I have a client who's boiler shut down due to the cad cell not "seeing" the flame. The boiler was recently serviced 10-months ago: (1) is it common to check the cad cell as part of the annual boiler maintenance? and (2) is the failure of a cad cell relatively slow -- such that a check 10-months ago might have caught the problem and prevented the no-heat condition?
Thank you
jhc
Thank you
jhc