Loud train whistle sound when combi kicks on

Loud train whistle sound when combi kicks on

by Don Kreh
(New Britain CT)

Naviien CH210 combination furnace and water heater often makes a train whistle sound for 5 to seconds when it kicks on. 6 foot intake and ventilation pipes exit horizontally from unit. Help the installers have been here twice with no luck! Otherwise system works great! Don

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