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riello f5 burner not firing

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Richard_d
Richard_d Member Posts: 4
in Strictly Steam

sputtered shut down would not restart

replaced filter, nozzle cleaned screen on pump … still would not fire .

checked power, fuel from tank … all good .

checked capacitor was supposed to be 12.4 micro farads mine tested at 9 …. therefore replaced. …. still would not fire … replaced control box still would not fire.

replaced fuel pump still would not fire. replaced electrodes still would not fire

replaced solenoid … still would fire, replaced nozzle again thought maybe I contaminated still not firing …

fan motor will run when jumping 5&6 …..could it still be the motor?

any help appreciated

Comments

  • HydronicMike
    HydronicMike Member Posts: 264

    Call a competent pro experienced with troubleshooting and setting up combustion on a Riello burner. Especially if you don't have the correct vacuum and pressure gauges (with adapters), and a combustion analyzer, and smoke tester-and know how to use them. When you replaced the pump, what was the existing pressure and did you set the same pressure on the new pump?
    If you knew what you were doing you wouldn't have had to replace all those parts.
    I've been fixing burners for over 35 years, I've never replaced all those parts on a Riello. Probably a dozen boxes, a few motors, 1 set of electrodes, a few motors, a few solenoids. Components rarely fail and are easy to check.
    You probably haven't properly bled the system, have a vacuum leak or restriction, and/or don't have combustion set up properly.
    If it ran when you jumped 5 & 6, it's not the motor.

  • Richard_d
    Richard_d Member Posts: 4

    replaced the pump oem from riello without adjusting pressure riello said they are shipped @ 145-150psi which is what my boiler calls for . It is a buderus g115 was installed 5 yrs ago.

    HydronicMike
  • EBEBRATT-Ed
    EBEBRATT-Ed Member Posts: 19,721

    @Richard_d

    You have replaced so many parts it difficult to say what is going on.

    Does it try to start and go on lockout?

    Or it doesn't try to start at all?

  • Richard_d
    Richard_d Member Posts: 4

    tries to fire but does not .. initially before replacing capacitor fan motor would not run even if jumped across 5&6 …. now motor does run when jumped ….

  • HydronicMike
    HydronicMike Member Posts: 264
    edited January 4
    https://forum.heatinghelp.com/discussion/comment/1880824#Comment_1880824

    You have to check/confirm with pressure gauge. As mentioned, you MUST get a competent tech experienced with Riello burners. It would’ve been a lot cheaper than replacing all those parts.

  • EBEBRATT-Ed
    EBEBRATT-Ed Member Posts: 19,721
    edited January 5

    Since you changed the motor and the pump you probably missing either spark or fuel.

    Maybe disconnect the nozzle line from the pump and see if you're getting oil and check for spark. The electrodes have to be set right.

    AS @HydronicMike mentioned you're in this pretty deep. You really need a tech with the correct tools and a combustion analyzer

    Your oil supplier must have a tech or know of one if your buying oil from a company with no service.

  • HVACNUT
    HVACNUT Member Posts: 7,266

    Any Riello OEM setup for the G115 shows pump pressure anywhere from 160 to 205 psi depending on size, so IDK where you got 145-150 psi from. This is not DIY. Where are you located?

    GGross
  • Richard_d
    Richard_d Member Posts: 4
    IMG_0812.jpeg
  • HVACNUT
    HVACNUT Member Posts: 7,266
    https://forum.heatinghelp.com/discussion/comment/1881111#Comment_1881111

    Pretty close to Riello retrofit specs.

    Screenshot_20260106_162141_Samsung Notes.jpg

    Do you have Riello pressure and vacuum gauges? Is there atomization in the chamber? Have you looked down the air tube? Giant coke ball sitting in there?

  • Big Ed_4
    Big Ed_4 Member Posts: 3,385

    Tries to start ? Just a flash then locks out ? Try a .75 60 W instead of the B . It could be the mix of the fuel oil .. Years ago we had a standard … I only use W now…

    There was an error rendering this rich post.

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