Harman Red Thermister Exhaust Sensing Probe (ESP), 3-20-00844

$74.99
SKU 3-20-00844
MPN 3-20-00844

Description

Harman Red Exhaust Sensing Probe (ESP)

Replacement Red ESP Probe for Harman Stoves. Exhaust sensing Probe RED WIRE, This part is NOT interchangeable with the Black Wire Thermistor Probe. The ESP constantly monitors and adjusts heat output to maintain set room temperatures within 1 degree.

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.

Replacement For Part Number:
  • 3-20-00844

Compatible Models

    Harman
  • Absolute 43
  • Accentra 52i
  • Accentra Freestanding
  • Accentra Insert
  • Advance
  • Allure 50
  • Furnaces And Boilers
  • P35i
  • P43
  • P61A
  • P68
  • XXV
  • Harman stoves
  • 52i
  • Accentra Insert
  • Accentra Stove
  • Advance Stove
  • DVC500
  • HF60
  • P35i Insert
  • P38 P43 Stove
  • P61A Stove
  • P68 Stove
  • PB105
  • PC45
  • PF100
  • XXV

Video

Instructions

Assembly Instructions For Harman Red Thermister Exhaust Sensing Probe (ESP), 3-20-00844

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

Helpful Tips

Red thermocouples can be use in place of black thermocouples if the #5 DIP switch settings on the control board are set to 'ON', black thermocouples have the #5 DIP switch setting 'OFF', however; red thermocouples are slightly larger in diameter than black ones and often will not fit into the mounting holes of black thermocouples.


Thermocouple wires cannot be cut and spliced.


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. 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 $99!

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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.

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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.

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Read More About Our Shipping Information

Please Note: Due to the COVID-19 emergency, USPS and UPS will not guarantee delivery times on next-day and second-day delivery services. Unfortunately, we will not be able to provide a refund for packages shipped this way which are late. Everyone is trying their best under these circumstances. Thank you for your understanding.

Customer Reviews

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ESP Probe
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Probe

QUESTIONS & ANSWERS

Ask a Question
  • I have an Invincible T pellet stove and am looking for a replacement ESP probe. red wire . What part do I need to order .

    The correct ESP for that stove would be the black wire unless you have updated your controller.

  • I have a 35si and p38+/P43. I followed your instructions for cleaning the ESP sensor, but that did not work and need to buy a new one. I wanted to ask you about the quality and longevity of the after market part. It is affordable enough to purchase two but I don't want to replace them every few months. I would probably also purchase a spare sensor for the 35. I am also thinking about purchasing a spare igniter. I have the same question concerning them. Also will the igniter for the P43 work with the P35. It seems that it will, but I want to be certain. I had one last question. When the stove in the basement was installed they put the pipe straight out of the wall. Does the exposed pipe outdoors need to have something on it or turned up for the stove to be more efficient. Thanks for your time and patience Sandor

    I have a 35si and p38+/P43. I followed your instructions for cleaning the ESP sensor, but that did not work and need to buy a new one. I wanted to ask you about the quality and longevity of the after market part. It is affordable enough to purchase two but I don't want to replace them every few months. I would probably also purchase a spare sensor for the 35. I am also thinking about purchasing a spare igniter. I have the same question concerning them. Also will the igniter for the P43 work with the P35. It seems that it will, but I want to be certain. I had one last question. When the stove in the basement was installed they put the pipe straight out of the wall. Does the exposed pipe outdoors need to have something on it or turned up for the stove to be more efficient. Thanks for your time and patience Sandor The aftermarket ESP probe is identical to the OEM. The igniter for the P43 and the P35I are the same. Harman recommends at least 5 feet of vertical in every installation. The rule of thumb for horizontal runs of venting are this: 1. Horizontal runs of venting shall rise 1/4" over each foot of span. 2. for each foot of horizontal span venting shall be proceeded by two feet of vertical rise. 

  • Can the pp38 super have a exterior therastat?

    No, since the Harman PP38 is a manual ignite pellet stove the stove will have no way to turn back on when the thermostat indicates heat is needed to achieve the requested heat.

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