switched back to oil and lost heat, what happened?

All the wood is gone so I had to switch back to burning the oil furnace. I have three zones The second floor seems to be ok but I keep that at 62 new addition is cool but that has been an issue with baseboard sizeing for the square footage. The main part of the house is set at 70 and the temp this am was 52. hi-lo on the furnace is 170-185 I changed the aquastat on the boiler from 150 when buring wood to 170. I have line voltage taco circulators they seem to be working - I'm cold and confused at this point, any thoughts?

I have a concern that it may be air but it just seems to be one zone and sometimes the return is warm and at other times it's not, I made some adjustments in the wee hours last night still cold this am.

To Maine, two zones the pipes are pretty uniform for temp. the problem zone has been hot and cold and varying degrees of warm.

Well back to normal and here is the lesson learned 1. write down the equipment settings -I adjusted the clamp on aquastat to match the high limit on the furnace, i incorrectly had it at the low limit. 2.Had air in the zone at issue, I don't know why shutting down the wood boiler ( and closing the associated gate valves ) would allow air in but after purging the zone it's fine. 3. Don't mess with things you know nothing about. While waiting for a friend to show up to help with the purge I let air out of the expansion tank which let water in which raised the water pressure needless to say I'll call for service to make sure I did no harm. Stick to what you know I guess but thanks for the help, you can bet I won't run out of wood when it's 7 degrees out.