No, not as long as the ball goes over the net and falls in the correct part of the court. You can have as many lets (essentially uncounted serves) as you want, although it is extremely rare to have more than one per service.
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No. A let is a service that touches the net but lands in the correct service box. Whenever a player serves a let, that player is allowed to serve over without penalty. It is essentially an uncounted serve. If a let occurs on the first serve, the player will not lose a point if they then fault; if a let occurs on the second serve (following a fault), it does not produce a double fault and a point for the opponent.
It is rare, but possible, to have more than one let on a single service.
A let occurs when a serve hits the netcord but lands into the correct designated square. A let entitles the server to redo the serve without penalty. A fault is any serve that does not land in the square.
No. A player can serve any number of let services in a point and they are always treated as voids and not as faults.