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Our Bosch Optiflow GWH 20 wont light, controller. shows error E0. Any ideas how to rectify?

Posted by Paul van Gemert on

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ray gallant

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SEEMS LIKE CALLING A LOCAL PLUMBER IS BEST WAY

Posted on Jul 18, 2021

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Can you help with these Bosch 715 EFS GWH Error Codes? AF, 40, 07 -

https://www.fixya.com/support/t13643459-a2_af_error_codes
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I have a Bosch gas tankless water heater, model GWH 425 EF. The igniter does not stop sparking once the flame is lit. What will cause this?

Your electronic ignition unit is not rectifying through the gas flame, it is a sensitive piece of equipment and has failed.
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My GWH 715 ES cannot restart after hot into cold water crossover

Check for obstruction in your watervalve. It has a flow meter, that needs to spin freely. Remove the watervalve and blow through it, you should hear it spin.
Also make sure you dont have an error code showing. Hold down your reset button for 5 seconds to reset an error code and get back to your set temp.
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I have a Bosch GWH 425 HNO propane Tankless Water Heater which began intermittently exploding when demand for hot water occurs.

Call a qualified service tech immediately.
Gas explosion indicates dirty combustion parts, and gas is not fully igniting when tankless turns on the gas. So gas builds up and then explodes causing serious damage to tankless, and serious risk to homeowner.

If you need further help, I’m available over the phone at https://www.6ya.com/expert/gene_9f0ef4df2f9897e7

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Where can i download a GWH 715 ES manual?

Are you looking for sell sheet pdf, or install-care manual, or service manual.
Search: GWH 715 ES manual .pdf
Adding .pdf to search parameter helps locate manuals.

Sell sheet with venting overview, technical and product specs:
http://www.globaltowne.com/manuals/sell_sheets/715-800SellSheetFINAL.pdf

Manual for ES high altitude, with installation, error codes and troubleshoot:
http://www.bosch-climate.us/files/201009031238250.GWH715ES_English_12.2008.pdf

I cannot find a service manual, or service bulletins:
http://www.bosch-climate.us/support-center/downloads/bosch-manuals/earlier-models.html
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What does Error code A3 mean and how to correct it ?

http://www.bosch-climate.us/files/201008311810050.G3-11_A3-E3_Error_Code_Troubleshooting.pdf
Check out Link for help.
I have same problem.
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Bosch on demand tankless water heater gwh 2400 E LP error code "

BOSH AQ 250 On demand propane water heater ran out of propane, got gas now, but get EC flashing on the display and the unit won't fire? Lost manual, any suggestions. Thanks, Jim
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Burner will not light

Try this web site!
http://www.protankless.com/BoschProHome/GasProducts/BoschGWH425HN/tabid/506/Default.aspx
Copy & Paste to Google search engine.
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