Hot end doesn't reach the initial temperature

I'm new on this 3D printing area, I've having a lot of issues while ensambling my Prusa i3 Aluminiun with Sangui board, but now I have another issue, it seems that the hot end never reaches the initial temp, if I set it to 240 Celsius, it goes to 230 up to 235 but never reaches the 240, so I tried to decrease the initial temperature on the slicer to 230 and now it goes to 220 up to 225, I don't know what to do, I hope you can help me here.

Thanks in advace

Make sure to do a PID Tuning (M303 [reprap.org]) and then either modify your firmware or store the resulting PID values in the EEPROM.

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[www.bonkers.de]
[merlin-hotend.de]
[www.hackerspace-ffm.de]

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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Supporting 3D Printers with Parts and Build services.
Printer: Ormerod 2 (528.4) Duel extruder set-up with Aluminium X-Rib, RRPro Firmware v1.11-ch (2016-04-08)