Pentair Master Temp 250 Loud deep rumbling sound like the \”normal\” exhaust sound sound times 10! 6 years old Cave Creek AZ. Started a few days ago and is not going away. I have opened the front cover and see no obstructions or loose partes etc etc
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How old is the heater? The blower/motor could be the issue as they can wear out, and begin to make noise. You may need to dig in deeper and see how the ventilation/blower is looking.
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