burning smell from electric shower

I was wondering if anyone could give me some advice.
Normally my shower annoyingly alternates between hot and cold every minute or so but for the last few mornings when I have taken a shower the water has been extremely hot, and today a smell of burning plastic was coming from the shower control panel. I immediately turned of the shower at the red switch outside the bathroom. I have had to turn my water off over night for a while whilst I am waiting for repair work to be done, could this be the problem?
Does anyone have any suggestions on what to do (I am on a very tight budget).

Most likely a loose connection somewhere. V important that it is looked at as could cause fire. As you are on a budget, you could try isolating the shower circuit at the consumer unit and then removing the cover (On the shower). Look for any signs of overheating at the terminals. It would probably help if you could post a picture of said terminals if there is any damage visible to get advice. If you can't see any damage, it may be in the switch instead.

Best would be to get an electrician to look into it. They will have tools to check the continuity and insulation of the circuit better than a visual inspection.

ok thank you, I will get someone to have a look.