This is the official OEM Harman Pellet Stove ESP Probe Kit (also known as the exhaust thermistor probe). There are 2 different thermistor ESP probes for the Harman line; one has a black wire, one has a red wire. You must order the same color thermistor probe as the one that came with your stove. This is the genuine replacement probe from Harman – this is not an after-market copy.
Harman Part Number: 3-20-11744
Part Description: Harman ESP Probe Kit – Black wire
How Do I Know This Part Needs Replacing?
If your stove has a three (3) blink error code – this often means that the control board has not detected the ESP (Exhaust Sensing Probe) upon 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 the probe itself looks “bent” it’s probably not working (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.
About Harman: HHT is the manufacturer for a number of brands of fireplaces including Harman, Quadrafire, Heat n Glo & Heatilator.
This genuine Harman 3-20-11744 ESP Probe is in stock ready to ship.