20 Most Recent Bosch PowerStar AE125 AE125 Whole House Electric Tankless Water Heater... - Page 7 Questions & Answers

diverter valve may not be seating on ch side letting water to pass.

Yes you need to delime tankless each year.http://waterheatertimer.org/pdf/Bosch_Descaling-heat-exchanger.pdfhttp://waterheatertimer.org/pdf/Rheem-De-lime-tankless.pdfContact Bosch for exact repair information. My records show following number for tankless gas: 800-642-3111 http://waterheatertimer.org/Troubleshoot-Bosch-Tankless-water-heater.html If you need further help, I’m available over the phone at https://www.6ya.com/expert/gene_9f0ef4df2f9897e7

try looking at this. might be a thermostat problem, usually a cheap fix and found on feebay. https://www.bosch-climate.us/files/201009031229480.635ES_English_11.2007.pdf

Not sure but check the inlet water at the heater, the filter may be clog up a little that restrict the flow. Did u use the heater at all during the winter? If not, the heat exchanger may be clogged with built up in there. U need to descale it. Good luck. Chinhcu

Sounds like the thermocouple is not holding and dropping the pilot out , so its could be the thermocouple or the valve it connects in to . But you can always contact bosch tech help line they are on line

It may well be a honey well which you can just change the motor . The top cover should come off 1 screw holding it and lift off you should see the motor there . Most plumbing and heating shops will stock replacement motors .

Sounds like a flow sensor may be bad. It may be registering flow when there is none and it sending signal to ignitor and gas solenoid that there is.

Hot water sensor defective

Error Codes and Troubleshooting Bosch Tankless

Check for water leaks on the system also check pressure relief it may be passing water .

Have you bled the rads of air

Contact the local distributor of the product for the exact information you need about installation. If you are on city water you should be fine.

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 [email protected]