Ok, I'm getting this also, Poly is dry, I need to test the defrost element and drain heater to check their function the main defrost element seems to be 280w, does anyone know the rating of the drain heater or am I just going to hope the test equates to something that seems sensible.

I will be changing the stat anyhow as I'm not convinced this is functioning correctly (anyone know what type it is so as I can confirm)