Probably module failure. We stock these at £39.90+vat plus postage of £5+vat. The WD12S (that's an S on the end, not a 5) uses a mk1 or mk3 module. The mk1 has Ariston FE written on it - the mk3 has FULL0028 on it. Both same price - you can order here www.emwelec.co.uk
EMW, March 2010