Not many people here in the USA have Fiestas with Heated Windscreens.
Did some research on that and it seems that FORD kinda' owned the market due to patent rights on the idea until 2011, so the concept of heated windows is not new (Ford Thunderbird and Mercury Cougar were some that used this) now many others are onto the bandwagon over this.
So if you're having trouble with your system, - has the (or any) window been repaired recently?
How about someone working in the car around the Console and radio?
You checked Fuses, but the wiring and Relays also need to be checked, which wiring is impossible because the wires to that conductive laminate sandwiched inside the glass, is buried into the console.
So if some damage has been done to the window - it can trigger the fuses to blow but if they have not - then the relays involved - since you've changed the console - are suspect - that means you have to more relays in the passenger compartment but they are under the dash. IN the USA they are behind the Glove box ON THE PASSENGER side - (right side) but considering UK - if you're driving on the Right - the LEFT side Glove box, behind it is where this fuse box might be.
Why two?
- (In reality there are several - just read the threads left behind on other similar electrical topics to explain other issues around the Fiesta's Electrical problems in other parts of this Forum)
Because the Engine compartment uses many fuses and relays for the PCM and TCM modules - but the Body Control Module is in the passenger compartment and has a separate feed to it from the Engine fuse box to handle the current and also provide more access to convenience features like Heated Seats, Windows and lighting effects. There is extra wiring needed that would make the harness from the engine side thru it's firewall into the passenger side - a bit too cumbersome to handle easily to the Body Control Module is located in the passenger part of the car, but it is located differently due to UK/AU and USA/World seating arrangements..
If possible there may be another heavy duty fuse located by the BATTERY under it's Red Cover - and it may be bolted as an auxiliary and if that blew, all power to the climate controls can be affected.
Look up Ford Transit Vans and heated windscreens - it may help you locate and fix this problem.
To add:
The wiring to the windshield heater element - is embedded in the pillar - so if you can remove the pillar trim, you can locate the harness and wire strip and clips that pushes the current thru the layer in the glass, to the other side.
So that means you'll have to take apart the pillars and part of the front console again to check and verify the wires are clipped onto the element strip and the strip itself is not torn.