I too have a Peugeot 206 - and has given me nothing but grief - mostly electrical.
The fact you are suddenly losing systems, and draining battery points to a short in the wiring loom - which is a common fault on pugs.
I advise you trace the wire from the rear heater to the fusebox (it's labeled in there). Use a cheap multimeter - pull the fuse out and check the wiring both to the heater (resistance to good earth) and the supply( check for 12V )with the switch on. You may end up undoing the loom cover in the engine bay - but check your feet area first for any damaged wires. Try wiggling the loom with the ignition switch on and in neutral to find the problem. Often just taping it up properly solves it.
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Thanks for your advice Rickie. Will do as you suggest and fingers crossed I have a solution. Quite handly at fixing my car but bit stumped when it comes to the electrics.
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