My loft fan and wall controller used to work fine, but it is over 15 yrs old now. I can turn the fan and light on/off using the switch on the wall controller, but the fan speed and the dimmer buttons do not work anymore. Once the switch is turned on, the light can be turned off/on using the chain but the fan is stuck on a medium speed (don’t have a separate chain for the fan). I don’t have a remote as they all died on me years ago and I got tired of replacing remotes that keep braking. I am wondering if I can just change out the wall controller or do I need to replace the receiver in the fan as well? I was hoping to not replace the receiver as it is a pain to change that out.