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I have a Bosch 10p system and when in use, the temp fluctuates hot to cold.

It a bosch water wizard 10p system and while having a shower, the gas burners goes out and water goes cold.

Posted by Anonymous on

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6 Suggested Answers

6ya6ya
  • 2 Answers

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Posted on Jan 02, 2017

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gary1121
  • 332 Answers

SOURCE: bosch 16p gas, keeps going hot and cold

check the thermostat, you will probly need someone that has worked on the same kind of unit, they are not all the same {tankless} I would suggest a repairman,, there is a little bit much to explain how to do it over the internet,

Posted on Jun 23, 2009

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  • 82 Answers

SOURCE: Bosch AquaStar 125b ng suddenly goes cold during shower

Does it happen to any other fixture? If not, it's most likely your shower valve and not heater.

Posted on Sep 04, 2009

dmftrucker
  • 1922 Answers

SOURCE: I don't know how to restart my old bosch water

get a long stick match, a flashlight remove lower inspection cover, find thermocouple and pilot light will be next to it,turn gas valve to pilot light and hold down,stick the match in by thermocouple till the pilot lights and hold valve down till pilot stays lit,this may take a minute or more,then release gas valve and see if pilot stays lit, if not retry,if it wont stay lit,the thermocouple is defective and needs replacement

Posted on Oct 06, 2009

  • 1 Answer

SOURCE: Bosch AQ125BNG Burner goes out even though the

Often, this is the result of a restriction of exhaust gases. This type of hot water heater must be adequately vented, (per installation specs). I found this out after taking a number of cold showers. :^( Two years later, and still counting, no more problems. :^)

Posted on Dec 06, 2009

  • 1 Answer

SOURCE: Bosch 2400E-NG output temp fluctuates

Tankless heaters do not like back pressure from anti scalding devices in shower controls. Every time they compensate and shove more coldwater to the hot side so you don't get burned when someon is using the cold water elsewhere in the home, it can reduce the heater below it's minimum flow rate and shut it down. Nothing wrong with the heater. Ask kohler if there is a wy to disable the device without buying a new unit entirely.

Posted on Jul 26, 2010

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1 Answer

Water temp fluctuates in shower how to correct


Open following link for Bosch troubleshooting resources:
http://waterheatertimer.org/Troubleshoot-Bosch-Tankless-water-heater.html

Bosch has a service bulletin that might apply to problem:
http://waterheatertimer.org/pdf/Bosch_Overcoming_fluctuating_temps.pdf
Links about crossover and low water pressure:
http://waterheatertimer.org/Crossover.html
http://waterheatertimer.org/Low-hot-water-pressure.html

Add a comment and say what you did to fix problem.

Jun 16, 2011 | Bosch AquaStar 2400ES-NG

1 Answer

Hi I have a Bosch water wizard 10p & although i have the heat turned up to the highest it is still not hot enough! I was wondering if there was another way of increasing the water temp?


Open following link for Bosch troubleshooting resources:
http://waterheatertimer.org/Troubleshoot-Bosch-Tankless-water-heater.html

Typical Bosch 10P manual shows temperature control illustration on Pg4, and includes low water temperatures on troubleshoot on Pg6
http://waterheatertimer.org/pdf/Bosch_10P-installation.pdf
Water flow rate too high, low gas pressure, faulty thermostat.

Two other things might be causing problem
Crossover:
http://waterheatertimer.org/Crossover.html
Lime build-up
http://waterheatertimer.org/pdf/Rheem-De-lime-tankless.pdf

Jun 15, 2011 | Bosch & Tankless LP Hot Water Heater

3 Answers

Water turns cold very quickly


I had the EXACT same problem (installed my tankless last winter and worked fine, now this summer it fluctuates, have to turn the shower completely off and then on again to get any hot water and then it only lasts for a couple of minutes!) Argh - it is frustrating!

Here's what I found: the demand for hot water is lower during the summer (hot) months because the "cold" water coming in is already quite warm. You don't need as much hot water to make the shower temp comfortable. SO, my tankless was shutting off due to low flow demand. I've removed the flow restrictor from my shower head and it helped alot but didn't completely solve the prob. Next step is what has been recommended to me by several people but is much more expensive - change the pressure valve on your shower to a temperature valve. Or just wait til winter and it should work ok again :)

Jul 06, 2010 | Bosch & Tankless LP Hot Water Heater

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

I have a newly installed Bosch hot water heater. After installing, it seemed to be working fine. It is in a small weekly rental unit. If anything, the unit is over-sized for the demand. Now that it is...


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 01, 2010 | Bosch & Tankless LP Hot Water Heater

1 Answer

Bosch tankless hot water heater: Confort TOO HOT!!!


Look for a water temp control on unit. Otherwise a lower temp can be attained by having a higher water flow to minimize temperature buildup in heating coil.

Sep 06, 2017 | Bosch & Tankless LP Hot Water Heater

2 Answers

Bosch 2400E-NG output temp fluctuates


This is a great heater. It is however crucial that it be installed to every detail of the manual. If there is trouble send pictures to Bosch tankless you can call 1-800-283-3787 ask for Bosch Tech support or go to boschhotwater.com click find a contractor and call the closest Bosch Service Provider most will travel.

Mar 04, 2010 | Bosch AquaStar 2400ES-NG

1 Answer

Water wizard 10P pilot light keeps going out


If the thermocoupler is defective the gas to everything is shut off. The coupler is the bulb that sits ib the pilot flame If it doesn't heat up it will sense no pilot and shut the gas off. They don't cost much and are easy to change. Good Luck, Ned

Sep 17, 2009 | Bosch & Tankless LP Hot Water Heater

1 Answer

Bosch water heater


I'd initially check for a cross connection (cold water leaking into hot water system). This can be done by shutting off the cold water feed to the tankless unit, then opening up hot water fixtures around the home. You should see the water come to a complete stop; if you see a steady stream of water, then you have a cross connection. The most common place for a cross connection is at single handled showers. The valve cartridge starts to fail over time.

Jul 09, 2009 | Bosch & Tankless LP Hot Water Heater

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