Pool and Spa
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Welcome to Just Answer, my name is ***** ***** I will do my best to help you with your issue. If my initial response doesn’t answer your question then let me know and we can continue our conversation.You could have a bad draft pressure switch, the fan could be clogged or the vac tubing to the switch could be kinked, deteriorated or blocked. After you rule out all these (except the bad switch) you can try jumping the 2 leads on the switch after the fan starts up (not before). If the burner fires up you probably have a bad switch.
Yes. Sorry for the delayed response I had to step away for a few
You need to jump the switch leads like I mentioned before.
Based on your description if the burner fires up when you jump the switch leads there's a high probability you need to replace the switch
Did you jump them after the fan started up?
Ok, then you probably have a bad board given your description so far. I'd try power the unit down wait a few minutes then power it back up and jump the switch leads again after the fan starts up. If you still get a bD error then the board is a likely culprit
Before you replace the board check to be sure the FC4 fuse is good. Also check all your connections. I'm assuming this is an H series.
LO is limit string open. Check the limits for continuity and try resetting the rollout switches
Are you sure you've identified the draft switch? It sounds like you blew a fuse the last time. Jumping the switch after the fan starts shouldn't blow a fuse. If you're sure you need to try jumping the switch again
That looks like the switch. So try jumping it again
Check the switch connections at the board. If they're good it sounds like your ICB is acting up and is a likely culprit
You are sure you don't have a bad lead from the switch? I don't have anything else to offer you. I'm going to open this backup to my colleagues so one of them can help. Please don't respond (even to acknowledge this post)until you get a response from us. If you respond first it will only delay your answer.
It seems there was a glitch on our end. I'll repost to my colleagues.