Skip to main content
Skip to main content
Product title:

Harman Black Thermistor Exhaust Sensing Probe (ESP): 3-20-11744

Product rating:
Product price:
$129.99
Product SKU ! 3-20-11744
Product MPN ! 3-20-11744
Product availability: In Stock
Bullet point features

Frequently Bought Together

Description

Replacement Harman Black Exhaust Sensing Probe (ESP) for select pellet stoves.

A 3 blink error code means that the control board has not detected the ESP (Exhaust Sensing Probe) at startup or that it lost communication with it while the unit was running.

  • Verify that the ESP probe is clean by removing it and looking at it, clean if necessary. It should be a silver-colored metal.
  • If you replace it, make sure you replace it with the proper one for your unit. There are two versions; a probe with black wires and a probe with red wires, replace accordingly.
  • If the probe itself looks “bent” it’s probably broken.
  • Before replacing the probe verify that the probe itself is actually plugged into the controller and the contacts on the controller are “clean”
  • On the front side of each controller, there is a red rectangle box with a series of 8 micro-switches called DIP switches. The controller must be removed from the unit to access them. DIP switches allow multiple stoves to use the same controller but run different programs according to the stove’s required functions. The #5 DIP switch must be set to “OFF’ or down for ESP probes with black wires and set to “ON” for DIP switches with red wires. 3 blink error codes can be caused by installing the improper colored wired ESP with the wrong DIP selection.

Also compatible With Eco Choice BA100

    Fitment Note: There are multiple colors of ESP probes for Harman stoves. If your stove has a Black, White, or Yellow probe, this black probe is the correct replacement. If you have a Red ESP Probe, you require part 3-20-00844


    Replacement For Part Numbers:

    • 3-20-11744
    • 1-00-00744

    View Compatible Models

    UPC: 652174647279

    Compatible Models

      Harman

    • Accentra Cast FS
    • Accentra Insert (Pre: 008241201)
    • Advance (Pre: 008360001)
    • DVC 500 (Pre: 008065076)
    • Invincible Insert
    • Invincible RS
    • Magnum (44 Mag)
    • P38
    • P38+ (Pre: 008190059)
    • P61-A (Pre: 008085055)
    • P61A (Pre: 008085803)
    • P68 (Pre: 008281295)
    • PB105
    • PC45 (Pre: 008055031)
    • PF100
    • XXV (Pre: 008200828)

    Technical Specs

    Probe Length 2 1/2"
    Wire Length 60"

    Videos

    Instructions

    Install Instructions For Harman Black Thermistor Exhaust Sensing Probe (ESP): 3-20-11744

    You must be careful not to bend an ESP probe if removing it for maintenance purposes. Bending the sheath of the probe will usually ruin the sensor. Likewise, when cleaning your stove, care should be taken to not bend the sensor when cleaning. Do not send brushes or vacuum tools through the stove blindly. Before cleaning your stove for the first time, find the ESP probe and make sure that it is not going to be in the way when cleaning. If it is, remove it from its mount prior to performing work.


    Using a 1/4" socket, remove the mounting screw and remove the thermocouple from the stove. Trace the wires back to the control board and unplug the wires.



    DIP Setting by Stove Model

    Troubleshooting

    The Control Board/ESP combination is responsible for all high limit safety control. There are 2 high limits, one normal operation high limit and one backup high limit. The control has an automatic diagnostic circuit that continuously monitors the ESP and Room Sensor for faults. If a fault should occur, the control sends a status alert and at the same time the unit goes down to minimum feed/ minimum burn as a safety condition.


    In 2008 Harman changed the ESP probe for all units going forward. The change is notable by the color of the ESP wires, Black wires are Pre 2008 and Red Wires are Post 2008. THESE WERE ROLLING CHANGES AS NEW UNITS WERE MADE AND NOT ALL CHANGES HAPPENED JAN 1 2008.


    • For most units, dependent on the controller and/ revision, red thermocouples can be use in place of black thermocouples if the #5 DIP switch settings on the control board are set to 'ON', or 'UP'.


    • Black thermocouples have the #5 DIP switch setting 'OFF', or 'DOWN' however; red thermocouples are slightly larger in diameter than black ones and often will not fit into the mounting holes of black thermocouples on some units.


    • RED ESP wires cannot be cut and spliced.


    • Circuit board revisions ultimately dictate whether a black or red ESP should be used. See the chart below...


    Warranty

    Unfortunately, sometimes products do not work like they are supposed to. We offer a 90 day warranty on manufacturer defects. Some manufacturers make this a very simple and easy process unfortunately others do not. Items must be used in accordance with the manufacturers guidelines to qualify for warranty replacement. Please be advised that warranty claims for these parts may take up to 4 weeks for processing, and customers must cover shipping.

    Shipping Information

    This Item Qualifies For Free Shipping With Orders Over $199!

    When Will My Order Ship?

    All orders are typically processed within 24 hours of receiving payment and are shipped from us same day if placed before our shipping cutoff time (Monday - Friday: 12PM, Saturday: 10AM, Sunday: No Shipping), orders placed after our cutoff time are shipped the next morning.

    Do You Offer Express Shipping?

    Yes! Please note the shipping times are based on business days, weekends and holidays do not count to the delivery date. Please see our expedited ship time schedules here.

    How Does Free Shipping Work?

    Most orders over $199 qualify for free shipping! Orders which ship for free are shipped with either USPS or UPS based on our discretion. If you are using a PO box, free shipping orders will always go USPS.

    Do You Ship To Canada?

    We ship to Canada! We estimate USPS to take 4-10 days once receiving your package from us. We do not offer expedited shipping of any kind to Canada. Please allow an extra 2-5 days for all shipments to Canada. Free shipping is not available to Canada.

    Do You Ship To Alaska Or Hawaii?

    We ship to both Alaska and Hawaii! We do not offer next day or two day shipping to Alaska or Hawaii. Free shipping is not available to Alaska or Hawaii.

    Do You Ship Outside The US Or Canada?

    Unfortunately, at this time we do not offer international shipping other than to Canada.

    Shipping Time Estimations

    For information on shipping time estimations, see the Shipping Information & Transit Times on the shipping page.

    Learn More About Our Shipping Information
    Jump back to product information tab navigation

    Description

    Replacement Harman Black Exhaust Sensing Probe (ESP) for select pellet stoves.

    A 3 blink error code means that the control board has not detected the ESP (Exhaust Sensing Probe) at startup or that it lost communication with it while the unit was running.

    • Verify that the ESP probe is clean by removing it and looking at it, clean if necessary. It should be a silver-colored metal.
    • If you replace it, make sure you replace it with the proper one for your unit. There are two versions; a probe with black wires and a probe with red wires, replace accordingly.
    • If the probe itself looks “bent” it’s probably broken.
    • Before replacing the probe verify that the probe itself is actually plugged into the controller and the contacts on the controller are “clean”
    • On the front side of each controller, there is a red rectangle box with a series of 8 micro-switches called DIP switches. The controller must be removed from the unit to access them. DIP switches allow multiple stoves to use the same controller but run different programs according to the stove’s required functions. The #5 DIP switch must be set to “OFF’ or down for ESP probes with black wires and set to “ON” for DIP switches with red wires. 3 blink error codes can be caused by installing the improper colored wired ESP with the wrong DIP selection.

    Also compatible With Eco Choice BA100

      Fitment Note: There are multiple colors of ESP probes for Harman stoves. If your stove has a Black, White, or Yellow probe, this black probe is the correct replacement. If you have a Red ESP Probe, you require part 3-20-00844


      Replacement For Part Numbers:

      • 3-20-11744
      • 1-00-00744

      View Compatible Models

      UPC: 652174647279

      Compatible Models

        Harman

      • Accentra Cast FS
      • Accentra Insert (Pre: 008241201)
      • Advance (Pre: 008360001)
      • DVC 500 (Pre: 008065076)
      • Invincible Insert
      • Invincible RS
      • Magnum (44 Mag)
      • P38
      • P38+ (Pre: 008190059)
      • P61-A (Pre: 008085055)
      • P61A (Pre: 008085803)
      • P68 (Pre: 008281295)
      • PB105
      • PC45 (Pre: 008055031)
      • PF100
      • XXV (Pre: 008200828)

      Technical Specs

      Probe Length 2 1/2"
      Wire Length 60"

      Video

      Instructions

      Assembly Instructions For Harman Black Thermistor Exhaust Sensing Probe (ESP): 3-20-11744

      You must be careful not to bend an ESP probe if removing it for maintenance purposes. Bending the sheath of the probe will usually ruin the sensor. Likewise, when cleaning your stove, care should be taken to not bend the sensor when cleaning. Do not send brushes or vacuum tools through the stove blindly. Before cleaning your stove for the first time, find the ESP probe and make sure that it is not going to be in the way when cleaning. If it is, remove it from its mount prior to performing work.


      Using a 1/4" socket, remove the mounting screw and remove the thermocouple from the stove. Trace the wires back to the control board and unplug the wires.



      DIP Setting by Stove Model

      Troubleshooting

      The Control Board/ESP combination is responsible for all high limit safety control. There are 2 high limits, one normal operation high limit and one backup high limit. The control has an automatic diagnostic circuit that continuously monitors the ESP and Room Sensor for faults. If a fault should occur, the control sends a status alert and at the same time the unit goes down to minimum feed/ minimum burn as a safety condition.


      In 2008 Harman changed the ESP probe for all units going forward. The change is notable by the color of the ESP wires, Black wires are Pre 2008 and Red Wires are Post 2008. THESE WERE ROLLING CHANGES AS NEW UNITS WERE MADE AND NOT ALL CHANGES HAPPENED JAN 1 2008.


      • For most units, dependent on the controller and/ revision, red thermocouples can be use in place of black thermocouples if the #5 DIP switch settings on the control board are set to 'ON', or 'UP'.


      • Black thermocouples have the #5 DIP switch setting 'OFF', or 'DOWN' however; red thermocouples are slightly larger in diameter than black ones and often will not fit into the mounting holes of black thermocouples on some units.


      • RED ESP wires cannot be cut and spliced.


      • Circuit board revisions ultimately dictate whether a black or red ESP should be used. See the chart below...


      Warranty

      Unfortunately, sometimes products do not work like they are supposed to. We offer a 90 day warranty on manufacturer defects. Some manufacturers make this a very simple and easy process unfortunately others do not. Items must be used in accordance with the manufacturers guidelines to qualify for warranty replacement. Please be advised that warranty claims for these parts may take up to 4 weeks for processing, and customers must cover shipping.

      Shipping Info

      This Item Qualifies For Free Shipping With Orders Over $199!

      When Will My Order Ship?

      All orders are typically processed within 24 hours of receiving payment and are shipped from us same day if placed before our shipping cutoff time (Monday - Friday: 12PM, Saturday: 10AM, Sunday: No Shipping), orders placed after our cutoff time are shipped the next morning.

      Do You Offer Express Shipping?

      Yes! Please note the shipping times are based on business days, weekends and holidays do not count to the delivery date. Please see our expedited ship time schedules here.

      How Does Free Shipping Work?

      Most orders over $199 qualify for free shipping! Orders which ship for free are shipped with either USPS or UPS based on our discretion. If you are using a PO box, free shipping orders will always go USPS.

      Do You Ship To Canada?

      We ship to Canada! We estimate USPS to take 4-10 days once receiving your package from us. We do not offer expedited shipping of any kind to Canada. Please allow an extra 2-5 days for all shipments to Canada. Free shipping is not available to Canada.

      Do You Ship To Alaska Or Hawaii?

      We ship to both Alaska and Hawaii! We do not offer next day or two day shipping to Alaska or Hawaii. Free shipping is not available to Alaska or Hawaii.

      Do You Ship Outside The US Or Canada?

      Unfortunately, at this time we do not offer international shipping other than to Canada.

      Shipping Time Estimations

      For information on shipping time estimations, see the Shipping Information & Transit Times on the shipping page.

      Learn More About Our Shipping Information

      Customer Reviews

      Based on 2 reviews
      100%
      (2)
      0%
      (0)
      0%
      (0)
      0%
      (0)
      0%
      (0)
      W
      William T.
      awesome

      Excellent your people are Always very helpful and knowledgeable!

      E
      Ezio F.
      Thank You

      Fast delivery and good price with discount. Please offer more incentives and I will always comeback. Great place to shop.

      QUESTIONS & ANSWERS

      If your question does not concern this specific product, use our contact form
      Ask a Question
      • I have a harman xxv pellet stove serial number 7233. I starts and works as it should except when I turn it off The flame goes off and goes into the cool down mode but the fan never shuts off. I will let it run for a couple hours unplug it and when I plug it back in the fan doesn't come back on. Do you think I need a esp probe or control board? Thanks

        The stove can take sometimes up to 30 to 45 minutes to shut down. The combustion blower will continue to work until the ESP probe no longer senses heat coming from embers still burning in burn pot.    If the stove's combustion blower is running after all embers are out it may be a false reading from the ESP probe. Make sure that the ESP probe is clean. Use a soft cloth so as not to scratch it. What happens from time to time is that build up of ash will get caked on probe. When the stove is running that build will get heated up and retain the heat longer. This ESP will sense the heat coming from that build up and shut down time will be extended. If after you have cleaned the ESP you still are having the problem then the ESP may be faulty and need to be replaced. If after replacing the ESP you are still having the problem then all signs point to the control board. 

      Customer Reviews

      Based on 2 reviews
      100%
      (2)
      0%
      (0)
      0%
      (0)
      0%
      (0)
      0%
      (0)
      W
      William T.
      awesome

      Excellent your people are Always very helpful and knowledgeable!

      E
      Ezio F.
      Thank You

      Fast delivery and good price with discount. Please offer more incentives and I will always comeback. Great place to shop.