RV Repair: suburban fs25 furance

Question
the blower will come on for 20 seconds than quits  put new limit switch on  did not help told to put sail switch in but the furnace does not come out of cabinet  any ideas thanks

Answer
The furnace should come out if you would like to send pic I can help. I would bet that the igniter is probably dirty and not letting it light that's why it short cycles you will probably need to pull it to get it out. send me inside and outside pic so I can walk you thru it.