I have had my harman p 68 pellet stove since 2016, one winters evening our power went out, to keep my family warm, I chose badly and plugged my pellet stove into a portable generator, and that's when things started bad. The generator surged, and blew the circuit board on my pellet stove. It blew the capacitor next to the transformer and the fuse on the circuit board. I ordered a new board off Amazon from a harman dealership expressed shipped. Got new board fingers crossed all was going to work perfect. Installed new board, and pellet stove ran. Awesome, but then I noticed that the room temperature blower was not blowing at max when turned to max, either on stove temp, room temp, or test run. So again got another circuit board, from the dealer I bought the stove from, tried it and same result, stove fires up, runs, but room blower does not operate at full speed. Checked blower motor voltage supply, when put on high room temp or stove temp, and even on test mode, and supply voltage to motor was max 105 volts. The wall voltage is 120, exchanged between both board, and same results, fan is not getting full voltage for full speed operation. So contacted a harman dealership and they recommended that the blower motor be replaced, that sounds like the culprit. With hesitation I decided to order it, why not have a spare. Tried it, and still no full speed. Well start throwing new parts at it, why not, 2 harman boards and same results, what are the chances of having two bad boards. So replaced room temp probe, because the stove this winter started to run got extremely hot, so hot I could smell the steel baking, surrounding walls were hot. Room blower was on max on potentiometer, but still no max speed, and fuel consumption went through the roof, but temperature of room didnt heat as it did when new. Fan still not running full speed. Got new room temperature sensor, and tried it, now not only the fan speed hasn't gotten faster, but now room temperature drops, and pellet stove won't come to life without pushing on room temp potentiometer, or turning it up. What I mean by pushing on the potentiometer, I just barely put pressure on the knob and the stove comes to life. I have the same issue with either board, have it down to a total of 5 minutes to exchange out the boards. I have ordered a new esp probe red wires, ( also with the boards have verified the #5 dip switch is in correct location). I'm getting the esp probe on Friday, but I'm sure from what I've been reading this won't be the problem. At a loss, please could someone give me an insight or idea, just short of replacing the exhaust fan, the feeder motor and the wiring, I don't know what to do.
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