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Logamatic R2107 blowing internal fuse

BPR2107
BPR2107 Member Posts: 3
edited March 2022 in Oil Heating
Logamatic R2107 blew the internal 0.4A fuse. Installed a new one, the R2107 came on, I set the time, showed boiler temp, hot water and outside temp. Everything working fine, yet 15min later it blew the fuse again. In manual mode the burner fires and works. Thoughts?

Comments

  • STEVEusaPA
    STEVEusaPA Member Posts: 6,247
    Well it's obviously either an internal short or something else is shorting out somewhere else in the system. Time to be a detective.
    I'd use a Short-Pro Tool or equivalent in place of the fuse, and turn it back on and start your troubleshooting.
    Manual mode makes me think something more related to low voltage wiring.
    steve
  • BPR2107
    BPR2107 Member Posts: 3
    edited March 2022
    Thanks. Since the sensors: hot water, outside temp, boiler temp where shown on the display, was thinking it is not a short in these.
  • GW
    GW Member Posts: 4,609
    Sensors are ohm readings, not able to blow fuses. I vote it’s a line voltage issue. Did a pump kick on and blow the fuse? Popper Fuse is my go to in these situations 
    Gary Wilson
    Wilson Services, Inc
    Northampton, MA
    [email protected]
  • pecmsg
    pecmsg Member Posts: 4,191
    BPR2107 said:
    Thanks. Since the sensors: hot water, outside temp, boiler temp was thinking it is not a short in these.
    You really need someone on site to troubleshoot. 
  • TAG
    TAG Member Posts: 751
    GW said:

    Sensors are ohm readings, not able to blow fuses. I vote it’s a line voltage issue. Did a pump kick on and blow the fuse? Popper Fuse is my go to in these situations 

    That's a good idea ..... do you just replace -- or just for testing?
  • BPR2107
    BPR2107 Member Posts: 3
    edited March 2022
    Does anyone know the correct resistance across the low voltage connects 1 and 2 for blue FA (outdoor sensor). Mine is 35.27K ohms without any wires connected (so no sensor connected). I tried Buderus technical support and they were not able to provide an answer.

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