My old Sanyo SAP-KRV123EHA had a noisy ball bearing in the indoor fan unit. Since Sanyo is no longer making these units I tried replacing the fan bearing with ceramic ones. After assembling the motor, it can spin freely when no power is on, but a humming sequence can be heard when powered by the control PCB. And the motor seems to be braked to stand still. My guesses are:

  1. I broke a wire to the hall sensor

  2. the capacitor is fried, but it shouldn't get firmly stuck because of that?

Any other ideas? Before I start chasing a new motor.

Motor disassembled:


  • 1
    You might try posting on electronics stack exchange instead... good luck. Commented Nov 1, 2019 at 13:35
  • In the end I got a replacement motor which worked out of the box.
    – Dejvid_no1
    Commented Nov 3, 2019 at 22:39

1 Answer 1


The problem was that I had broken one of the Hall sensor wires. In the end I got a new motor. Re-mounting the old one wasn't feasible since I had disassembled it by bending open the rolled/pressed metal enclosure.

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