Question about Bosch PowerStar AE115 Tankless Water Heater...

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Only using cold water and light turned of

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You posted under Bosch electric tankless.
I don't know specifically how to fix your tankless from information given.
Tankless problems can be simple or complex, and include internal and external factors best gauged by experienced service technician who is there and can put hands on the appliance.
You can also glean information from the service technician how to best maintain your tankless unit, since they require yearly maintenance, such as de-liming.

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

Add a comment for more free help.
Also take advantage of fixya expert assistance live.
For a price, expert works with you while you work on water heater or any do-it-yourself project.
Fixya is always less expensive than a service call.

Posted on Mar 24, 2011

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Junior 24i intermittent hot water heating works fine and the green light comes on when turn hot water tap but water cold


sounds like you need a plumber many tanks have an internal pipe that sends the cold water to the bottom of tank called a DIP tube plastic and they fail

Feb 23, 2015 | Water Water Heaters

1 Answer

The unit has not been used for some time. How does one get to 70 degree C of the water in the tank? What is the proper procedure to follow to initialize the heater?


If it hasn't been used for a long time and it's still connected, turn off the cold water and drain the tank. Then turn the cold water back on and fill the tank, make sure you turn on a hot water spigot that's furthest away from the tank until the air sputtering quits then turn it off.
Light the pilot and set the dial for the temp. you want. Don't set it so high that an older person (like me) or a child can burn themselves.

Jan 05, 2011 | Rheem 50 Gallon FVR NATGAS Water Heater...

1 Answer

Hot water is spraying out the plastic coupler that comes out of the water heater up to the pipe. Want to know if there is any way to fix this problem in expensively.


First thing to do is wrap rag or towel around spraying joint to localize water.
Next, turn off power to water heater.
If gas, rotate knob to pilot so pilot light stays lit but burner does not come on
If electric, turn off circuit breaker.
Close cold-water shut off valve above tank.
Open tub valve to release pressure on water heater.

Wait for water to cool before working on water heater to avoid high pressure scalding water.
When finished, make sure tank is full of water and water comes out of tub valve before turning on power.

Water heater should not have plastic couplings.
I can't see your problem exactly, but water heaters have 3/4" nipples coming out of top.
Easiest solution is use flexible connectors from Lowes or Home depot.

geno_3245_158.jpg geno_3245_159.jpg

Flexible connectors are 24" or 30" long and have 3/4" nut on each end, so disassemble existing pipes using pipe wrench.
Lowes and Home depot can help you select appropriate pipe >> take several phone-photos of your pipes to home center so they can see your problem precisely.
Attach 3/4" male adapter on end of pipe.
Attach flexible connectors between pipe and water heater nipple.
Cold water line has shut off ... make sure this attached to nipple marked cold.
Make sure hot pipe is attached to nipple marked hot.
Use teflon tape on threads.

Add a comment if you need more help.

Dec 09, 2010 | Rheem Water Heaters

1 Answer

Water heats, then turns cold


These units need lots of flow to start and run. Set the temp on the unit lower and the people in the shower will have to use more hot and less cold which will make the unit more stable.

Jun 29, 2010 | Bosch AquaStar Indoor Natural Gas Tankless...

1 Answer

125FX (with FXhood) turns off while in use


may be overheat stat or fan check little hose at fan area for pinhole best of luck

Oct 19, 2009 | Bosch AquaStar 125FXKIT-NG 125FX Natural...

1 Answer

When i turn on the cold water to adjust the temperature of water - the hot water turns completly off. I cannot turn on the cold water at all. It is either all hot water or all cold.


It might be a question of inadequate flow. All tankless water heaters have a minimum flow rate that must be met, typically .5-.9 gpm, before the heater will operate. In the summer time the incoming ground water temperature is higher, causing you to mix more cold water and less hot water to get a lukewarm temperature. This can reduce your flow rate near or below the minimum flow rate.
Here's a test for you, try running running a sink while taking your next shower. If the hot water remains mostly constant throughout, then your problem is with flow at the showerhead. The flow at a shower head can be reduced by buildup of scale and sediment. Also all showerheads have a flow restrictor that limits flow to 2.5gpm (some even less). Removing the restrictor will increase the showerhead flow rate as well.
Also look for any error code displayed on the digital read out of the heater. Some heaters will flash on their burner indicate light as well.

Aug 17, 2009 | Water Heaters

1 Answer

Water heats for about 3 seconds and goes cold


Take the cover off and look for reset that has trip.If you can't find no reset turn the power off and wait for five minutes,turn on and turn water on also to see if you get hot water.

Mar 14, 2009 | TitanNet TITANTANKLESS. COM PRESENTS THE...

1 Answer

No hot water coming out


check ur pilot light if it doesnt staay lit replace the thurmocuple

Jan 17, 2009 | Water Heaters

1 Answer

No hot water at all


is the pilot light lit? try to turn the temp up on it useing the dial in the front of the gas valve. check the cold water feed turnd on to the water heater

Dec 30, 2008 | Rheem 40 Gallon FVR NATGAS Low WATER...

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