Boiler blower comes on when I hit the override but not otherwise.
Zone controls are calling for heat but blower won't start.
Can I fix myself?

Override? Do you mean the thermostat fan switch?

The override is in a covered part of the controls. Press it and the fan, pilot light, and burners start up.
Release the override switch and it stops.

Brand of unit?

Exact model number of unit?

Honeywell boiler to baseboard heat.
Can find number if needed.
Again, heat is being called for. Unit will come on with override lever depressed.

Yes I will need model numbers and brands. Override is also called reset but I will need to look up exactly what you have.

Dunkirk xeb-5 boiler
Honeywell gas shutoff control

Here is your factory service manual and the Honeywell control manual for your unit.

I see no specific override button but I supplied these so you can track down your problem.

http://www.ecrinternational.com/secure/upload/document/2075.pdf


http://customer.honeywell.com/techlit/pdf/PackedLit/95-6940.pdf