20 Most Recent Bosch AquaStar Indoor Natural Gas Tankless Water Heater with Vent Hood #125 - Page 6 Questions & Answers

need control tested to find what failed

It could be the thermostat sensor They usually have a carbon buildup. They are easy to install and not that expensive. Good luck

your not making sense with you question --state it goes cold in middle of shower --but state it will stay hot or cold forever ----if its the latter continued hot till you shut off water that normal working if the unit shuts down during shower then you have a problem ----unit is set at one temp and runs at that temp and you use shower 1 handle / 2 valve what ever you own to adjust temp their are really only 4 reasons stops making hot water ----2 are usually well water supply --incoming water pressure /flow or to cold ----other are gas valve -or sensor so i would look into your shower handles since almost all have adjustments and anti scold safety

SEEMS LIKE CALLING A LOCAL PLUMBER IS BEST WAY

most likely. contact a dealer for advice

try Bosch tech support .

check to see if voltage correct if not replace board if ok bad ignitor

WOW!!! Great answer by Steve (I know Steve Spam...real name Richard). Lot of time on his hands (37000 answers). Can we get real professionals answering questions. Thank you Richard...let's just call you Dick for short.

Are you holding the flame button until the thermocouple heats up.

you dont drain theses type water heaters

you can not drain these w/ heaters

first id check shower head most has a screen in them and do get clogged from time to time since the water flows good from faucets

One possibility - insufficient gas flow or oxygen starvation might be making the pilot light dip when the main flame is on so the thermocouple bulb is no longer heated. This will cause the main flame to go out and restore full pressure/sufficient oxygen to the pilot.

Is Bosch 1600is the correct model #, or 1600ps?

Slim chance but this link might have it https://www.manualslib.com/

the knob is an electronic control knob frozen? and usually its a set it and forget it type setting

iF YOU RAN OUT OF GAS, THE LINES MAY NEED TO BE PURGED OF AIR. dISCONNECT THE GAS FLEX AND TURN THE GAS ON TO PURGE THE AIR FROM THE LINE. dO THIS UNTIL YOU GET A STRONG SMELL OF GAS. aLSO, WHEN YOUR UNIT TRIES TO LIGHT, BUT THERE IS NO GAS, IT WILL TRY TO LIGHT THREE TIMES. aFTER THE THIRD ATTEMPT, THE UNIT LOCKS OUT. yOU MAY NEED TO RESET IT BY UNPLUGGING IT, OR IF IT IS HARD WIRED, JUST TURN THE BREAKER OFF FOR 10 SECOINDS AND THEN TURN BACK ON. tHIS WILL RESET THE GAS VALCE TO RELIGHT. gOOD LUCK!

Error code EA - No sparks for the electrodes The ionization electrodes are not making sparks when water is flowing. There are many reasons for this problem and here are some; low gas pressure, fan speed is low, wire connections are loose, the air in the gas line, no gas.

1) BOSCH website shows error codes.
FO does not appear:
http://www.boschhotwater.com/HelpfulResources/TechnicalSupport/BoschAquaStarModels/2400ESTechSupport/Troubleshooting/tabid/1295/Default.aspx

2) I do not see FO error code listed on Internet search
Other FO questions at fixya seem to have no answer:
http://www.fixya.com/tags/error_f0_bosch

3) At this point, I would suggest calling a service technician.
While waiting for service, read manual cover to cover several times.

4) Your manual is valuable resource, and shows the word 'maintenance' and 'troubleshoot' frequently.
Tankless are maintenance heavy, and should be de-limed each year.
U-tube search "delime tankless water heater."

5) Also explore Bosch website for your manual and other valuable information.

6) When service tech arrives, ask that person for tips and tricks about your unit that will help you maintain your water heater.

7) All costs are energy. Install DIY tank-type gas water heater and avoid the whole headache.
http://waterheatertimer.org/How-to-install-gas-water-heater.html

hi julia after checking on your bosch water heater error code e14 you can try to reboot your system but if code comes back you may need to find a plumber that knows your system to fix your fan system and clear your fault code. this is the site i got info from http://www.jimsplumbing.net.au/bosch-hot-water-system/troubleshooting-guide/error-code-e14/ p.s. this site is not in the usa