I shoved a digital thermometer under the jubilee clip and into the hose, At 80 ish the stat opened, and the guage was just above the lower 'mystery mark'.
So I guess the high 'mystery' mark is about 100 ish, which makes sense. If it gets up there switch off and phone breakdown!
I think the centre of the range on the guage, 80 90 100 has been electronically expanded, therefore not linear, after all that's the bit that matters.???
It caught me out, changed the stat for no reason,
Last edited by seadart; 04-11-10 at 13:55.