Rheem RTE13 Tankless 240v water heater problem

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  #1  
Old 01-28-18, 05:54 AM
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Rheem RTE13 Tankless 240v water heater problem

Its a 1.5 year old heater that heats correctly but won't stop!

Works correctly until you turn the faucet off. The 2 system active red indicator lights remain on until the internal breaker opens, what should I look towards as the problem?
 
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  #2  
Old 01-28-18, 09:50 AM
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Looks like there is a spring loaded plunger (3) inside the cold water inlet that activates a magnetic switch (4). It needs to be checked for mineral buildup. It needs to slide easily to signify water flow to the heater.

Servicing information.... rheem/FetchDocument.aspx/RTE_series
 
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Old 01-28-18, 11:25 AM
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I took that apart and it was clean.
 
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Old 01-28-18, 11:36 AM
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But does it slide easily inside the housing. That's how the heater knows to turn on. The water flow draws that piece in.... in the direction of the flow. When the water flow stops.... the spring pushes the slide back out.
 
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Old 02-04-18, 04:33 AM
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Yes, when I slide a metal screw driver in to where the plunger is, the plunger comes out with the screwdriver. I have noticed if I turn the heater on low and run it for about 20 seconds, it works fine and does not stay on active. If I heat the unit up by running water at a higher temperature or rate than I will have this issue.
 
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Old 02-04-18, 10:11 AM
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The troubleshooting manual I left is very easy to follow.

The key to that unit starting and stopping is that magnetic flow sensor. It could be checked with an ohmmeter with the AC power shut off. The meter would indicate one resistance with the water flowing and a different resistance with the water not flowing.
 
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Old 02-05-18, 03:53 PM
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No change in the resistance with water flowing or stationary so why would the indicators stay on?
 
  #8  
Old 02-05-18, 04:10 PM
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There needs to be a change. It sounds like the plunger is not returning to its normal off position and the heater thinks you are using water.
 
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