TEch99 is right, but my first question is. Outdoor sensor is it hooked up? If it is do you see the O/R outdoor reset lit up blue? If you look at the User Info Manual page 7 where it shows what the icons are. If the light isn't on and you do not have a ODS it is running default mode with no Parameters set. That should give you min water temp 0f 104*F to 180*F max. Plus what is your return water temp? Press the mode button 3 times and INFO will show up. Look at the A: supply water temp, and B: supply return water temp. While it is running. Also if you look at G: that will also tell you if the Outdoor reset curve is on. A number between 1-7 means it is on.
if it is -- -- -- it means it is off.
Around Sept 28th where I live in NY the night time temp only 68*F. Today right now 39*F according to my info for my ODS. So one way or another if your unit is running. I do not think you should be cycling, with the gas light going on and off. That's if you have your thermostat set to stay on. You should hear it modulating and I believe the gas light should be staying on. That is what mine is doing right now and I took my Nest E taken off Eco which I have set at 65*, and I set it at 71*F. Don't know what type thermostat you have. Also how many zones do you have? If I am wrong about the gas light staying on. Please someone correct me. Because I am just a homeowner and getting use to how my unit is operating. Let alone the Nest Thermostat.
Right now A: 160*F B: between 140 to 149*F, I am set to G:1 for finned tube baseboard. Everything else is set to defaults, except my F: Max Heat capacity for space heating which is at 80%. I think I am still to high on my return water for proper condensing.