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Bosch 25E will not ignite to heat the water. - Water Heaters

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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

Read manual cover to cover, make sure tankless receives yearly maintenance as outline in manual.

Add a comment with your experience so others with same-similar problem can benefit.

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 Apr 06, 2011

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Why does my bosch 25e ingnite then blows out repeatedly and occasionally stays on if i turn tap on and off and on for abit.


Does the unit have a flame sensor? Check manual. Flame sensors get corroded and need cleaned or replaced. I have had success cleaning them but when you can buy a new flame sensor

Apr 25, 2014 | Bosch Water Heaters

1 Answer

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.

Sep 03, 2011 | Bosch Water Heaters AquaStar - Tankless...

1 Answer

Our tankless water heat will not heat the water-it won't ignite


Question posted under Boasch tankless. Model number not known.
Before calling service technician, open following link for Bosch troubleshooting resources, including phone and contact for Bosch, error codes, and possible manual, plus hours of reading and research:
http://waterheatertimer.org/Troubleshoot-Bosch-Tankless-water-heater.html

As you know from reading manual, tankless water heaters require yearly maintenance by trained service technician, or by homeowner. This action would check gas and pressure, venting draft, condensation drain, burner and combustion parts, igniter and-or pilot light, electrical connections, air intake and general condition of plumbing.
Problem you describe does not include error code.
Open following link for possible help with general plumbing problem:
http://waterheatertimer.org/pdf/No-Error-Code.pdf

Add a comment with model number that appears on side of unit, and I can directly locate possible service bulletins and further troubleshoot resources available at Bosch for possible do-it-yourself diagnosis and repair.

Sep 02, 2011 | Bosch & Tankless LP Hot Water Heater

1 Answer

My Bosch GWH 425 EF will not ignite. Have had this water heater 3 years - it is happening more & more, plumber that installed it says it supposed to do this....pretty sure it's not.


im leaning towards the thermo coupler its like a eye only it measures the heat at the pilot tight if it tells the unit its off it shuts down and turnes the gas off thats why you have to keep relighting hope this helps.

Apr 26, 2011 | Bosch GWH 425 EF L Water Heater

1 Answer

Bosch 25E natural gas heater has stopped heating the water Is there something basic I can do to correct this Thanks, Sam


1) Call service technician, and when that person arrives, ask about tips and tricks for maintaining tankless water heater.

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

3) Add a comment with your experience so others with same problem will benefit.

4) 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, but does not take place of service call since you will be doing the work yourself, on a complicated appliance that is affected by perfect cooperation of internal parts, and external factors.

Apr 05, 2011 | Bosch Indoor Gas Tankless Water Heater...

1 Answer

Bosch 10h dosent want to ignite and heat anymore low pressure light flashes


Hi,
The unit is plugged up with mineral buildup from the water going through it... it will need to be cleaned internally....this is done by running an acid solution through it to clean out the mineral buildup...

Then it will work again...

heatman101

Jan 31, 2011 | Bosch Water Heaters

3 Answers

Bosch tankless GWH 2400 ELP in use 2-1/2 years. Whenever it is below freezing, we have problems with EC and/or EA errors, and no hot water. Sometimes restart will work. Bosch customer support is useless. I...


are u using well water or hooked up to city line if well water --may be to cold for unit if water is below a certain temp unit usually goes into error or shuts down if un heated space where water heater is u may have to warm [ insulate ,heat tape etc]the incoming water usually water that around 40 degrees causes problems

Feb 03, 2010 | Bosch & Tankless LP Hot Water Heater

1 Answer

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

Oct 27, 2009 | Bosch Water Heaters

5 Answers

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.

Mar 23, 2009 | Bosch 1600H-NG Natural Gas AquaStar...

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