schreiber intergrated fridge/freezer working back to front?

I brought a schreiber intergrated fridge/freezer (model no APM 6855) for £10.00. It had been returned to the supplier because the thermostat had gone, so when i got it home i went on line to order a new thermostat, i was told i had to get a pcb which i did. When i recieved it, i fitted it carefully making sure each wire went to the right connection on the pcb,i then turned the fridge/freezer on i could hear the condenser working,with the light coming on in the fridge. Ok great no problem, fitted it into the housing and letf it running partly filled with food. Came down the next day to get some milk from the fridge and it was completly frozen. The freezer seems to be working ok, but the fridge is freezing as well. The display for the fridge reads H which according to the manual means the temperature is above +9, also when the doors are shut (does not matter for how long) the condenser is constantly running, as soon as you open the doors it stops. so for the moment i have turned it off. I have thought about getting a wiring diagram for the pcb even though i changed wires like for like. PLEASE HELP as my whole family is fed up with beans on toast.