Harman Pellet Stove Control Board Explained

[@g3015867]

My combustion motor wouldn't stop on plug in - found the air leak in minutes after your video. Thanks!

[@PJ_2761]

Very easy to understand, nice job

[@jeffhennings6579]

Best video I’ve seen yet on this

[@jimbay5509]

I wish Harman gave this thorough a tutorial!

[@jbr1644]

Did you ever do the video on installing a wall thermostat for these stoves?

[@wbb5954]

Great video. Very well explained and concise.

[@bubbabaxter64]

Awesome tutorial!

[@BlakeAlpha]

Did you ever make a video showing how to attach a thermostat?

[@digitaldamo]

Just purchased the P68 a few days ago a bit disappointed with the noise of the fan, I thought it would be much quieter. Any tips. Also Thank you for this in depth explanation. Our installer really had no idea on how to use it.

[@101spectre]

Can someone explain distribution Fan settings better? Does a Low to high setting more-or-less change it from a radiant heat to a forced/directed air?

[@SusanGan-nf4dl]

We acquired this stove when we bought our home. When we plug in the stove, the power light illuminates, also, the status light illuminates, and the combustion light illuminates. feed light never comes on. Stove works except it will not auger feed into the stove. We checked auger motor and it is good. Any other thoughts or suggestions for us to look at?

[@anthonyrago2040]

you said most efficient way to run is stove/constant on #6 and very low fan.. we all know stove mode uses the most pellets so at #6 I assume it would go thru pellets even faster.. is this correct?

[@craigwwinter]

Was wondering the same thing. Have you figured out the answer to this?

[@bigtom3422]

Using the Room Sensor, Can you hook up a Digital thermostat to that wire in another room and use it that way?

[@michaelcolford6817]

No, a digital thermostat won't work with this Harman circuit board. The Room Sensor is a thermistor with an approximate value of 4500 ohms. The Room Sensor voltage is only 18 Vac so the available open circuit current to power a digital thermostat is only 4 mA, whereas the thermostat would need at least 20 mA and that is only marginal to say the least. Ideally, there should be 40 mA to operate a digital thermostat reliably. If the digital thermostat is powered by another source, say a battery or separate power supply it might work, but that would need to be figured out on a per thermostat basis. On the other hand a good old mercury thermostat would work fine.

[@BlakeAlpha]

Did you ever make a video showing how to attach a thermostat?

[@captainkangaroo4301]

That control board looks newer than my 2005 P-68 in that it has colors whereas mine is all black and white and mine says room temperature and stove temperature rather than constant burn. And instead of disabled and auto my igniter says manual and auto. This leads me to believe that despite your click bait title this is not really an “old style” control board but an intermediate model. Depending upon the outside temperature I might turn my auger feed rate all the way down to one. For example in Minnesota if it’s 30 degrees outside I might have the feed rate set at one to keep my small well insulated house at 70-75 degrees. If it’s negative 15 degrees outside I may well have the feed rate at four. I always leave my stove on room temperature and manual. I generally don’t want it on auto ignite after the fire is lit because if it’s warm enough to not require constant heat I think it’s likely too hard on the igniter to keep relighting the stove. Even if I’m wrong about that I prefer a constant flame because I’m gone to work 14 hours a day and in case of a power outage I don’t want to risk the igniter not working. I do use a Sure Fire 512 pure sine wave inverter with a 12 volt 200 amp Mighty Max deep cycle battery that could run the stove for 12-24 hours in case of a power outage depending upon the temperature outside.

[@chris2790]

By old style I think they mean manual knobs vs touch screen controls.

[@hubster4477]

​​@@chris2790 2023 p series models still have knobs, and they are like the knobs in the video and colored the same.

[@CentralNH]

I thought feed rate was lb per hour in stove temp mode only. I always tell everyone room temp auto is a house furnace mode.

[@Bobcagon]

Harman recommends “The Room Sensor be installed even if only installed on the rear of the unit as a return air sensor”. Just say in.