Also check the firmware as I believe there is a max temp settings.
Set it something higher than 230 say about 250-255
As it provides safety if the hot-temp goes into a fault condition and keeps heating
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Printer: Ormerod 2 (528.4) Duel extruder set-up with Aluminium X-Rib, RRPro Firmware v1.11-ch (2016-04-08)