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Lennox/Dunkirk Q90-100 failing to start
I have a Lennox/Dunkirk Q90-100 gas boiler that sometimes will not start. The control board will start the process and the induction motor will start to rev but will just die and then will try again. This goes on and on with a clicking sound coming from the control board, much like a telegraph key typing. I though it was the board and replaced it but that did not correct the problem. This unit was installed in 2006 to replace a Lennox complete heat system. Since then it has had a heat exchanger, igniter, 2 control boards and high limit switch replaced. If I power it down and let it set for 15 minutes or so it will start up and run fine sometimes for days with no problems other times it will only go a few cycles until the clicking returns. If you leave it alone while it is clicking it may do that for 5 minute to 3 hours and It will start by itself. Any thoughts on what may be causing this?