Customer had no heat in kitchen zone, thermostat display blank, went to boiler and tried jumping thermostat wires for that zone and nothing happened, tested for continuity between wire and wasn’t getting a reading, customer just had floors in kitchen done and found thermostat wire had been cut, replaced a 6 foot section of thermostat wire and connected it to existing wiring, thermostat came back on and zone valve opened, let system run until supply and return pipes got hot, system operational and working.