RTB 50 Pellet Boiler secondary board Component identification on board

  • Active since 1995, Hearth.com is THE place on the internet for free information and advice about wood stoves, pellet stoves and other energy saving equipment.

    We strive to provide opinions, articles, discussions and history related to Hearth Products and in a more general sense, energy issues.

    We promote the EFFICIENT, RESPONSIBLE, CLEAN and SAFE use of all fuels, whether renewable or fossil.


New Member
Nov 23, 2023
I have a rtb 50 pellt boiler. wire came off solenoid and found that wire had bare spot on it after i put connector back on 120v. heard a pop on board.
Fuse was fine but this component was damaged and I think it might have been a resistor or varistor. I cant seem to find any info on these boards or someone who has one. If its resistor I am looking for the value if someone could measure it. I have R7 version boards. This might be a surge device as well. its a simple fix for me if i could find out what it is and its value.


  • RTB-Manual-V7-ENG-07.04.16 (1)_14.pdf
    508.2 KB · Views: 29