In article ,
"Mungo \"two sheds\" Toadfoot" writes:

Lump of ice just slightly above the (flattened) V-shaped drainage channel?

Why? Feck knows. Sorry.

If that happens, I guess the channel is blocked, so the water
which sits in it right under the evaporator is likely to freeze.
f you remove the ice, can you actually pour water into the
channel and have it run away? (only test with a small amount;-)

--
Andrew Gabriel