I've been searching the internet to try and figure out why my harmon p61 wont shut off. I just purchased it used last week to replace a fairly cheap pellet stove I had attempted to use to heat my garage. I have a harmon p38 in my home and it is the best investment I've every made, so I sought out another one for the garage. This runs perfect and heats as expected, but I can't get it to shut down. Not being a newbie to the harmon or some of the esp issues it has I figured this was a simple search....Not so much! Here's what I've got. The p61 can have either a micro switch or a vacuum switch. I opened the cover and my stove has both! The micro switch and wires are in there, but not connected to anything, nor can I find anywhere it would plug into on motherboard. The vacuum switch is clearly connected and connected to motherboard. I don't know if motherboard was changed at some point and updated, or if it came this way from the factory and this unit was built mid an update. Since my issue is that it won't turn off, is it possible that the draft motor is set to high? I can only find info on vacuum switch if draft motor is set to low, but not what will happen if to high. When I turn the controls to off it just keeps running on a really slow "idle" mode. I came out to garage this morning and the thing was still running 8 hours later after it was "turned off". Motherboard, vacuum switch, or ESP sensor? I'm thinking no on the ESP...I've replaced many on my p38 over the years and they either work or they don't and the stove won't much of anything at all when they go bad. The controls all seem to work on this one.....except for off. Thanks in advance for any responses!