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Mike G.
Mike G., Master Electrician
Category: Plumbing
Satisfied Customers: 7589
Experience:  Proven Professional 48 years Experience
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I have a Rinnai R53 tankless water heater, 7 years old.

Customer Question

I have a Rinnai R53 tankless water heater, 7 years old. While taking a shower, it quit. I pulled the cover and found the two 3amp fuses blown. Turned off power, replaced fuses, turned on power and both fuses blew again. Where do I start looking?
Submitted: 1 year ago.
Category: Plumbing
Expert:  ProGrade replied 1 year ago.

Hi Jack, welcome to

Check the transformer and gas valve for short circuit with a multimeter. The primary & secondary of the transformer should be tested.

Customer: replied 1 year ago.
Unplugged the secondary from the circuit board, powered up unit (primary still plugged in) plugged in secondary and fuses immediately blew. Blown transformer?
Customer: replied 1 year ago.
What are the primary and secondary voltages of the power transformer for a Rinnai R 53 tankless water heater
Expert:  ProGrade replied 1 year ago.

Jack, my apologies for the site issue that prevented me from replying to your question.

Expert:  Derek Williams replied 1 year ago.

Hello my name is***** to just answer. Let me try to help if i can. I hate to say this, but this is a common problem with toilet cleaner tablets. What you will need to do is get a toilet auger. from home depot or lowe's and auger the obstruction out of the bowl. you want to get the regular and not the drop head version, since the opening in the bowl is narrow. this should get it out for you.

Expert:  Mike G. replied 1 year ago.

Hi, I'm Mike G and I'll be assisting you. Unfortunately you'll need to replace the PCBoard. It shorted out and there isn't anything other you can do. There is a troubleshooting guide online and that is their direction. Google your model number for the guide.