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Is the boiler getting hot in the rear or not? Also take a look once you open up the outside inspection cover for any signs of yellowish debris around the burner or any sounds like an old percolator coffee pot. Those would be signs of cooling unit failure. Get back to me with what you observed and we can go from there. All follow ups are included in our fee.
Just checking back in to see if you may have missed my response to your question a few days ago? If you still need some assistance and input from me here, please get back to me. Thanks!