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Our ceiling fan is exhibiting an odd behaviour: it starts up nice and fast with a pleasant breeze, but after ~10-20 minutes abruptly slows to a total crawl (around 20 RPM or so). After a minute or two of this, it speeds back up again, then slows down again a minute later, etc. The slow periods get longer and longer until it just stays slow.

The fan is a "Model D5201", no manufacturer on the label (there's an Intertek number on it). It came with a remote control with three fan speeds; using the different fan speeds would cause the fan to spin at an appropriate speed for a bit before slowing down.

I removed the remote control receiver unit, but it still behaves the same way. Right now I have it wired directly to the wall switch without the receiver.

My first thought, as with Ceiling Fan Not Spinning Normally, Replaced Capacitor Already, was to replace the capacitor, so I ordered a brand-new 3.5uF capacitor off Amazon and swapped it in. No dice - still slows down. I've checked the blade balance (seems fine), fan rotation (spins freely and smoothly), and the built-in halogen light works fine.

What might be the problem with this fan?

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  • Would check all wire connections for tightness, at fan and switch. Vibration and/or heat might be cause a bad connection/low voltage, fan slows down and cools and speed comes back up.
    – crip659
    Jul 22 at 1:16
  • does the fan feels hot to the touch
    – Ruskes
    Jul 22 at 1:44
  • The fan housing feels a bit hot, but not excessively so. I’m disassembling the fan now to check wire connections, but so far everything seems ok…
    – nneonneo
    Jul 22 at 1:46
  • Check the brushes for the brush motor, take them out and rotate 180 Dgr
    – Ruskes
    Jul 22 at 1:48
  • Ok. I’m not entirely sure how to open the motor. It’s the MT-515, pictured here: diy.stackexchange.com/questions/250291/…. There are four screws on the top and four on the bottom - I’ve popped out all of them but the housing doesn’t budge :(
    – nneonneo
    Jul 22 at 2:09

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