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Check the fluid level and be sure it isn't low. If that checks out o.k. then the racking valve is probably at fault. That controls the tracking on each side. Not the kind of thing most owners can change out, so you may need to call in a mobile tech or take it into a shop for that. Not too expensive to repair, but messy. Hope that proves helpful here. Please get back to me if you need more as all follow ups are included in our fee.
It can be called several things............it is on the slide room usually and especially if this is an HWH system. It is between the cylinders. Not advisable to do this yourself. These lines are under high pressure and can do some serious damage to you if you aren't careful.