Likely the start of your PCB problems. The PCB on Deka fans have extremely short lifespans. The technician replaced mine and it barely lasted a week, with its replacement dying right when the service warranty did (1 year). Just change to a different brand, it's not worth paying Deka >RM100 every year to fix the thing.

Does anyone know the problematic part on the PCB? Will changing the capacitor fix it?

I have suspicions the technician used a poorly refurbished PCB as a replacement. Not like the "new" board was any good either. A permanent fix some independent electricians do is to bypass the PCB entirely and wire the motor straight to a capacitor. YMMV. And make sure they put a fuse somewhere in there. Don't start a fire.

I'm trying to DIY the bypass and the output to the motor has 6 pins which is confusing me. Board markings only note pin 1-4 as speeds (L, M, H, HH) and are fed by Live while 5 and 6 is switched by the relay (reverse direction) and goes to the 4uF capacitor which goes to a fuse and Neutral (also resistors and ground). Does anyone have a wiring diagram for the 4-speed w/ reverse fans with the the 6 pin motor input?

This post has been edited by a_capybara: Feb 7 2020, 04:23 PM