Help with Rheem gas water heater error codes

Help with Rheem gas water heater error codes

by Ramon
(Arizona)

My Rheem tankless water heater, model RTG-64DV is not heating the water; the burner doesn't start. Every time when I plan to use hot water for shaving, my Rheem tankless is not working, it shows the error code 15. When I am taking a shower no problems at all.

What is going on?

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Jan 29, 2013
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Rheem 27
by: MKH

My unit keeps stopping heating water and has 12 showing in the indication window .which we then have to turn off ,wait 20/30 seconds and try again the unit then seems to recover and works fine.

This type of system works well apart from the draw of time waiting for hot water if you have any way to reduce the waste would like to hear .
The unit is 8 months old.

So before a call out thought to find a answer.
Any ideas for these problem would be most helpful
MKH.

Mar 18, 2011
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Low water flow doesn't start tankless water heater burner
by: Anonymous

I agree with Pat. Either using gas or electric tankless water heater you will have the same problem unless you provide minimum water flow required.

Tankless water heater are designed with flow sensors to protect the heat exchanger from being burnt.

I have seen many cases where people have installed low flow shower heads or aerators... they simply do not allow enough volume of water to pass through the heater and activate the burner or heating element. Solution is to check and remove the flow restrictors from the faucets or turn the other hot water tap ON while shaving and increase the flow.

I would first measure the water flow at the fixture to see is that a really problem. Just put the bucket under the tap, turn the hot water on and measure how much hot water comes out in a minute.

Did you check sediment buildup, which will reduce the water flow also.

Or, you might have a problem when running several faucets at the same time and the pressure drops in the plumbing line that is using hot water. In this case pressure is not high enough to activate the switch in your Rheem tankless water heater.

Solution for low flow might also be to install a circulatory pump. Navien for example is one of the tankless manufacturers that includes a pump.

Jun 23, 2010
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rheem error codes
by: Pat

The error code 15 you are talking about is actually not an error. Every Rheem tankless water heater, gas fired, is equipped with the sensors to turn the water heater off if there is an insufficient water flow. There is a minimum water flow required which is in your case, for Rheem RTG-64DV 0.40 gpm.

Open the hot water faucet more to provide enough volume.

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