Just tried it again, thin layer of soft ice/slush on front and rear screens. Started her up, book symbol on,and hit prog. No increase in fan speed, both front and rear switch lamps came on, prog displayed on the screen, fan direction lamp to windscreen came on. Evidence of rear screen heater working within 30 secs, nowt on the front. Left it 5 minutes, still no hfw or higher fan speed so turned prog off.
Thought I had my assistant today to help check things but she's been called into work.After I had dropped her off
I did notice one thing though. The A/C button lamp was off so ac was on, being tall I can't see that lamp without leaning over and down.
Could that being on stop the hfw working? Can't see that but you never know
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I also pressed prog again and the fan speed went to high straight away.