Carver water heater leaking badly.

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Hi all,

My father has a problem with a water leak on his Carver water heater in a second hand caravan he recently bought.

He is on the first outing in it this season and all was fine until this morning when he discovered that the water was flowing heavily outside the side of the fan.

Also there is a loud ticking noise coming from the heater area when the mains power is swtched on.

He removed the outside cover to see were the leak was coming from and it appears to be coming from a small hexaganle screw.

I have attached a few photos to show the area from which the leak is coming.

Any help or assistance would be greatly appreciated.

Thanks.