Thanks very much for the reply. I’ll try and take some photos tomorrow and upload. From reading other responses, there is usually a ‘Reset’ button on various Spa/Hot Tubs, doesn’t seem to be one on this model. It was strange as even with the ‘HL’ displayed - the bubbles, filter and heater were all working (bubbles working 100%, filter filtrating & the heater making a noise as normal when heating). It was working a couple of days ago, strange that it would stop working.