I have a Whitfiled Profile 20 Pellet stove. The ignitor is not heating up, and I believe that it has gone out. We have had this stove for about 6 years, and have not yet had to replace the ignitor in it. We were told they had a life span of about 2-3 years. MY question is, how hard is it to replace the ignitor, and is there and instruction manual available somewhere that would show me how to perform this replacement. Thanks in advance for any assistance you may be able to give me!!