Question about Rinnai Water Heaters

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Rinnai v1200 no water at all from hot taps. any ideas or common faults?

I've gas and water pressure to the unit. no water from unit. could it be water flow control device fault or water flow sensor fault? or something else? any ideas?

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Check for lyme buildup in the pipes also check for a stuck water shutoff valve.

Good luck,

Marty

Posted on May 13, 2014

  • wa2yyx May 21, 2014

    Having a water softener all but eliminates the build up of lyme deposits. Depending on how hard your water supply is then if it is hard the more lyme deposits will form and clog your pipes with lyme. Take a look and see if you can see any chalky white deposits. If so then you need to have a good quality water softener installed. Just remember that water softeners also need service mainly filling the brine container with saly crystals. Good luck,

  • wa2yyx May 21, 2014

    Having a water softener all but eliminates the build up of lyme deposits. Depending on how hard your water supply is then if it is hard the more lyme deposits will form and clog your pipes with lyme. Take a look and see if you can see any chalky white deposits. If so then you need to have a good quality water softener installed. Just remember that water softeners also need service mainly filling the brine container with saly crystals. Good luck,

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Its A Possibility The Left Over Water In The Hot Is Frozen. If Your Line Is Exposed Outside Somewhere It Can Easily Freeze Up. Turn On The Hot Water Everywhere In The House And If Accessible Check The Lines To See Where The Warmth Ends. You Can Leave One Off Over Night In Hopes That It Will Eventually Defrost.

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If you aren't getting any error codes, then the heater is probably doing its job. Your problem is probably somewhere in your plumbing system. The most common reason you get this sort of problem is due to cold water mixing in the hot water system. There are a number of causes for a "cross connection" :

-Faulty check valve
-Missing check valve on reciculation return line
-Faulty shower cartridge
-Thermostatic mixing valve set too low
-Faulty thermostatic mixing valve
-Faulty anti-scald valve

The easiest way to confirm a cross connection is to: 1) shutoff the cold water entering the tankless heater 2) open hot water valves around the house. If you still have water flowing at your hot water fixtures, then you have a cross connection.

Posted on Aug 01, 2010

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