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DE means dead end. it means you are hitting the pressure cut off point. So that needs upping. Have you changed any pipe work, any fittings, is it colder yesterday than today, any leaks, anything changed in the loop.
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Cleaning spot are fantastic for that! Will have a look to see if i can find mine, The ones i have got are from a varistream.Not changed a thing since getting the system, seems ok today which is damned annoying, think its a wiring issue, didnae get any instructions about controller so im emailing cleaning spot to get some cheers Damo