Question about Bosch & Tankless LP Hot Water Heater

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No hot water

My Bosch Highflow model ys2433r is not giving any hot water. the display in the bathrooms is blank except for a flashing #14. I tried turning off the power to the unit and it does the same thing.

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Diaohragm valve or micro switch

Posted on Oct 12, 2009

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We have had major blackouts does my bosch highflow 21e need to be reignited or automatic....how long should it be until I get hot water


you have to reignite it yourself turn dial to pilot and press down the light with either the internal igniter or a long match when lit then you turn dial to the ON position .

Apr 25, 2015 | Bosch Water Heaters

1 Answer

My Boch 24ES Highflow Hotwater is showing Code 14 and only runs for i minute then shuts off


Code 14.
What water heater do you have?
Question posted under tankless Bosch, but these error codes start with a letter.
Rheem/Richmond etc Tankless has error code 14
http://waterheatertimer.org/Troubleshoot-Rheem-Tankless-water-heater.html
http://waterheatertimer.org/pdf/Paloma-Tankless-Error-Codes.pdf
Call tankless service technician.
Ask technician how much it costs to have recommended yearly service.

Or install whole new tank-type gas water heater yourself for $350 from local box store, and avoid the entire headache, then sell tankless online for parts.
http://waterheatertimer.org/How-to-install-gas-water-heater.html

Aug 09, 2012 | Water Heaters

1 Answer

Bosch YS2039R service manual


Can someone please help me fine a link to a Bosch highflow 18e hot water system manual to set the temperature or send it to my email alannoyes1@bigpond.com

Jun 03, 2012 | Bosch Water Heaters

1 Answer

We have a bosch tankless water heater in a 1600 sq ft home...it works great except in one faucet (the spare bathroom sink)...sometimes the hot water comes out, sometimes it doesnt, sometimes it takes...


Since you have hot water at all the other fixtures, the problem lies in the sink, not the water heater. It could be that the sink is farther away from the water heater than the other fixtures. It would take longer to get hot water.

Aug 29, 2011 | Bosch 1600H-NG Natural Gas AquaStar...

1 Answer

Hi my Bosch 18 e highflow instantaneous hot water service, turns water cold after a minute or so then stays cold. When you turn the water off the pressure valve keeps pulsating for about 5 seconds. The...


Open following link for Bosch troubleshooting resources, including contact phone numbers and possible manuals.
http://waterheatertimer.org/Troubleshoot-Bosch-Tankless-water-heater.html

If the conversion was made 3 years ago without a problem since, it might not be a factor.

May 05, 2011 | Water Heaters

2 Answers

I have a bosch YS2433R 'Highflow' hot water system. It has a YPRM34XB controller. The controller constantly flashes the number '99'. My home has no hot water. How do I fix this error on the controller so...


Solution for a code 10 or 99 (for my own reference as much as anything!)
Hit change and the down arrow on the controller for 3 seconds.
Wait for the controller to beep and display 00 before using the down key to display 93.
Hit the On/Off button until 000 is displayed on the screen.
Press change and down simultaneously and the controller should revert to the pre set temperature. Hey presto! Hot water!!!

Nov 01, 2010 | Bosch & Tankless LP Hot Water Heater

1 Answer

Worcester Bosch Highflow 400 Boiler - no hot water or heating


Normal 0 false false false MicrosoftInternetExplorer4 /* Style Definitions */ table.MsoNormalTable {mso-style-name:"Table Normal"; mso-tstyle-rowband-size:0; mso-tstyle-colband-size:0; mso-style-noshow:yes; mso-style-parent:""; mso-padding-alt:0cm 5.4pt 0cm 5.4pt; mso-para-margin:0cm; mso-para-margin-bottom:.0001pt; mso-pagination:widow-orphan; font-size:10.0pt; font-family:"Times New Roman"; mso-ansi-language:#0400; mso-fareast-language:#0400; mso-bidi-language:#0400;} Hi, this is Worcester, Bosch Group

Although we don't currently offer live technical support online, our Technical Support department will be able to help. Their number is 0844 892 3366 - they're open 6 days a week and on average answer calls within 20 second. If you want to know more about our Technical Support department visit our website

http://www.worcester-bosch.co.uk/homeowner/customer-service/customer-technical-support

We look forward to helping you

May 13, 2010 | Bosch Water Heaters

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