Welcome! Here are the website rules, as well as some tips for using this forum.
Need to contact us? Visit https://heatinghelp.com/contact-us/.
Click here to Find a Contractor in your area.

Bosch Greenstar getting EA code intermittently.

davhead Member Posts: 12
Newly installed Bosch Greenstar ZBR 283A gas fired boiler going into "EA" fault mode intermittently. Run and starts fine for days ,then goes into EA . Simple reset usually restarts it, but did degrade to a point where I had to adjust gas throttle to get it to light. Still faults out intermittently. NG pressure 8.5.


  • Ironman
    Ironman Member Posts: 7,119
    Is that the pressure with all appliances full on and the boiler at full fire? Was a combustion analysis done with a digital analyzer?
    Bob Boan
    You can choose to do what you want, but you cannot choose the consequences.
  • GW
    GW Member Posts: 4,605
    That's one of the special "could be a number of things" codes. Did you set your high and low o2/co2? Check out the manual, it's a list of things to look at. Or call Bosch. You're the installer? Maybe peek at the igniter and flame sensor too.
    Gary Wilson
    Wilson Services, Inc
    Northampton, MA
    [email protected]
  • nwg51
    nwg51 Member Posts: 1
    Had a similar problem with a newly installed Bosch Greenstar ZBR 21-3, turns out the condensate was not draining adequately, trimmed drain hose to assure the condensate would flow freely to the drain.