Skip to main content
Skip to main content
Product title:

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

Product rating:
Product price:
$89.99
Product SKU ! 3-20-00844
Product MPN ! 3-20-00844
Product availability: In Stock
Bullet point features

Frequently Bought Together

Total Price: $124.98

Description

This version of the ESP is the correct part for any model made after 2008. This updated ESP has red wires, as opposed to the previous probes which could have had black, yellow, or white wires. New Circuit boards are now sensing the condition of the differential pressure switch. (FIG 4) 

Notes for ordering replacement parts:

  • If you need a new probe: Order to match your existing probe. Red= #3-20-00844
  • Black, White, or Yellow Probe: Order the black Probe.
  • If you need a new board: Order using the part numbers included here.
  • If installing on a unit with an old probe = Dipswitch #5 “OFF”.
  • With new probe= Dipswitch #5 “ON”.
  • The DVC500 uses two probes, ESP and TCP(temperature control probe). They must be of the same color

This red ESP is used on all models manufactured after 2008 or any model in the list below with an updated controller:


Replacement For Part Number:

  • 3-20-00844

View Compatible Models

UPC: 652174715022

Compatible Models

    Harman

  • Absolute 43
  • Absolute 43-C
  • Absolute 63
  • Accentra 52i
  • Accentra 52i TC
  • Accentra Cast FS
  • Accentra Insert (Post: 008241201)
  • Advance (Post: 008360001)
  • Allure 50
  • Allure 50-CE
  • DVC 500 (Post: 008065076)
  • HF60
  • Invincible Insert
  • Invincible RS
  • P35i
  • P35i-C
  • P38
  • P38+ (Post: 008190059)
  • P43
  • P43-C
  • P61-A (Post: 008085055)
  • P61-C
  • P61A (Post: 008085803)
  • P68 (Post: 008281295)
  • P68-C
  • PB105
  • PC45 (Post: 008055031)
  • PF100
  • PF120
  • XXV (Post: 008200828)
  • XXV TC

Technical Specs

High Temp Limit 572°F

Instructions

Install 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

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!

HOLIDAY UPDATE
Due to the upcoming Christmas and New Years holidays, shippers will not be picking up on the dates below. Additionally, packages may take longer to arrive than expected. We appreciate your understanding and patience during this time.

  • USPS: No pickup on Dec 24th, Dec 25th, and Jan 1st.
  • UPS: No pickup on Dec 24th (except NDA and 2nd Day), Dec 25th, Dec 31st (except NDA and 2nd Day), and Jan 1st.
CANADA UPDATE

Due to the ongoing Canada Post postal workers' strike, we are forced to suspend all ordering to Canada. Please be advised that any shipments that did not clear U.S. customs by November 15th will be delayed until Canada Post is fully operational. We appreciate your understanding and patience during this time.

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 $49 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

This version of the ESP is the correct part for any model made after 2008. This updated ESP has red wires, as opposed to the previous probes which could have had black, yellow, or white wires. New Circuit boards are now sensing the condition of the differential pressure switch. (FIG 4) 

Notes for ordering replacement parts:

  • If you need a new probe: Order to match your existing probe. Red= #3-20-00844
  • Black, White, or Yellow Probe: Order the black Probe.
  • If you need a new board: Order using the part numbers included here.
  • If installing on a unit with an old probe = Dipswitch #5 “OFF”.
  • With new probe= Dipswitch #5 “ON”.
  • The DVC500 uses two probes, ESP and TCP(temperature control probe). They must be of the same color

This red ESP is used on all models manufactured after 2008 or any model in the list below with an updated controller:


Replacement For Part Number:

  • 3-20-00844

View Compatible Models

UPC: 652174715022

Compatible Models

    Harman

  • Absolute 43
  • Absolute 43-C
  • Absolute 63
  • Accentra 52i
  • Accentra 52i TC
  • Accentra Cast FS
  • Accentra Insert (Post: 008241201)
  • Advance (Post: 008360001)
  • Allure 50
  • Allure 50-CE
  • DVC 500 (Post: 008065076)
  • HF60
  • Invincible Insert
  • Invincible RS
  • P35i
  • P35i-C
  • P38
  • P38+ (Post: 008190059)
  • P43
  • P43-C
  • P61-A (Post: 008085055)
  • P61-C
  • P61A (Post: 008085803)
  • P68 (Post: 008281295)
  • P68-C
  • PB105
  • PC45 (Post: 008055031)
  • PF100
  • PF120
  • XXV (Post: 008200828)
  • XXV TC

Technical Specs

High Temp Limit 572°F

Instructions

Install 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

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!

HOLIDAY UPDATE
Due to the upcoming Christmas and New Years holidays, shippers will not be picking up on the dates below. Additionally, packages may take longer to arrive than expected. We appreciate your understanding and patience during this time.

  • USPS: No pickup on Dec 24th, Dec 25th, and Jan 1st.
  • UPS: No pickup on Dec 24th (except NDA and 2nd Day), Dec 25th, Dec 31st (except NDA and 2nd Day), and Jan 1st.
CANADA UPDATE

Due to the ongoing Canada Post postal workers' strike, we are forced to suspend all ordering to Canada. Please be advised that any shipments that did not clear U.S. customs by November 15th will be delayed until Canada Post is fully operational. We appreciate your understanding and patience during this time.

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 $49 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 6 reviews
100%
(6)
0%
(0)
0%
(0)
0%
(0)
0%
(0)
D
Derek
Fixed problem

Stove wasn’t shutting off when the temp was turned down. This fixed the issue.

C
Christopher O.
Quick and accurate

I got what I needed and I got it quickly, great job

W
William T.
Awesome!

Solved the problem!

A
Anonymous
ESP Probe

Fits as expected, works as expected

A
Anonymous
Control Board

Control board shipped fast , installed and stove is purring like a kitten.

12

QUESTIONS & ANSWERS

If your question does not concern this specific product, use our contact form
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.

Customer Reviews

Based on 6 reviews
100%
(6)
0%
(0)
0%
(0)
0%
(0)
0%
(0)
D
Derek
Fixed problem

Stove wasn’t shutting off when the temp was turned down. This fixed the issue.

C
Christopher O.
Quick and accurate

I got what I needed and I got it quickly, great job

W
William T.
Awesome!

Solved the problem!

A
Anonymous
ESP Probe

Fits as expected, works as expected

A
Anonymous
Control Board

Control board shipped fast , installed and stove is purring like a kitten.

12
Liquid error (layout/theme line 255): Could not find asset snippets/iStock-notify-me.liquid