nute problem

I give my plants general hydroponics nutes "lucas formula" and I gave my plant nutes to long and some of the bottom buds the hairs are burnt. I think its nute burn but could it be something else? Iv been giving it plain ph balanced water the last three waterings and now the fan leaves are yellowing but the buds do not seem to be getting any better. Is there anything I can do to fix this? I can take pics if needed.

Good idea to flush the soil and try to get some of those nutes out of there.
The yellowing of the lower leaf may just be natural. If upper and middle fan leaves are green I wouldn't worry about it.

Its possible you have a lock out. flushing with fresh water will fix it most of the time but you may need a little help. google clearex or flora shield.