Question about Bosch & Tankless LP Hot Water Heater

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Heater starts up but then shuts off right away. No hot water

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Open following link for Bosch tankless troubleshooting resources including parts, Bosch contact information, typical manuals, error codes, tech support, fuel-saver calculator, water heater forum, fixya links, disclaimers, and for finding service technician.
http://waterheatertimer.org/Troubleshoot-Bosch-Tankless-water-heater.html

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Posted on Mar 29, 2011

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Posted on Jan 02, 2017

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Ok to turn off water to heater?


yes it is best too in case the heater starts, there is nowhere for expansion.

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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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My atwood rv water hearter is not working right


Model # please? Does it spark outside when first turned on?

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The burner on the heater is working bu can't get water to stay hot at the faucets or showers water turns cold right away. whats the problem?


Test for crossover, where bad faucet cartridge or recirculation check valve keeps hot from reaching taps
http://waterheatertimer.org/Crossover.html

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Feb 28, 2013 | Rheem Water Heaters

1 Answer

Why does water suddenly go cold during shower? It only happens in master bath... guest bath shower does not cause same problem. I have to go outside and unplug and plug back in heater to get it to start...


Try running the hot water in the sink while you have the shower. If the water in the shower stays hot, then the problem is not enough flow through the water heater to keep the heater running. I am guessing that the master bath is further away from the water heater than the guest bath. If not I would check the shower nozzle in the master bath to see if it is clogged a bit or if it is a water saver nozzle because this will slow down the water volume and then cause the water heater to shut off the heat.

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I have a Reliance Sta-Kleen 805 Electric Water Heater that is leaking from the cold valve but the water is coming out hot. How do I repair it?


If I understand correctly you have residential electric water heater, and your shut off valve located above water heater on cold-water line is leaking?

1) Hot water would come out of this valve if it's leaking because water inside tank is hot and under pressure ... also remember, hot water rises so tank is probably heating the water inside the cold line during hours when no hot water is being used.

2) You probably need to replace the valve. But if water is leaking because a pipe is rusted, the valve may be ok, and just the pipe needs to be replaced.
Take a photo of your problem to hardware store or home center.
I used to work in those stores and could help folks get the right parts.

3) Here are some steps for replacing the valve.
Shut off main water source into house. This is usually located underground in same box where meter-reader looks at meter.
Your water heater shut off valve is called a gate valve, and it will be 3/4"
All water heater pipes are 3/4"
You will need two 10-12" pipe wrenches, maybe a new gate valve, maybe a new flex connector, probably short 3/4 pipe pieces, teflon tape for each threaded pipe.
Hardware store or home center can get you the right materials, just take a photo over to hardware store

4) When you get started, turn off water heater circuit breaker for a couple hours so water will cool down. You don't want to get scalded with hot water.
Do NOT drain the tank.
Simply open a bathtub faucet on hot side to release pressure.
When finished, turn on the water, and make sure water is flowing out of tub spout in full stream before turning circuit breaker ON

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Jan 23, 2011 | RELIANCE ELECTRIC WATER HEATER

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This on demand hot water heater works ok but it sends a gallon of cold water through it before the hot water starts. Is there a way to tweak it so it starts heating the water right away?


feel the pipes coming from the water while you turn the hot water on. It does come out hot, but it has to push the cold water through the lines first (the water that has been sitting in the pipe)

Dec 05, 2009 | Bosch Water Heaters AquaStar 250SXO...

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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...

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Hot Water Heater in 1991 Pace Arrow RV is not working


If you look on the outside of the RV, you will find the vent for the water heater behind and access door. There usually is a drain plug and valve located as well. Generally they will be tucked away under the kitchen sink area with internal access as well. You will need to find where the valve that shuts the water off to the unit is and turn it on. Most times the water heater is either electric or propane. But sometimes they are only propane. Once your find the access door, you will know where the water heater is. You can also contact Fleetwood who makes the Pace Arrow to see if they have any information on your unit. Usually your unit info or trim number will be located on a little plaque right by the entrance to the RV. You will need this when you contact them. Hope this helps.

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