********* Disclaimer **********
Any installation and or wiring advice given in this is guidance only. Ultimately the responsibility for the correct and safe installation lies with the installer. If a domestic installation, Part P of the building regulations must be complied with, usually by ensuring that the wiring complies with IEEE wiring regulations.
********* Disclaimer **********
Lets check the wiring
Remove cable circled in red.
Wired (Heating Only)
Or Wired (Heating and Hot Water)
Is the heating still on? (Put the wire back after completing this test)