06:11PM | 12/16/04
Member Since: 12/15/04
7 lifetime posts
Model: BGU07512A

Serial #: 971241375


07:01PM | 12/16/04
Member Since: 12/15/04
7 lifetime posts
Is it possible that the one on the wall is the LS and the elbow the referred to ROS? I'm basing this question on the wiring diagram on the unit that shows 3 ROS switches and 1 LS. It looks like this:


The wire to (LS) is red and comes off Pin 3 on the 12 pin connector and the one from the last (ROS) is red going to Pin 8 (original board).


06:31AM | 12/17/04
Member Since: 12/16/04
54 lifetime posts
sounds to me like the brown plate on the cabinet wall you describe is the high limit switch, this as an automatically resetting internal temperature switch. It is sensing the combustion chamber temperature. It must be wired in series with all of the other limit swithces. The switch you mention on the elbow may be a flue exhaust limit switch, senses the flue gas temeprature.


11:09AM | 12/17/04
Member Since: 12/15/04
7 lifetime posts
Thanks for all the help. Have heat and no destruction other than a few skinned places. Really appreciate all the patience and info. Merry Christmas and a Happy New Year!
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