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Ben R Posted on Aug 04, 2014

Why won't My Bosch High-flow 21e water heater ignite ?

My Bosch instant hot water system occasionally ignites for a second, then goes out and won't reignite just after the gas bottle has been swapped. It has done it before and it took 2 days to fix itself. I think there is air in the system somewhere. Is there somewhere I can bleed the unit?

5 Related Answers

Anonymous

  • 88 Answers
  • Posted on Aug 26, 2009

SOURCE: I have hot air but no hot water in my dishwasher

Check to make sure your supply lines aren't crossed and that your hot water supply is connected to the dishwasher

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Anonymous

  • 248 Answers
  • Posted on Nov 01, 2009

SOURCE: My bosch 21e hot water system turns itself off and

micro switch

Anonymous

  • 1 Answer
  • Posted on Dec 17, 2009

SOURCE: Bosch gas hot water system won't turn on

i have a bosch 16h hydroflow hot water system that will not ignite.

kel1guy2002

Kelly

  • 3740 Answers
  • Posted on May 18, 2010

SOURCE: Water is coming out of air flow gap. I installed a

The leak in an air gap is usually caused by a clogged sink discharge line. Most of the time this is connected to the garbage disposal and there is food particulate in the drain hole where the dishwasher drain from the air gap to the garbage disposal connects.

Pull the sink connection hose off and clean the hole thoroughly. You can try testing the dishwasher/ air gap by placing the disconnected hose into a bucket during the pump out period. It should not leak. After this test...reconnect the hose to the sink connection.

If it is NOT connected to the garbage disposal then remove the hose and clean out the hole where the connection is made. This is a common problem and easily resolved by the user.

Thanks for using FixYa.

Kelly .

cosmos196

cosmos196

  • 8 Answers
  • Posted on Dec 23, 2012

SOURCE: Problems with bosch 1600h ng tankless wh igniting

I found that the solution to my issue of not igniting was due to a bad pilot electrovalve part #8708501249. It was about a $50 part that was bad from the start.
Really disappointing that Bosch's QA would let a such a defective part ship. I spent about 3 years of using a workaround with a fan blowing air to get ignition until it finally failed. I had a tech look over the system to point me in the right direction.

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Related Questions:

0helpful
1answer

Why is the Bosch high flow 21e system while showering going cool & then returns to the set temperature?

If your Bosch Highflow 21e hot water system is experiencing fluctuations in water temperature while showering, it could be caused by a few different factors. Here are some possible reasons for this issue:
  1. Flow rate too high: The hot water system may not be able to keep up with the demand if the showerhead or tap is allowing too much water to flow through. This can cause the water temperature to drop suddenly. Try reducing the flow rate by turning down the tap or using a low-flow showerhead.
  2. Water pressure fluctuations: If the water pressure in your home fluctuates, it can cause the hot water temperature to vary. This can be caused by various factors, such as other appliances using water at the same time, or changes in municipal water supply pressure. Installing a pressure regulator or a flow restrictor may help to stabilize water pressure.
  3. Blocked or dirty water filter: A clogged or dirty water filter in the hot water system can restrict water flow, causing the water temperature to fluctuate. Check the filter and clean or replace it if necessary.
  4. Malfunctioning thermostatic mixing valve: The thermostatic mixing valve (TMV) regulates the water temperature in the hot water system. If it's faulty or dirty, it can cause temperature fluctuations. A licensed plumber or technician can inspect the valve and replace it if necessary.
  5. Faulty temperature sensor or control board: If the temperature sensor or control board in the hot water system is faulty, it may not be able to maintain a consistent water temperature. A technician can diagnose the issue and repair or replace the faulty component.
If you're unsure about how to diagnose or fix the issue with your hot water system, it's best to contact a licensed plumber or technician for assistance.
0helpful
2answers

Why is my Bosch high flow 21e heater started working intermittently only heating water after tap is turned on and off a few times

Check gas pressures first especially on low setting. Ensure gas burner is clean get unit serviced if over 2 years old. Check or replace water flow sensor & clean inlet filter.
0helpful
1answer

Cannot find pilot light on my bosch GWH635ESL, help!

Call Bosch
Gas Products Technical Support: 800-642-3111

That model number is only shown at one website, and that model number is not shown at Bosch.
Open following link for Bosch:
http://www.boschwaterheater.com/BoschHotWatercomHome/GasProducts/tabid/331/Default.aspx
Search of Bosch for that model number shows no result.

Some water heaters do not have a pilot light. Instead they use hot surface igniter rod that glows red hot
The igniter rod ignites the gas after solenoid valve opens and gas flows to combustion chamber.
The igniter rod and heat sensor have to be operational, and have to be positioned correctly for ignition to take place.
If igniter rod is not working, or if heat sensor does not detect flame, then gas solenoid valve shuts down and water heater does not heat water.
0helpful
1answer

I have a bosch system 21e it is, i was told to ignite the pilot light, can you tell me how this is done?

Consult your owners manual.
http://www.bosch.com.au/content/language1/downloads/70R_UserManual1023.pdf
Heres a new one if you don't have or lost yours. You can't, you got bad advice. tankless system don't have a running pilot light. They operate by detecting water flow and then turning on. Many also state on the lighting instructions to NEVER try and manually light the pilot. Try Bosch tech support. Lowes sells Bosch heaters and they might be able to help you get the support number faster. Hope this helps but please don't go sticking a flame inside there.
0helpful
1answer

My bosh 21e hot water system truns itself off. the only way i can get hot water again is to unplug from power

Best I can offer is troubleshoot resources, including Bosch contact numbers and possible troubleshoot links and possible manual.
http://waterheatertimer.org/Troubleshoot-Bosch-Tankless-water-heater.html

And then you add a comment with solution that worked so others with same problem can read 1 possible answer for their identical problem.
Check back since people occasionally add a comment.

Solve most tankless problems yourself, same day, all brands for $330.
http://waterheatertimer.org/How-to-install-gas-water-heater.html

Absolutely feel obligated to upvote the free help.
Or take advantage of fixya paid help.
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.
0helpful
1answer

Bosch 25e water heater wont ignite

combi or standard if combi pressure too high and will be blowing off your high pressure release valve which would stop your boiler from igniting best of luck
0helpful
1answer

Once hot water is open the gas is burning and water is not heated

Sounds like the flow is too high and or the temp set too low.
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