Brought this from a neighbour in good working order about 2 years ago and never used it, it has been kept in the conservatory during that time and decided to sell it but when switched on it comes up with resistance 18 and unable to change it. I left it switched on the other day for about 15 mins and tried changing settings and low and behold it all worked perfectly for about 10 mins and then suddenly reverted back to resistance 18 so sadly having to sell as spares or repair. Pick up only from Andover in Hampshire and Thanks for looking.