Cider not starting?

[PJbrew]

Hi all

First time home brewer.

I have started three 20L fermenters of cider from apples i pressed myself. Used three different yeasts (Safcider AS-2, TF-6 and Mangrove Jack M02). Trying to follow as closely as possible Andrew Lea's book including sulphiting and yeats/yeast nutrient 24hours later. Initial temperature of the must was about 14 degrees C in my unheated cottage.

Only the batch with the AS-2 yeast has got going (bubbling and SG dropping). The other two show no activity after 2.5 weeks. Have warmed the temp up to low to mid 20 degrees C for the past week but still no action.

Looking for help, do i pitch another lot of yeast or is there something else potentially at play here?

Any help appreciated
Thanks

 

[cedric]

TF-6 temp range is 10°C - 30°C, so it should be ok
MO-2 temp range is 18°C - 24°C, so this should start now.
do you aerate usually?
they might need a quick one to start the yeast off, now the temp is better?