New design of Thetford N3000/4000 control board

[Colin McCourt]

In the latest design of this board Thetford have now dispensed with the 25A blade fuse, which melts instead of blowing, and have a 25A fuse soldered onto the board. I presume that their thinking is that the joint between the blade fuse and its holder is going high impedance and creating heat, thus melting the fuse. I have attached a picture of an old failed board and the latest design.

 

[Fat Albert]

Your old board with the melted 25 amp fuse looks identical to my replacement board complete with 25 amp blade fuse. This was a replacement that I had to purchase because the dealer informed me that the warranty was 3 months out. And he didn't speak to Thetford about the problem or I might have received a freebee. Has the new board got a different part number? My original 20A fuse board was 691101 and the replacement 25A is 692247 and fitted May 23. I did a little modification to my new board by removing the 25A fuse and having it in an external fuse holder and cabled back to the board. If I need to check or change the fuse, no need to remove the board.

 

[Colin McCourt]

Your old board with the melted 25 amp fuse looks identical to my replacement board complete with 25 amp blade fuse. This was a replacement that I had to purchase because the dealer informed me that the warranty was 3 months out. And he didn't speak to Thetford about the problem or I might have received a freebee. Has the new board got a different part number? My original 20A fuse board was 691101 and the replacement 25A is 692247 and fitted May 23. I did a little modification to my new board by removing the 25A fuse and having it in an external fuse holder and cabled back to the board. If I need to check or change the fuse, no need to remove the board.

They have kept the same part number by the looks of it.