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Intermittent Spark Ignition in Worcester 24i RSF-L Combi Stove: Possible Causes

roleczka0 10584 11
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  • #1 17387414
    roleczka0
    Level 2  
    Posts: 4
    Rate: 6
    I have a problem with my worcester stove. Sometimes the spark ignites, unfortunately sometimes it doesn't. The current is coming, but it works as I see it.
    What could it be, please help

    Intermittent Spark Ignition in Worcester 24i RSF-L Combi Stove: Possible Causes Intermittent Spark Ignition in Worcester 24i RSF-L Combi Stove: Possible Causes Intermittent Spark Ignition in Worcester 24i RSF-L Combi Stove: Possible Causes Intermittent Spark Ignition in Worcester 24i RSF-L Combi Stove: Possible Causes
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  • #2 17388138
    piracik
    VIP Meritorious for electroda.pl  
    Posts: 4060
    Help: 557
    Rate: 1969
    Too little information.
    Does an error occur?
    Is the fan working?
    Does the fan turn off or run all the time?
    Is the chimney unobstructed? (I'm guessing it's through the wall like almost all in the UK :)
    Does the boiler behave strangely in any way except that there is no spark.
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  • #3 17388941
    roleczka0
    Level 2  
    Posts: 4
    Rate: 6
    Yes, the fan is running, it turns on when the water is turned on. Moments after the water closes, it still spins. Sometimes the flame ignites and there is hot water, sometimes not and only cold. The chimney is rather unobtrusive. I don't know about filters

    Added after 4 [minutes]:

    There is no error (which as you can see in the pictures) there is no electronic display. It doesn't make any sounds or act differently. Only problem with igniting the flame. Sometimes it surprises and sometimes it doesn't
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  • #4 17389446
    piracik
    VIP Meritorious for electroda.pl  
    Posts: 4060
    Help: 557
    Rate: 1969
    The problem may be in the pressure switch on the fan or in the venturi tube.
    The heat exchanger may also be too dirty.
  • #5 17392796
    roleczka0
    Level 2  
    Posts: 4
    Rate: 6
    The house is currently in Pisz, is it possible for someone to come and check this stove?
  • #6 17907170
    pijacko
    Level 11  
    Posts: 8
    Rate: 7
    Did you manage to fix it, what was the cause, and I have a similar problem.
  • #7 18376534
    gregor-siwy
    Level 1  
    Posts: 1
    Rate: 2
    Hello, does anyone have such a stove for sale because I need for a few parts
    greetings and waiting for info 501787843
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  • #8 18877247
    roleczka0
    Level 2  
    Posts: 4
    Rate: 6
    You need to set the heating to III and to 1 not to auto. Must have heating power. For me, when I unscrew the settings panel (from the inside), sometimes when I move the cables, it works for some time. All the time the essence lies in the spark. Sometimes it will come on and light up, sometimes it won't. Last year I fixed the cables and it worked until the end of the season. After winter, for a few days the spark calmly ignited, and now the same thing again.
    Intermittent Spark Ignition in Worcester 24i RSF-L Combi Stove: Possible Causes Intermittent Spark Ignition in Worcester 24i RSF-L Combi Stove: Possible Causes
  • #9 19664985
    Dzaba17
    Level 1  
    Posts: 1
    Rate: 1
    Hello
    I am looking for a motherboard for the Worcester 24i RSF-L Combi boiler. Does anyone have one for sale or would like to sell one? Thank you in advance for your answer.
  • #10 20836866
    ewabartecz
    Level 1  
    Posts: 1

    Good morning, I have a problem with the Worcester LP20RF furnace. The stove is very noisy, gurgling, and the reset button turns on (it lights up red and blinks). After pressing the reset button, it turns off, the stove works for some time, and the story repeats itself. When the reset flashes, the stove is not working. Please give me some tips.
  • #11 20855748
    annesophiemarie
    Level 1  
    Posts: 1
    Rate: 1

    Since this is the only thread I have found online about the Worcester 241 RSF-L, I was wondering if anyone out here knew how to reset the boiler / restart the pilot light? No ignition since this morning although all was well up to this point. Thanks in advance!
  • #12 20857167
    serwisszulborski.pl
    Heating systems specialist  
    Posts: 1844
    Help: 360
    Rate: 1441
    From what I remember the reset may be on the top left (push in STB type fuse) but it may be different on each model depends on the Country where it was assembled.
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Topic summary

✨ The discussion revolves around intermittent spark ignition issues in the Worcester 24i RSF-L Combi stove. The user reports that the stove sometimes ignites and sometimes does not, despite the fan operating normally and no error messages being displayed. Possible causes suggested include a malfunctioning pressure switch, issues with the venturi tube, or a dirty heat exchanger. Other users inquire about similar problems and seek parts or solutions, indicating a broader concern with the model. Additionally, there are requests for assistance in locating replacement parts and troubleshooting tips for related models.
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FAQ

TL;DR: For Worcester 24i RSF-L intermittent ignition, 3 likely culprits. "The problem may be in the pressure switch...or the venturi tube." Check the heat exchanger, too. Reset via the STB if fitted. [Elektroda, piracik, post #17389446]

Why it matters: This FAQ helps Worcester 24i RSF‑L owners and DIY caretakers triage no‑ignite/hot‑water issues fast and talk clearly with a technician.

Quick Facts

What causes intermittent spark on a Worcester 24i RSF‑L?

Three common culprits are cited: the fan pressure switch, the venturi tube, and a dirty heat exchanger. These issues interrupt air‑proving or flame start. Cleanliness and clear tubing matter. “The problem may be in the pressure switch...or the venturi tube.” Start checks there before replacing parts. [Elektroda, piracik, post #17389446]

Does the 24i RSF‑L show error codes or have a digital display?

No. This model has no electronic display, so you won’t see error codes. Diagnose by symptoms such as fan behavior, spark presence, and whether the flame lights. Note what changes when you open or close a hot tap. Record these observations for a technician. [Elektroda, roleczka0, post #17388941]

How should the fan behave when I open and close a hot tap?

Users report the fan starts when hot water is demanded. After closing the tap, it keeps spinning for a short time. That spin‑down period is expected on many fan‑assisted appliances. Use this as a baseline when checking airflow/pressure proving. [Elektroda, roleczka0, post #17388941]

How do I reset or restart ignition on a 24i RSF‑L?

If fitted, press the manual reset (STB) button. Some variants place a push‑in STB at the top‑left. Press once and wait for the boiler to restart its sequence. The exact location can differ by country assembly. [Elektroda, serwisszulborski.pl, post #20857167]

Where is the reset/STB button located on this boiler?

On certain 24i RSF‑L variants, the reset is a push‑in STB located at the top‑left. Other builds may place it differently. Look for a small manual reset near the controls or heat exchanger area. Position varies with country of assembly. [Elektroda, serwisszulborski.pl, post #20857167]

How can I quickly check the pressure switch or venturi path?

Start with basic, safe checks: 1) Isolate power/gas, remove the cover, and inspect the venturi/pressure switch tubing for splits or blockages. 2) Reseat electrical connectors and ensure hoses are snug on the fan and switch. 3) Restore power and run hot water to observe ignition. These focus on the cited fault path. [Elektroda, piracik, post #17389446]

Can control settings help hot‑water ignition if the spark is flaky?

Yes. A user restored ignition by setting heating to III and to 1 (not Auto). This ensured heating power was available during hot‑water calls. Use it as a temporary workaround while you fix the root cause. [Elektroda, roleczka0, post #18877247]

Could wiring harness or control‑panel connections cause intermittent sparking?

Yes. The OP reported the spark returned after moving or securing the internal cables. The boiler then worked for the season and failed again after winter. Reseating the wiring harness can temporarily restore ignition. [Elektroda, roleczka0, post #18877247]

Did anyone in this thread resolve the issue? What worked?

The OP improved reliability by setting heating to III and 1, then securing the panel wiring. Ignition stabilized for the rest of the season. After winter, the intermittent spark returned, indicating a recurring connection or control issue. [Elektroda, roleczka0, post #18877247]

Does a blocked flue/chimney affect ignition on this boiler?

Yes, airflow matters. A contributor asked about flue obstruction when diagnosing no‑spark. Many units vent through a wall in the UK. Confirm the flue path is unobstructed before diving deeper into components. [Elektroda, piracik, post #17388138]

The fan keeps running after I close the tap—should I worry?

Brief fan run‑on after hot‑water use has been observed by users. This behavior can occur as the unit completes a post‑demand cycle. If the fan runs constantly with no demand, that’s different and needs a check. [Elektroda, roleczka0, post #17388941]

Where can I find parts like a motherboard or donor 24i RSF‑L?

Owners search for spares and donor boards on forums and classifieds. Consider used parts from decommissioned units or local repair networks. Post your exact model and needs to improve match chances. [Elektroda, Dzaba17, post #19664985]

How do I ask for onsite help (e.g., in Pisz)?

Share your location, model (Worcester 24i RSF‑L), symptoms, and any photos. Ask for local service in your post title and body. Technicians nearby may respond or message you. [Elektroda, roleczka0, post #17392796]
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