You got me stumped. Heating the cylinder by the boiler, or the immersion, are two completely separate things, with no common parts. So the fact that neither are working is strange.
When you say "the immersion" I presume you are talking about the electric element in the hot water cylinder?
The only common ground for not getting hot water from either method, is that there is no water in the cylinder itself. When you say you are not getting hot water, I assume you are getting cold water from the hot tap, as opposed to no water at all?
Is that when the system is cold?pressure is at 1.5bar
Is that when the system is cold?
Is there any light on your immersion switch to indicate when it's on?
OK, here's what I'd do. I don't know the setup of your boiler/heating etc. so keep that in mind.
1. The immersion. Forget that for the moment. You say you have never used it, so it is possible it has never worked. It is an electric element going into the hot water tank and has no connection with the boiler/heating system. On the off-chance, check the fuzebox to see if hte tripswitch/mcb for the immersion is on. It will have a separate one. Also, as RedOnion asked, is there a red light to show it is on/has power.
2. Hot water via the boiler. As you have said, you have a separate circuit going into the boiler (a coil of pipe off the radiator circuit ) that is controlled by a motorised valve. The fact that the boiler operates when you turn on this valve via your Climote suggests that the motorized head unit (that rotates the valve in the pipe) is working. Normally those motorised valves get a signal from the climote, or whatever unit you use, and when they reach the end of their turn, a microswitch turns on the boiler. So the fact that the boiler turns on suggests that it is working.
On saying that, I'd locate it and make sure it actually is. It could be located in a hot press near the immersion etc. I'd actually check the piping by touch to make sure that the pipe going into the tank is getting hot, i.e. there is a flow of hot water from the boiler to the valve, and a flow of water from valve to the tank coil.
Once you've done those checks, let us know what you find.
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