When I turn on the bathtub faucet in my guest bedroom, no water comes out not a drop. Not even a hiss of air, same for the showerhead. What could be the cause of this?

Brand? Single handle? Any plumbing work done recently?

Did it ever worked before ? Any work done on the house in recently? What type / brand of faucet is it ? Can you post a photo of that faucet?

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Milo