tons of debris removed. This type of problem is typically caused by low water flow. When you get INTO the shower and turn the handle to a comfortable temperature, you are lowering the demand for hot water and the unit shuts off. The flow is too low to keep it going. While a tankless hot water heater can supply one shower with endless hot water, the capacity is usually limited to just one faucet. Burner shuts off My Rinnai hot water heaters has worked fine for 6 years, but recently it comes on perfectly but shuts down to a code 12 shortly after use. Learn the proper way to flush and maintain a Rinnai Tankless Water Heater. Some manufacturers, such as Rinnai, have developed tankless water heaters hold onto the hot water supply for an additional 60 seconds. Install a tankless water heater that does not shut off when the tap is closed. If you heater shuts off during usage, here are a few things to check: Ensure your filter is clean and free of debris (instructions) My questions are as follows: 1. The point is to keep the hot flow rate high so the tankless unit doesn't shut off due to insufficient flow. No hot water is one of the most common problems in water heating systems. Tankless heaters are initiated by flow demand. Do a load of laundry while you’re taking a shower and a tankless heater will have a hard time producing enough hot water to supply both. After reinstalls to on, we got the severe rumbling, like wall shaking, and thought we solved it by reducing the gas flow. If this flow requirement is not met, the heater will not fire. We have a Rinnai R85 tankless water heater. Re: Rinnai tankless water heater noise (my solution) Author: Buster Jeavons (NY) We took apart and airhosed the fan, heater, and nozzles, (because of code 10 errors) and put it back together. Noritz tankless water heaters have a minimum flow requirement (0.5 gpm for most models.) If you are turning your shower handle to HOT when you start the shower, then there is enough flow to start the heater. Tankless water heater - one shower got cold. This list includes some of the more common problems that people have with tankless hot water heaters, but it is not all inclusive. Problem - every shower (no other hot water demand in the house) runs cold for 2-3mins, then hot, then varying heat (for about 3mins), then back to cold for 2-3min b … read more The gas pressure read a 9 but drops to 1.5 when the unit is heating water. Rinnai R75LS tankless water heater. Make sure that the shut-off valve, is not closed. Eccotemp Protection Plans are available for purchase within 60 days of your water heater purchase. We have a vacation home near Lake Tahoe, CA, and would like to turn the water off during long periods of our absence over the winter to save on heating. 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