Question about Lasko 5540 Ceramic Compact Heater

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Keeps shutting off

Heater keeps shutting off ater short operation.have tried cutting off for ten minutes as suggested in manual instructions, have also checked the timer, but heater runs for a awhile and continues to shut off.

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Re: keeps shutting off

I have a LASKO 5565 model fan and had a similiar problem. Cleaned the whole unit, thinking it was tripping the safety breakers, and it still would turn on and off. The control console was completely unusable. So then I thought that it was maybe the squat switch located on the bottom of the unit. I quickly deduced that not to be the problem and continued following the wiring. Just above the fan there is a 1/2"X1/2" thermostat. Upon touching it I almost burned myself. For some reason the unit was grounding here and cause the thermostat to heat up and shut the unit off. I took the thermostat out of the equation and the unit works great.

CAUTION: If you pursue this action you must understand that you no longer have a thermostat and the unit is now simply just a heater. It will either be on at full blast heat or it will be off. Good luck.

Posted on Nov 20, 2008

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Re: keeps shutting off

I had one of these that would immediately start to heat up when just plugging into the wall without turning it on! Then it would shutdown from an overheat condition. I found the bad part! Mouser Part #: 771-BT139-800E127
I think the one that was in there was rated 600v, so this 800v is much better. I think this is a hazzard if you ask me. When that part goes out it creates a shorted condition. I put a watt meter on it and it was drawing over 1700 watts. But after replacing the part its been working great since then.

Posted on Jun 15, 2011

Re: keeps shutting off

Omg it does the same thing for me.

Posted on Mar 09, 2008

Re: keeps shutting off

Please help I have the same problem

Posted on Feb 13, 2008

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The heater should function properly once the dust is blown off the sensor.

Good luck!

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