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Rinnai R50LS- water doesn't heat, even though there is good flow.

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Posted on Jan 02, 2017

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SOURCE: Rinnai R50LS- water doesn't heat, even though there is good flow.

If it's a new install: the water is going backwards through the heater and you need to check that your cold water IN is actually hooked up to the cold water IN spot on the heater. they don't register flow if the flow goes backwards through the heater.
If it's not a new install: something is stuck in your flow sensor, drain the unit and take it out to check.

Posted on Apr 28, 2011

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You need to check the water pressure and flow through the unit. It sounds like you dont have enough flow so it is shutting off.

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No hot water from kitchen tap


The hot side of the faucet is most likely plugged with something that came up thru the water system. The average thankless waterheater requires at least 1/2 to 3/4 gpm flow rate for the unit to sense flow and turn on. If there is not enough flow it will not fire and heat the water. Not sure about this particular unit but a few require at least one full gallon per minute flow. So chances are that if you fix the faucet, you fix the hot water issue at the same time

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My Rinnai is only 3 years old and just recently it has been running out of hot water for 10 to 15 minutes long intervals. We have well water and I am wondering if that has something to do with it. Kind of...


The Rinnai relys on good water flow to fire it up. In saying that it runs out of water; thats actually not possible. The Rinnai just heats up water as it goes. Usually faults for installs on bore or well water is a problem with water flow. Causes are blocked filters or your water pump from the bore starting to fail. I would expect you to have a large filter somewhere on the water line from the well. Try and find it and clean it out. The Rinnai also has a filter. Its like a plastic round shaped nut just under the heater on the middle connection. Turn the water off first, it should almost unscrew by hand, take it out and clean it (make sure you don't drop the O ring on it). Also some tapware have water filters right in the end of the spout, check these too. After you tried all this focus on the pump. Make sure no ther water is flowing, try the hot tap and see if it works. Do the same but slowly turn on a cold tap, slowly increasing the flow. Have someone out by the heater and see if the heater shuts down at any point. If it does it could be the water pump at fault. From what you have told me and I am certain water flow is the culprit here. Really focus on anything that might lessen the flow before you start messing with the heater. Best of luck.

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Usually this type of fault is down to poor water flow. Basically you are asking the unit to work at a level below it's minimum output. Easy thing to try is to check any filters or water flow limiters in your tapware. Usually these are in the nozzle of the tap. I often take these out. The inifinty reduces water flow anyway and there is no reason to have water limiters. Try turning on two taps at once. If this stops the fault then you definately need to increase your water flow. Make sure the mains water is turned on full. Aslo you can check the cold water filter on the infinity. It's just above the cold water isolation tap (middle pipe as you look at it), turn that off first, the filter is a round plastic nut, unscreww it and clean the filter. Reconnect, turn you mains water back on.
There are other faults but this is by far the most common.

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Rinnai R50LSi water heater- Water doesn't heat.


Flow meters can get jammed by silt or debrise. The only way that I know to check this problem it to remove & inspect the part and that takes alot of training if you have a Rinnai (not recommended for the beginner).

One thing you could check is the inlet screen. Turn off the water and power to the unit and drain down. The screen in the black plastic circle on the inlet fitting under the unit. Unscrew this and check how much grit it has collected. Clean off, replace, turn water back on, open a hot faucet to get the air out then turn the power back on. This sometimes improves the flow enough to solve the problem.

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1 Answer

Rinnai R50LS- water doesn't heat, even though there is good flow.


If it's a new install: the water is going backwards through the heater and you need to check that your cold water IN is actually hooked up to the cold water IN spot on the heater. they don't register flow if the flow goes backwards through the heater.
If it's not a new install: something is stuck in your flow sensor, drain the unit and take it out to check.

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I have a Rinnai model 2532 Tankless Water heater. When the Bath water is turned on (which is the largest water flow for the water heater)it makes a loud vibrating sound that can be heard through the entire...


We had the same problem - the hot water would only be hot for 3 -5 minutes and shut off, then we had to turn the water off, wait a few minutes, and do it again. VERY FRUSTRATING.

Soution: The Rinnai serviceman showed me the heat-exchanger blower/fan: It was clogged with dust and moths.

Another clue: Our Rinnai was extremely noisy when the heat came on. After the fan was cleaned and replaced, it is nearly silent.

If you are reasonably mechanically inclined:
TURN THE BREAKER / POWER OFF to the unit.

The blower-fan is located in the lower central area of the unit (at least on our unit). If you draw imaginary north-south, east-west lines through the center of the unit, the fan is in the lower-left quadrant. There is a spring clamp securing the black rubber accordian-like tube to the fan. There are two screws that secure the fan to the unit. there are two plugs that connect to the fan, as well as a third air-flow sensor that should be removed. then you can look at the fan unit, as well as the grill on the underside of the heat-exchanger that should be cleaned.

My thought was to go out and get a simple bug-screen, and place it over the air-input outlet vent going outside, but the repair guy said that although it may sound good, if that screen ever gets clogged, or reduces airflow to the Rinnai, then the unit will work harder, or even shut off, giving the same problem. Also - the Rinnai pipe going outside is a pipe within a pipe - so its both inlet and outlet air.

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you can get it off the rinnai web site they have a spot on there to get the internet manuel,, but from what you are saying you may need to adjust the thermostat, or the temp, remember even though you will have endless hot water it still takes the smae amount of timed for the hot water to get to your faucet,, not only that make sure your shower heads aren't holding back to much water pressure, if you don't have enough water going thru the unit it will not stay lit, if will come on and go off, judt to dstisfy the unit,, make sure the filter is clear, on the cold side there is a cap screw if you take it off there is a screen in side you just pull it out and clean it and reinstal it,,

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thats because the rinnai does not have a set up for a circulating pump it would make the unit run all the time,, they are not designed to work that way,, you will have to just wait for the hot water to get to the faucet just like before,,don't let any one tell you there is a way once the water flows it turn on the tankless so it would never shut off, you could get on that goes on a timer on say the farthest fauset away from the unit and set the timer to come on like 2 min before you are ready to use the water in that bathroom in the morning or at night other then that there is nothing else you can do

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We had the same problem - the hot water would only be hot for 3 -5 minutes and shut off, then we had to turn the water off, wait a few minutes, and do it again. VERY FRUSTRATING.

Solution: The Rinnai serviceman showed me the heat-exchanger blower/fan: It was clogged with dust and moths.

Another clue: Our Rinnai was extremely noisy when the heat came on. After the fan was cleaned and replaced, it is nearly silent.

If you are reasonably machanically inclined:
TURN THE BREAKER / POWER OFF to the unit.

The blower-fan is located in the lower central area of the unit (at least on our unit). If you draw imaginary north-south, east-west lines through the center of the unit, the fan is in the lower-left quadrant. There is a spring clamp securing the black rubber accordian-like tube to the fan. There are two screws that secure the fan to the unit. there are two plugs that connect to the fan, as well as a third air-flow sensor that should be removed. then you can look at the fan unit, as well as the grill on the underside of the heat-exchanger that should be cleaned.

My thought was to go out and get a simple bug-screen, and place it over the air-input outlet vent going outside, but the repair guy said that although it may sound good, if that screen ever gets clogged, or reduces airflow to the Rinnai, then the unit will work harder, or even shut off, giving the same problem,

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