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"MAF":3lkm33ja wrote: I think the cooling LED flashes on/off for this 3 mins, and then remains on once the cooling is switched on.[/quote:3lkm33ja]
You could be right. I don't use an ATC, instead I have its smaller cousin, the STC-1000.

"Will_D":27zr7bpe wrote: The instructions that came with my ATC-800+ show the following connections:

1,2 Cooling circuit
3,4 Heating circuit
5,6 The sensor
7,8 Mains in

There is no 9th terminal!!

Make sure you have an ATC-800+ as maybe the older 800 model might be different

Also remember that the heating and cooling circuits are just relay contacts to switch the live power. That means you would connect the live feed to terminal 7 and link it to terminals 1,3.

Then terminal 2 would be the switched live feed to the fridge and terminal 4 to the heater.

Hope this helps

Will[/quote:27zr7bpe]

I have the older ATC 800, it has a dead 5th terminal for some reason. I followed the wiring directions from the PDF I got online and all worked fine - the only extra thing I did was to create an earth bypass, so I have the whole thing earthed (my freezer is very old - all metal)

My seal isnt great - but thats a different story- I am getting some draught excluders and going to fit them up Saturday. When its all done I will post a few pics.

Thanks for the help

James