone what you can do or, better yet, come and repair your heater. HEATING SERVICES FOR THE LINCOLN NE AREA

Posted on Aug 19, 2015

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Re: heater keeps shutting off !!

I figured it out before getting on here. heater strains to work if air flow is blocked and shuts down from overheating. its just doing its job before it catches fire and possibly killing you and your loved ones live clean live good stay warm

Posted on Jan 16, 2015

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Re: heater keeps shutting off !!

1) Have unit taken apart and professionally cleaned by someone you know.

2) Use compressed air and blow out all lint from front, back, and top of unit.
Make sure you run it outside the first time after you do this so the remaining
loose dirt won't be blow in your house.

Posted on Apr 26, 2012

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Re: heater keeps shutting off !!

Every heater has a thermal sensor called a thermistor, or thermal resistor, that is used for temperature control. Same thing for hair dryers. After a while they can get sensitive to being heated and cooled and start to fail. When it fails again, take an air source and blow clean, cool air over the unit and see how long it takes to restart. If it starts within a few minutes of being cooled, than I would look at the thermistor.

Posted on Jan 22, 2008

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My heater will fire up with no problem, run for 5 - 15 minutes then shut off. I can unplug it then plug it back in and it will run for another 5 - 10 minutes and shut off again. There's no theremostat so...

Hi and welcome to FixYa, I am Kelly.

Download this service manual:

You may have a dirty Photocell as discussed on page 19 but you can have other issues. The manual will help you sort it out.

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Reddy heater model r100a runs approxamitly 15 to 20 minutes then kicks seems to run fine and already replaced the spark plug.

generally if a heater with a spark plug will run for 10 minutes or longer then that’s an indication that the electronics are functioning properly, so for now, eliminate "any fuel delivery problems" before trouble shooting the electronics. The spark plug should spark for the duration of the run time. If the flame goes out the heater shuts down (just like its designed to do). Imagine the fumes & danger involved if the heater continued to pump raw fuel into a hot combustion chamber!

Some possibilities:
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  2. the air pump pressure is not correct. (instructions at )
  3. the fuel filter is restricted.
  4. the nozzle is restricted or worn.
  5. there is an air leak between the pump & the nozzle.
  6. water in the fuel. When a droplet passes through there is a momentary flameout condition which will cause the photocell to shut the unit down.
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Pro 110, runs 10 min., blows white smoke ,shuts off

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