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Bosch 24i junior combi boiler light flash 4 times a second; not sparking at ignitor; the electrodes are clean though the gap was 6/7 mm, central heating water was over filled; drained this away out of the prv

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  • rmullinsplum Sep 28, 2010

    hello my mate; the boiler igniter was working earlier as the boiler fired up and ran for a short while; albeit not well; it kept trying to cut out and the igniter fired it up again over 2-3 minutes; i have a service manual and have tested various components and parts of the wiring loom; as far as i'm aware it tested out as it should; no visual damage and continuity between components; the pcb shows no blackened or burned sections and none of the fuses have failed; the sensor for DHW is only a light push fit on the pipe via a pressed steel clip; i'm not certain as to how tight a grip this would have had originally; can i test these or just fit new; the manual recommends using heat paste to ensure contact; is possible to test the fuel gas valve;the fan works and the flue is clear;

    The filling loop was left attached whilst the service valve was not fully shut is how the system came to be overfilled; I have disconnected the filling loop and drained the system to 1 bar; the water shows no sign of inhibitor being used;

    what is the turbine fitted in the heating circuit actually for?

    i am somewhat flumoxed at present and will receive your suggestions with pleasure;

    Many thanks Robbie
















































































































  • rmullinsplum Sep 29, 2010

    hello my mate; the igniter was sparking; yesterday it kept re-igniting the boiler as it kept shutting down; the flame on the burner died as if there was no gas; as this boiler is in the kitchen of my mates restaurant we've conceded that we have no option other than to replace it; you cant have a kitchen with no hot water; the commisioning date is 02, so methinks its had it's fair share of use; many thanks for yours help; Robbie

  • rmullinsplum Sep 30, 2010

    all information supplied was good; some of it just to reaffirm my intuition and allow me act upon gut feelings; many thanks to you people that helped; Robbie

  • rmullinsplum Sep 30, 2010

    I'm sorry that i didn't accept your advice; this is the first time i've used this service so you weren't given the credit you are due; I apologise for this error on my part; I dont know whether i'm able to go back and 'accept' your advice now; i couldn't see a relevant box; Sorry mate; Robbie

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  • Master
  • 1,515 Answers

Hi, Have you determined if you have power to your ignitor first of all? The boiler control light is flashing 4 times due to an error, do you have a chart that tells the codes on this boiler? The first thing I would check if you have a meter, if not try and get one is to find out if you have power at this ignitor module. If you do, more then likely the ignitor is faulty if its calling for heat. If you have no power, you would need to go back to find what supplies power to the ignitor. It should be the control stat that does this. Its a process of elimination at this point to track down why the module/ignitor is not firing on a call. If you have any kind af manual or schematic to look at, this will come in handy to find out what is going on, and what has failed in the system with the 4 flashing code lights. Try and get a meter and check for power to narrow these controls down, you may just have a faulty ignitor as they are normally the first part to fail. Please keep me posted.
Sincerely,
Shastalaker7
A/C, Heating, & Refrigeration Contractor.
PS, check all of your safeties as one may have the ignitor locked out.

Posted on Sep 28, 2010

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  • Robert Horton
    Robert Horton Sep 28, 2010

    Hi, just wanted to add a comment, how did the system get overfilled? I take it the water was cold and you are using the PRV to drain off the access water? On a lot of boilers, they have a safety that will prevent the boiler from firing if the water level is to high. I am not sure how your system is set up but have worked on many commercial units that are basically the same. Normally, they would have a float system to keep the water at a certain level along with a water pressure gauge and a hot water temperature gauge. Being that the unit overfilled, this may be why the ignitor is locked out. Check your safetys.and your water P.S.I., should be around 15 P.S.I. on most systems, yours may be different. Please keep me informed,
    Thank you,
    Shastalaker7

  • Robert Horton
    Robert Horton Sep 29, 2010

    Hi, Robbie, sorry but I have been out on a job that has taken me away from the Internet. As far has the heat paste, this would be the best way to go on the snap on clips. As far as this turbine you are speaking of, that is something I have not ran across on the boilers in this part of the Country. I would thing it may give you a clue in the manual you have. I see you have already rated me, and I am sorry I couldn't be of more help.
    Sincerely,
    Shastalaker7

  • Robert Horton
    Robert Horton Sep 30, 2010

    Thank you Robbie for the outstanding rating. You are a good man. I wish I were on site to see this beast to help you futher. I wish you all the luck and hope for the best outcome.
    Shastalaker7

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  • Master
  • 2,777 Answers

So the main issue is no spark at the ignition? Is it trying to spark, do you hear it attempting to fire but it just won't? Have you considered that it may just be a bad ignitor?

Thanks
Tim

Posted on Sep 29, 2010

  • Tim Grayson
    Tim Grayson Sep 30, 2010

    No problem, that was going to be my advice as well. If possible please come back to the question here and click the Accept This Solution button, otherwise I don't get credit for the help provided.

    Thank you so much,

    Tim

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