the c-550 does have a gap between the sensor and the base of the insert. is your fireplace on an outside wall by chance? if so when ever you do a cold start up you will have a longer wait till the fan kicks on. that huge amount of masonary that your insert is installed into is a giant heat sink! if you are using the insert continuously your fan will come on sooner because the masonary is preheated then.Jaugust124 said:dtbmcc,
Glad things are working out for you. Funny, I find myself with a fan problem as well. My fans were turning on when the temp. got to about 450 degrees. Tonight, the temp. went up to around 600 and no fan. Don't know what that's all about. I'm planning to have a few more fires and see what happens before I make the call to get service. I can always flip them on manually, but I want a system to work the way it was intended. Go figure.