Water gets in his nose when he washes his face during wudoo’

Firstly: 

There is nothing wrong with you expelling the water that gets
into your nose when you wash your face, after you have finished rinsing your
mouth and nose. This is not regarded as something extra in addition to the
three times that are mentioned in the Sunnah, because you did not
deliberately make the water get into your nose. The scholars (may Allaah
have mercy on them) have stated that it is better when washing the face to
start at the top, so perhaps if you do that, no water will get into your
nose. 

Al-Nawawi (may Allaah have mercy on him) said:  

Al-Maawardi said: The mustahabb manner of washing the face is
to take the water in both hands, because that is more effective in making
the water reach the whole face etc, and to start with the top of the face
and move downwards, because the Messenger of Allaah (peace and
blessings of Allaah be upon him) used to do that, and because the top of the
face is more noble, as it is the place of prostration, and it is more
effective as the water naturally runs downwards. Then he should pass his wet
hands over his entire face so that he can make sure that the water reaches
all the parts it is supposed to. But if he makes the water reach all parts
of his face by any other method, that is sufficient. End quote. 

It also says in Mawaahib al-Jaleel (1/187), describing
the manner of washing the face: He should start at the top. 

Secondly: 

The Sunnah indicates that one should snuff water up into the
nose and expel it three times, as al-Bukhaari (186) and Muslim (235)
narrated from ‘Abd-Allaah ibn Zayd that he demonstrated for them the wudoo’
of the Prophet (peace and blessings of Allaah be upon him): He rinsed
his mouth and nose using one handful (of water), and he did that three
times.  

This hadeeth indicates that the Sunnah is not to separate the
rinsing of the mouth and nose, and to rinse both the mouth and nose from a
single handful of water, then rinse the mouth and nose from a single
handful, then rinse the mouth and nose from a single mouthful. This is
unlike what many people do by separating them; they rinse the mouth three
times then they rinse the nose three times.  

Al-Nawawi (may Allaah have mercy on him) said in Sharh
Muslim: 

Our companions said: However the water reaches the mouth and
nose, this fulfils the aim of rinsing them. As to which way is better, there
are five opinions, the first of which is that the mouth and nose should be
rinsed with three handfuls of water, rinsing the mouth and then the nose
each time… this method is the correct one, and is described in saheeh
ahaadeeth in al-Bukhaari, Muslim and elsewhere. As for the hadeeth which
indicates separating the two (actions), it is da’eef (weak). This leaves us
with one correct way, of washing both the mouth and nose together with three
handfuls, as we have indicated, because of the hadeeth of ‘Abd-Allaah ibn
Zayd which is quoted in the book. End quote. 

Rinsing them more than three times is makrooh. The evidence
for that is the report narrated by al-Nasaa’i (140), Abu Dawood (135) and
Ibn Maajah (422) from ‘Amr ibn Shu’ayb from his father from his grandfather,
who said: a Bedouin came to the Prophet (peace and blessings of Allaah
be upon him)and asked him about wudoo’. He showed him how to do it washing
each part of the body three times. Then he said: “This is wudoo’, and
whoever does more than this has transgressed the limits and wronged
himself.” 

This hadeeth was classed as saheeh by al-Albaani in Saheeh
al-Nasaa’i. 

Al-Nawawi (may Allaah have mercy on him) said: 

The scholars are unanimously agreed that it is makrooh to do
that more than three times. What is meant is washing that part of the body
thoroughly three times, but if on one of the times the part is not washed
thoroughly and the washing has to be repeated, then those two times will
count as one.  

If a person is uncertain as to whether he was washed two or
three times, he should regard it as two and do it a third time. This is the
correct view, as stated by the majority of our companions. Shaykh Abu
Muhammad al-Juwayni, one of our companions, said: He should do that three
times and no more than that, lest he commit an act of bid’ah by doing it
four times. The fourth is bid’ah and is makrooh if he does it deliberately,
and Allaah knows best. 

The point is that there is no sin on you if you expel water
that gets into your nose by mistake, and this is not regarded as doing
something extra in wudoo’, because you are not doing it deliberately. 

And Allaah knows best.