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Crown Bimini BWC225 Error Code E03

ChucksOldBoiler Member Posts: 14
My Gas fired Crown Bimini BWC225.
It's only 12 years old and now reads error code E03
I replaced the ignition electrode & cable.
Also cleaned the heat exchanger which was very clogged.
Still has error code E03. Any ideas?


  • 109A_5
    109A_5 Member Posts: 1,341
    @ChucksOldBoiler ,

    I'm wondering why you "I replaced the ignition electrode & cable." ? Cleaning the Heat Exchanger probably would not have hurt, but may not have gotten you any closer to the E03 situations remedy.

    Using the manual found here;

    Table 13.4: Hard Lockout Codes Displayed (Manual page 53, PDF page 55)

    E 03 - Gas valve error
    • Loose or defective gas valve harness. Check electrical connections.
    • Defective gas valve (check for 24 VDC at harness during trial for ignition before replacing valve)

    Once the condition that caused the lockout is corrected, the boiler will need to be manually reset using the RESET button on the display.

    I assume you tried the reset.

    " The BWC boiler uses a microprocessor based control, known as a “MCBA ”

    Apparently the MCBA has a Supervisory or Monitoring capability so it thinks there is a problem with the Gas Valve or the Gas Valve's circuit or wiring harness. I would pursue that direction.
    National - U.S. Gas Boiler 45+ Years Old
    Steam 300 SQ. FT. - EDR 347
    One Pipe System
  • EdTheHeaterMan
    EdTheHeaterMan Member Posts: 7,554
    edited June 2022
    You can try removing the wire connector from the gas valve and replacing it. This small procedure can "clean" the contact between the plug and the pins to improve the electrical connection.
    Edward F Young. Retired HVAC ContractorSpecialized in Residential Oil Burner and Hydronics
  • ChucksOldBoiler
    ChucksOldBoiler Member Posts: 14
    The gas valve is defective.
    Thanks for all your help guys.
    Case closed