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SmartBank error codes:

E 10 Communication has been lost with SmartBank. The RJ11 cable has probably been pulled out or damaged. With a SmartBank Advanced, split charging will cease to function. With a SmartBank Standard, split charging will continue to operate as usual, you just won’t know about it.

Note that error codes relating to SmartGauge begin with zero, those relating to SmartBank begin with 1.

Page 11 of the manual at http://www.smartgauge.co.uk/pdfs/manuals/sb_adv_r203.pdf