Richard, sounds like main module failure (back of machine). We stock it ready programmed for £59.88 + £6 postage (exchange) and you can return it for a refund (less our £12 handling) if it does not cure the fault. To order, go to our site and put WF840 in the search box or call us on 0115 9652118 Tony EMW Electronics
www.emwelec.co.uk
March 2013