No Kitchen Hot Water

After we changed kitchen sink with new water, we no longer have hot water, can someone help me please?

Skoope said:

with new water

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I don't understand. What does your plumber say?

The plumber is saying it might be an issue to do with the tap, but I don't understand how a tap could create such problem

Is there any water coming from the hot tap or if it's a mixer when it's in the hot position ?

Is the house a bungalow ?

Some ceramic taps won't operate properly if the water pressure is too low.

Presumably you are getting hot water from other taps.

There's only cold water coming through the hot tap

No it's a detached 1 Story.

And I also checked the water pressure and high enough.

Not hot water on other taps either

A few possibilities

Hot water valve not turned back on.
Air lock in the hot water pipes.
Something else has entered a hot pipe and is blocking water flow.

The plumber should be investigating what the problem is.

As you have no hot water from other taps it's no an issue with your new kitchen tap.

p.s. Is there cold water flowing from the other hot taps or is there no water coming from them

If you have cold water flowing from the other hot taps, there is a problem with the water heating system.

Immersion turned off
Valve or switch from boiler turned off.