Trying to avoid a pointless $150 service call by summoning the wrong professional. 45 year old house with a 15 year old furnace. Furnace will come on and heat the house to the asked-for temperature, cycle off as usual, but when the thermostat asks for it to kick back on the fuse trips at the box. You can the recycle breaker and it will fire back up, rinse and repeat. HVAC or electrician?