Volume knob stop working

Also how do I reconnect the fan?
It sounds like you may have a broken potentiometer (aka volume knob) for the master volume control. If that is the case, you would need to replace it with a new one (or take it to an electronics technician to diagnose and repair).
Regarding the fan disconnection, this likely isn't causing your issue but you would still want to reconnect it as it keeps your amplifier cool while in use. Reconnecting is fairly straightforward - all fans have 2 or 3 wires that connect to corresponding terminals on the amp. Just make sure you don't mix up which wire is positive and negative, and make sure they are connected firmly and securely.

I don't know if you will see this or not, your post was 2 years ago. I have the same problem. My volume is stuck at 24. I have tried soft-reset........among other things. One thread says to turn volume down to 00 then press for 10 seconds. I have no control over the volume, so, yeah, thanks for that fix. I found that I could get the volume down by unplugging it,plugging it back in and sometimes the volume would pop up and I could turn it down one notch. I did it till I got to 00.............thought AHA! My problem is solved! No such luck. When I press the volume at 00 and try to hold it for 10 seconds, after 3-5 seconds it just pops back to the station frequency. I also thought that if I could get into the guts and spray the volume control with tuner-cleaner, it might help. No go.......after taking off the cover, I found a bunch of REALLY delicate looking electrical tapes and wires..........I was scared I would destroy something in an attempt to reach the volume control. I hate to trash this radio, the sound is awesome...............great design on the speaker, NASTY design on the controls. I'd be VERY interested to know if anyone, anywhere, has found a fix for this. I think maybe my next step will be hitting it with a hammer.

Try contact cleaner.

You can try contact cleaner. Spray some in (with unit turned OFF) and move the knob up and down several times stop to stop. then try to see if it helped.

sounds like you need to take it in to have it looked at. no simple fix unless you are an appliance technician. hard to walk a beginner through. i suggest calling an stereo repair guy.

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You need to be a bit clearer on the exact nature of the issue.
Please include if the unit was working and suddenly stopped producing sound (ie - speaker output fuse blew) or if you relocated the unit, and after hooking it back up, you aren't getting any sound (ie - not hooked up right) or if the volume knob isn't changing the readout for the volume level (logic or knob broken) - and also include the make and model of WHAT the volume knob is attached to (ie - Yamaha receiver model X)

Although I can't check this fix works for 1 month, a really simple explanation and fix was offered.

The rotary knob/control has 2 contacts, which when the knob is rotated c/w or anti-c/w it generates a pulse. The diagnosis is that as the remote still works, the PCB & volume circuit is fine. What is likely is that the 2 contacts/switches have become dirty or clogged.

SUGGESTED FIX: Take head unit faceplate apart to access PCB & rear of rotary control (4 screws). Spray WD40 into rear of volume control and rotate liberally to clean contacts. Dry of with lint free cloth, tissue or air dry.

I am confident this will work and the volume control will function again.

Have you checked the fuses. Usually under the dash or in the glove box.

I have the same unit, your unit sounds like its defected. Mine on the other hand has a static noise coming from its speakers, does yours do that too?