I installed my recently purchased refurbished harman p61 pellet stove. I ran it last night prior to having the fresh air kit hooked up as I was missing a couple pieces. I set it to temp mode 70 and it fired up and ran for 15-20 minutes and shut off. I assumed this was because the room was above 70? Since it shut down I left it off for the night as I wanted to get the fresh air hooked up. I got that hooked up today and just fired it up again and it ran for 15-20 minutes and seems to have shut down again. Only the combustion blower is running. Nothing else. Is this common in temp mode? Is something wrong? I didn’t anticipate it would shut off so frequently. I haven’t seen any status flashing lights. Is there something going on?