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Laars endurance ebp 175. Help.

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ArchimoreHorie
ArchimoreHorie Member Posts: 27
edited December 2022 in THE MAIN WALL
Hi hi I have a Laars Endurance EBP 175. 
F4 and F2 codes. 
Replace flow temperature sensor. 
Replace high limit sensor. Boiler did work for a couple days.  But now won’t  work. 
LCD read 181. Thanks for any help. 

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  • Ironman
    Ironman Member Posts: 7,385
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    What does the manual say those codes mean?
    Bob Boan
    You can choose to do what you want, but you cannot choose the consequences.
  • ArchimoreHorie
    ArchimoreHorie Member Posts: 27
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    Sorry for the late response. 
    The code say. F4.  Flow temperature sensor faulty. 
    I install a new sensor
  • 109A_5
    109A_5 Member Posts: 1,388
    edited December 2022
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    Hello @ArchimoreHorie,
    Since it is now apparently displaying a temperature, is it "bFt" or "tnt" or "rtt"



    There are "FAULT TREE" flow charts in the manual that may help you. Does the internal pump run ?


    National - U.S. Gas Boiler 45+ Years Old
    Steam 300 SQ. FT. - EDR 347
    One Pipe System
  • ArchimoreHorie
    ArchimoreHorie Member Posts: 27
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    Bft 
  • ArchimoreHorie
    ArchimoreHorie Member Posts: 27
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    Yes the internal pump run
  • 109A_5
    109A_5 Member Posts: 1,388
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    Hello @ArchimoreHorie,
    No more Fault Codes ?
    Not locked out " LO Lock Out - Combustion Related " ?
    Sounds like if it is at " bFt 181 " it does not need to run, the water is at the maximum desired temperature.



    Manual:
    https://www.laars.com/images/uploads/products/1117F.pdf

    National - U.S. Gas Boiler 45+ Years Old
    Steam 300 SQ. FT. - EDR 347
    One Pipe System
  • ArchimoreHorie
    ArchimoreHorie Member Posts: 27
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    Yes I have a F4 codes. Replace the sensor. 
  • ArchimoreHorie
    ArchimoreHorie Member Posts: 27
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    Boiler comes on for about 3 min  then flash F4. 
  • 109A_5
    109A_5 Member Posts: 1,388
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    Hello @ArchimoreHorie,
    Was the wiring and connections for the replaced sensor checked all the way back to the Main PCB. Were any connectors for the sensor re-seated (boiler power disconnected).

    I'm wondering if just the opposite of this is happening,

    That the 'thermostatic union' is stuck closed and the heated water does not leave the boiler or another system pump is not working.
    National - U.S. Gas Boiler 45+ Years Old
    Steam 300 SQ. FT. - EDR 347
    One Pipe System
  • Ironman
    Ironman Member Posts: 7,385
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    The code does NOT say the sensor is at fault, but that there’s a flow sensor fault.

    That could simply mean that sensor is doing its job and not sensing proper flow.

    Is there an inlet screen? If so, has that been checked?
    Bob Boan
    You can choose to do what you want, but you cannot choose the consequences.
  • ArchimoreHorie
    ArchimoreHorie Member Posts: 27
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    The [MC] should indicate a rapid rise in
    temperature to 150° F (1-2 min. duration). During this period the thermostatic union at the flow outlet is closed and the boiler is operating in the internal recirculation mode. [Service note: If the temperature rise is not rapid the union thermostat may be defective and must be
    replaced  

    Will check in the morning. Also the wiring
  • ArchimoreHorie
    ArchimoreHorie Member Posts: 27
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    @Ironman. I don’t know if a screen
  • ArchimoreHorie
    ArchimoreHorie Member Posts: 27
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    Was checking my boiler now.  As soon as it ignites. It goes to 220 and shut off. Any know why. 
  • SuperTech
    SuperTech Member Posts: 2,200
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    It sounds like lack of flow. Plugged inlet screen or pump not functioning. 
  • ArchimoreHorie
    ArchimoreHorie Member Posts: 27
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    I take out the heat chamber and clean it last night.  Run water though it. Water flow ok.  New pump
  • ArchimoreHorie
    ArchimoreHorie Member Posts: 27
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    Update.  New pump I get after one week.  Broken shaft. 
  • 109A_5
    109A_5 Member Posts: 1,388
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    Update.  New pump I get after one week.  Broken shaft. 

    Broken Shaft, WoW !!! Good find.
    National - U.S. Gas Boiler 45+ Years Old
    Steam 300 SQ. FT. - EDR 347
    One Pipe System
    SuperTech