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Troubleshooting a Friday Afternoon Boiler Service Call Without a Diagram

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RayWohlfarth
RayWohlfarth Member Posts: 2,005
edited May 1 in THE MAIN WALL

In this week's video, I talk about how to electrically troubleshoot a friday afternoon no heat boiler call without an electrical diagram.

https://www.youtube.com/watch?v=N27uW7dAeIU
Ray Wohlfarth
Boiler Lessons
109A_5

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  • 109A_5
    109A_5 Member Posts: 4,132

    Is this really what you meant to show at 2:30 ? Wouldn't you want to measure the voltage across the thermostat and its wiring (terminals 1 to 2) ? If the thermostat (or its wiring) was open there would be 24 VAC as you show.

    image.png
    National - U.S. Gas Boiler 45+ Years Old
    Steam 300 SQ. FT. - EDR 347
    One Pipe System
  • RayWohlfarth
    RayWohlfarth Member Posts: 2,005

    @109A_5 Thanks for watching and the question. I was showing that if there is power on terminal 2, it means the thermostat was closed and calling for heat.

    Ray Wohlfarth
    Boiler Lessons

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