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The Wall has a powerful search engine that will go all the way back to 2002. Use "quotation marks" around multiple-word searches. RIGHT-CLICK on the results and choose Open Link In New Window so you'll be able to get back to your results. Happy searching!
In fairness to all, we don't discuss pricing on the Wall. Thanks for your cooperation.
If you take a pair of needle nose pliers or tweezers you can disconnect the spring on top of the clapper and take a good look at the contacts. If they are pitted etc. time for new relay. I concur, check the amp draw on circulator, this usually does not happen out of the blue, could have been building up for some time.