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  • Hobart DN97 cook and hold

    Posted by emeyer406 on January 28, 2020 at 2:59 pm

      oven would only heat to 200 ish degrees. I put in a  new thermostat (retrofit. old one no long available). It is not responding to  10k ohm set pot.  Upon closer inspection I noticed a broken 750k ohm resister soldered to the outside legs of the old cook set pot (not the wiper). No wiring diagram available. anyone worked on one of these that might be able to help me figure out what the correct ohm needed for the temp control board. I have pictures if it would help.

    emeyer406 replied 4 years, 2 months ago 3 Members · 4 Replies
  • 4 Replies
  • fixbear

    Member
    January 28, 2020 at 3:51 pm

    That’s one old convection  oven  !986 design with the last revision of 94. What was the resistance of the old pot?  A 750 ohm across the outer two Is probably a bleed. The center tap is the variable resistance.  But potenciomerters may look alike but have different ohm ratings.

    Before going into the control did you check the contactor to see if there was a call for heat or not. You could have a open element or contactor pole so that it can’t make enough BTU’s to go over 200.

    • emeyer406

      Member
      January 28, 2020 at 5:25 pm

      The unit had a 10k ohm set pot that had a 750k resister soldered to it.  I replaced the thermocouple thinking it might have been faulty, then changed the temp control board cause the relay on it was shorting out.  the new retrofit kit is newer but different layout.  i have a 10k ohm set pot but we don’t mess with resisters enough to stock any.  im just not getting any response from  broad to turn on the contactor / relay. there is a manual adjuster on the board i can move and the board will close the circuit and the unit will start to heat but i can not get it to respond from the set pot.

  • olivero

    Member
    January 28, 2020 at 4:24 pm

    If the resistor was a broken solder joint, why not just solder it back on? It’s most likely not going to be bad, if you could tell the color rings on the resistor, it didn’t glow and burn up, so it’s probably still good.

    • emeyer406

      Member
      January 28, 2020 at 5:15 pm

      sorry. the resister was broken at the lead end and is no longer long enough to solder back on. I did test it and it is indeed still good, just not reusable. 

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