بسم الله الرحمن الرحيم
(Fatwa: 888/691/D=1434)
Fast shall break if water enters in the throat via nose while performing wudhu. You will have to make its qaza. It is so mentioned in Imdad al-Fatawa Vol. 2, p. 129.
Allah knows Best!
Darul Ifta,
Darul Uloom Deoband
