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I have a 4 year old Rinnai, recently it has been making a surging…

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I have a 4 year...
I have a 4 year old Rinnai, recently it has been making a surging type noise every few minutes when not in use. What would cause this?
Submitted: 3 years ago.Category: Plumbing
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Answered in 30 minutes by:
6/27/2015
Plumber: Rick, Construction Supervisor replied 3 years ago
Rick
Rick, Construction Supervisor
Category: Plumbing
Satisfied Customers: 24,593
Experience: Licensed Master plumber with 40+ yrs. experience.
Verified
I really can't diagnose a condition from here based on a vague description of a sound. I need a lot more info. What is your concern?
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