My story just might help someone with 3 way fridge trouble so here goes; We've had our motorhome 3 years now and the fridge was always ok even in Spain's high ambient temperatures, until suddenly about a year ago we were in Spain, temperatures were the usual high twenties and I noticed the fridge evaporator wasn't frosting at all, just felt cold with condensation on it and the beers were chilled, but not properly cold. I remembered the evaporator always used to ice up because I had to defrost it once a fortnight or so. The freezer seemed unaffected. I did all the usual checks, the heater was working, the current consumption tallied with 120w, I tried it on gas and it was marginally better but still didn't frost. The stat was OK (never actually switched off) The only thing left it could be was the absorption unit, so I took the fridge out and turned it upside down, put it all back in and... no different. Long story short, it was under warranty so the dealership swapped the actual absorption cooling unit for a brand new one last December. Seemed better on the way home, but come April when we went to Portugal, you've guessed it.. Exactly the same problem... I began to question my sanity. When we got home I decided to take the aluminium fins off inside to see if the actual evaporator pipework behind would frost, (ie in an unloaded state) I found the screws to be loose holding it on and the heat transfer paste was quite sparse and quite dried. The pipework behind frosted up great so I ordered some tubes of heat transfer paste on ebay, plastered it on and reassembled tightly. I must admit I didn't have any faith in it working any differently. But look! FROST! GLORIOUS FROST! just like I remembered it! So if you're having fridge (not freezer) trouble, check your paste.