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Thread: Probe 0 always reads 60

  1. #1
    New Member
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    Probe 0 always reads 60

    Hi, I just finished building my TC HM 4.3 and my Probe 0 is always bouncing between 60-62 degrees, even with no TC attached. When I attach the TC, there's no change in temp. I even de-soldered my TC and still got the same readings. Any ideas? I'm at a loss...




  2. #2
    TVWBB Diamond Member
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    Did you set Probe 0 type to Thermocouple in the HM config?
    I created the Roto Damper, RD3, HMv4.2 sliding back case, "air-burner" and the "ping-pong" valve in my quest for delicious "set and forget" BBQ.

  3. #3
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    Yes I did.

  4. #4
    TVWBB Diamond Member
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    When I zoom in it gets a bit blurry and has a somewhat indirect viewpoint, looks like the 0.1u capacitor below the TC amp IC has something odd going on, might want to check that.

    Below is a chart I made to troubleshoot the TC circuit on the aux thermocouple board, the part locations are different but the components are mainly the same as the board you are working on. The board below has a couple extra parts for a reference offset adjustment but should still be helpful to check for shorts between adjacent IC legs and connection to the other components.

    Last edited by RalphTrimble; 03-31-2018 at 01:29 PM.
    I created the Roto Damper, RD3, HMv4.2 sliding back case, "air-burner" and the "ping-pong" valve in my quest for delicious "set and forget" BBQ.

  5. #5
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    Thanks for the response, I will start there!

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