My fry pump is not cooling right? last winter it was blowing cool nouns intead off warm ,...

last winter it was blowing cool nouns intead off warm , so I have someone look at it . They put a new board in.
Now I want cool air it works sometimes for a little while, than the red oil lamp on the Thermostat where it says check comes on
and thaw out air starts blowing.
Help?
Where would the filter for my oven be?
Answers:    Call the repair people subsidise out, could be one of several problems.
I enjoy a high-ranking pitch racket coming from...
sounds like a defrost problem have the repair populace check the defrost board and defrost thermostat
What is the best, easiest, and lowest possible...
We need more specific info on your prob. Could be a number of things...