Question about RTO Takagi TM-1-N Mobius Tankless Water Heater - Natural Gas

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The unit stops supplying hot water after 10-15 min of use and then restarts again after 5 more minutes

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Diaphragm valve or micro switch best of luck

Posted on Nov 06, 2009

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Rinnai RL94i - Produces hot water for 3 minutes, then stops


I just had this exact problem. It kept getting worse until we had no water. Our Rinnai tankless hot water heater started the same way though, with hot water for a few minutes and then would shut off with an error code 10. We just had to shut the hot water off and then back on, wait a minute or so and we had hot water back for a few minutes. Our unit would come on with a loud vibrating noise and remain until it shut off with an error code 10 (air flow fault). The solution was to remove the blower fan and blow out the squirrel cage. Ours had moths in it. We also vacuumed out the fan housing. Be careful to mark any wires you disconnect and take pictures before removal. Our unit is now almost silent when it comes on and supplies endless hot water.
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Jun 10, 2014 | Rinnai RL94i Tankless Water Heater

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When I turn the water on its takes forever to get hot and then only stays hot for about 10 minutes. Then it gets freezing.


if the unit fire up and is hot at the point of the hot supply after 2-5 sec then there is no problem with the unit..it could be your plumbing.. usally you will get a code if there is a problem with the unit. if you do get a code note it and contact rheem..

Aug 11, 2010 | Rheem RTG-74PVN-2 Natural Gas Pronto Whole...

1 Answer

I have a problem with my Rinnai hot water heater giving me intermitant hot and cold. The water gets hot and I get in the shower. A few minutes later the hot water stops and I have to shut of the hot water...


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 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.

May 24, 2010 | Rinnai Webstone The isolator EXP tankless...

1 Answer

Need help


I would use the instant unit for a secondary unit to a large conventional heater, 40 gal min, gas or electric. They are both about the same now, but when the power goes out, you might not have the pump running, but you will have hot water! And whether it is a secondary or a primary water source, you will have a hot supply feeding it just in case. We have 2 people in the house, and a 30 gallon unit, and it is not big enough. The 40 gallon tank worked great. Hope this helps.

May 04, 2010 | Bosch & Tankless LP Hot Water Heater

1 Answer

We have a Rheem PowerVent, 36,000 water heater for nine yrs now. This is the 5th time we seem to have a problem. We only get about a 5 minute hot shower and it turns cold. Is this water heater a...


Is the water heater in a basement or an area thats cold? A water heater jacket may help.

If not ,try setting the heat up a little higher on it until you have more then a 5 min hot shower.

May pay you to get a 100 gallon heater.

Jan 06, 2010 | Rheem 50 Gallon FVR NATGAS Water Heater...

1 Answer

Rinnai XR 20 - water temperature varies hot - cold - hot etc during 4 to 5 min shower


your gas supply may be to low to keep the unit firing while you are showering...especially if you have other gas appliances running while you are using the unit.

If this is happening after someone else has recently used the unit....then it may be a problem that some call stacking. The unit works on flow....not sure about that unit but they usually take between 1/2 - 3/4 gallon to turn the burner on. If someone recently used it and then you get in the shower...you will get the hot that is already in the line but then it takes that initial amount to fire again, thus loading the pipe with cold water.....it then comes out on you followed by the hot that has finally entered the line. Once it is past that point there should be no issue, unless it it a gas problem like I mentioned.

Oct 24, 2009 | Rinnai Water Heaters

1 Answer

Tankless water heater: cold sandwich effect. While showering, hot water stops for about 1 min and then runs again. Was fine for 5 years.


tankless water heaters are a great appliance with one small draw back they require a constant flow of water through them to maintain production of hot water if the water presure fluctuates they can cut out momentarily or if your water supply is less than great ie hard ,high iron,
sulpher ect.. then the heat exchanger can become plugged over time like say 5 years. Contamination of the flow sensor/presure switch could also be a culprit depending on how handy you are a through cleaning with a good kettle descaler will probably help.
Good Luck

Oct 07, 2009 | Water Heaters

1 Answer

Heater stops heating water


you have to much volume of water going thru the unit, did you size it properly by haow many baths and showers you have or did you just by the cheapest one,, there is a scale to go by run just one shower and see if it changes temp, with nothing else running,, a shower has 2.5 to 4.5 gal per min,, then you can also check to make sure it has the right size gas line 3/4 from the meter to the unit is required at a min of 2lbs of gas

Jun 17, 2009 | Rheem Tankless Hot Water Heater...

1 Answer

No hot water out of a rtg-74pvp-1 tankless water heater


in order to reset the unit you will have to turn the temp all the way down then unplug the unit for 5 min,, remember it is a computer and it knows, after plugging in back in after the five min, reset the temp open up a fauset while doing this, that way it will be regestering the flow of water to set the temp by

Dec 18, 2008 | Rheem Tankless Hot Water Heater...

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