Another update.... so yesterday my new fan arrived for my octagon 20, so I stuck a sweatshirt in the tumble dryer for 10 mins, then waited for it not to feel hot and went for the fan replacement.... Took the top off the incubator and dropped the sweat shirt over the top of the eggs. Wow how good is Brinsea parts. Under 10mins and fan replaced and back together (I am not a sales rep for Brinsea) However for a chicken lover who decided to hatch my own I couldn’t of asked for a better piece of kit. Also if it wasn’t for you guys then it would have been a different story. The reason I am so happy is I candled the eggs and after nearly 5 days of temp fluctuations 7 of the 9 have developed noticeably while 2 are still kind of and the other 3 look less promising but will wait until day 11 before I discard any. I can not thank you all enough for your great advice through this but as important was your words of encouragement and support. When it all went wrong with the incubator I was ready to give up but your advice made me persivere.
Still a way to go but thank you all.