Home has forced hot water heating system via hot water furnace.

Contractor installed 200 gallon hot water storage tank (7 daughters) and (1) new circulating pump and zone to operate the new hot water storage system.

The two original forced hot water heating zones, first floor, second floor used to worked independantly, but now work together.

If the upstairs thermostat calls for heat at 72 degrees, and the downstairs thermostat calls for heat at 60 degrees both heating zones come on at the same time.

Massachusetts' heating code calls for flu monitor and vent fan to be wired to each zone to insure proper exhaust venting.

I called a HVAC to fix system but he could not figure the wiring out and has not returned.

HELP!

MLT Hand