First check to see if your temp. dial is not set on vacation or pilot and set it to hot or very hot which you prefer and it should fire rite-up if not, call a plumber 'cos you have a bigger problem...lazgo
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please see the next step: he pilot light may be out or may not stay lit. There may not be enough
hot water, or the water may be too hot. The water heater may leak or be
noisy, or the hot water may be dirty. A problem with your water heater may be due to overwork, not mechanics.
If your water heater holds less than 15 gallons per family member (tank
volume is stamped on a metal plate affixed to most water heaters),
consider a larger unit or staggering your use of hot water. Drain a hot water tank:
Turn the gas-control knob to
off and close the gas-shutoff valve.
Close the cold-water supply valve and open a hot-water faucet in the house to speed draining.
Attach a garden hose to the drain valve and run it outside to a
drain. If the heater is in the basement you may need to run the hose to
or through a sump pump.
Open the drain valve and allow the tank to drain.
Once done, close the drain valve, open the cold-water supply valve,
and open any nearby hot-water faucet. When a steady stream of water
flows from that faucet, the tank is full; close the hot-water faucet.
Once the tank is full, turn on the gas and relight the pilot.
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 fault for installs on bore or well water is a problem with water flow. Causes are blockeed filters or you 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 our. The Rinnai also has a filter. It,s like a plastic round shaped nut just under the heater on the miidle 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 has water filter right in the end of the spout, check these too. After you tried all this focus on the pump. Make sure no ther water id 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 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.
chances are that you have a bad faucet that is drawing water from a cold water tap. You will need to have a helper turn on the hot water in that bathroom while you feel the pipes at the water heater and see if they are heating up. If they feel like there is no flow, the water is coming from somewhere and you will need to turn the shut-offs of at various sinks to target the problem faucet. If you find which cold water line is acting up, install a back-flow check valve so the water goes only one way, toward the faucet.
HI turn the boiler on to heating and see which pipe gets hot that will be your heating flow the return will be cold at first , then put on hot water only, pipe to hot taps will get hot , water inlet will get cold , you should be able to work it out from that the middle could well be the gas ?
sounds like the water line is frozen before it gets to heater. You can take a blow dryer and try to thaw the line.You should be able to hook up a hose on the hot side of water heater. turn valve off so it wont flow into house.You can turn on hot water valve on in kitchen but you will have to thaw cold and hot line. Make sure you know where water shut off is to the house just in case a line breaks.
It sounds like the Rinnai units are working correctly but you've got some plumbing problems. Any tankless heater has a minimum water flow required to keep the burners going. If the burners were going with very little water flowing through them to carry the heat away, the heat exchanger could overheat and fail. The solution is generally to the electronic controls to set the desired temperature and then just use hot water. Once you start mixing cold water in, you actually reduce the flow of hot water and the burners turn off. If you are right near the cut off point, the burners will cycle on and off resulting in those very annoying hot-cold-hot-cold showers.
The fact that you've got those very loud noises indicates some other sort of plumbing problem. Hooking up two tankless units in series is much more complicated. In heavy draw situations, the second unit is asked to finish heating the water up to temperature when the first unit couldn't quite get it there. Now you're putting hot water into a heater and heating it more. You have a lot more issues with fluctuating temperatures and pressures within the pipes which could conceivable cause these horrible noises. Everything's got to be set up right to for things to function properly and it's easy to get something wrong.
From your description, it sounds like a better solution would have been to mount the two heaters in different places. e.g. One in the basement to serve basement and first floor faucets. The other on the second or third floor to serve those two floors. Since these units are direct vent (don't use inside air), they can even be mounted in a closed closet as long as the vent can get to the outside. With this setup you avoid the complexities of a series installation and you also have a much shorter wait time (and therefore less waste) for the fixtures on the upper floors.