Combining wudhu and tayammum in a single wudhu الجمع بين الوضوء والتيمم في وضوء واحد

Praise be to Allah, and may Allah’s peace and blessings be upon the Messenger of Allah, his family and his companions.

As to what follows:

In response to your question, we say, and with Allah Almighty lies all success:

The question of combining wudhu and tayammum in a single wudhu is the view of some people of knowledge. However, the correct view is that the two are not to be combined, and there is no evidence to support the combining of the two. As for the hadith which is relied on by those who are of the view of combining, then it is da`if (weak). What is correct is that if there is a part of the limb that is supposed to be washed in wudhu that cannot be washed, if it can be wiped over then this suffices washing and also suffices performing tayammum. However, if it cannot be washed nor wiped over, then the majority of scholars are of the view that tayammum suffices for it; while a group of the people of knowledge are of the view that tayammum does not suffice for it, rather one should settle with what he can wash of it and the rest would not be binding to wash, because there is no reason for tayammum in this scenario. This is the view held by a group of the people of knowledge. It is also the view held by the Dhahiri madh'hab and some jurists of other madh'habs, and is a view that has relevance and deserves contemplation.