Try holding start & on/off button for 12 seconds. If that does not work, you will need to replace your main module. We stock them, ready programmed for your model number at £65.88 inc postage (exchange). To order go to our site at www.emwelec.co.uk and put WF620 in the search box or call us on 0115 9652118. Tony EMW Electronics
www.emwelec.co.uk, April 2012
