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Help with Bosch combi

mgadow
mgadow Member Posts: 1
edited August 14 in Gas Heating

I have a Bosch combi unit, about 5 years old. Was a new model at the time. It is now locking out with “EA” every day (usually happens overnight) and sometimes several times a day. Also, there is a loud “thud” sound that comes from the mechanical room that I have not been able to specifically locate yet. It’s only happened a few times and not every time it locks out.

I’ve had the local techs out twice, and they replaced the expansion tank, but it locked out again that very night, and they seem stumped.

Any ideas? Gas valve?

Comments

  • Big Ed_4
    Big Ed_4 Member Posts: 3,019

    The igniter flame sensor may need to be replaced , every 5 years . Check the condensation line ,make sure there is proper drainage and the end is not in water , it should have a air gap …

    There was an error rendering this rich post.

    kcopp
  • Ironman
    Ironman Member Posts: 7,548

    The “thud” that you’re hearing is probably delayed ignition. As Big Ed mentioned, the igniter needs to be replaced. In fact, after 5 years, the heat exchanger needs cleaning and a complete maintenance done.

    I’d suggest that you find more competent technicians.

    Bob Boan
    You can choose to do what you want, but you cannot choose the consequences.

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