I have a evcon furnace for my mobile home and we have trouble keeping it running
We have replaced the motor, ignitor and the limit switch It will blink 4 times which on the furnace means limit switch open. Please help

Limit faults usually mean the unit is overheating. Replacing the limit switch won't correct this. If the air filter(s) aren't clogged, you may need a pro to find and correct the problem.