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• Posted in thread: switching transformer hum normal? on 12-17-2010 at 09:30 PM
  Thanks. since I have two db levels of hum I would say one is abnormal.I am assuming you are
  saying these can go a long time with a loud hum and still work.Still it is annoying to hear it
  through the f...

• Posted in thread: Hi on 12-17-2010 at 08:25 PM
  My name is Mark from NJ and I am a DYIer. I just posted a question in the HVAC section had hope
  to find help from those who know.

• Posted in thread: switching transformer hum normal? on 12-17-2010 at 08:23 PM
  I have an older furnance with a Honeywell RA 89a 1074 switching transformer that has a loud hum
  at times at other times a low humWhen I hear the loud hum the system still works and if I turn
  off the p...