Rental tractor  shows  TLPH on the screen  this morning.  
Won't move.
related?   

Moves now..  using  clutch  to start out, or  just   using the toggle.   
It's  a lot colder now than last week...  is there a  'lock out'  when  temps  are  low,  that  forces  a  warm up period?     



Also,  noticed the   scv  #3 and #4  (manual ones)  don't work either.    I've been using them  instead of the  joystick ones  on my  baler and  disc mower    just  because  i  didn't want to use the joystick. (figured there was  enough other  stuff to 'learn' on this new tractor  before i  changed  how i  ran  the  hydraulics) 

What does  TLPH  stand for?    temp low pressure hydraulics???    (wild swing here)   Tractor is  sitting under 8 inches of snow  at  20 degrees...