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No heat, customer has to reset furnace every 20 minutes, found system running upon arrival, heater wen off on ignition, lockout down flow furnace, heater has high limit switch inside blower compartment that is in series with gas valve, that limit open up after furnace is running over 20 minutes and resets itself after Cools down, check all return and supply vents, system has three returns one of the, was blocked with tape, removed Tape. System will continue to go off on high temp limit. Would recommend system replacement, explained to customer about making returns grill bigger, customer will make the opening bigger and installed bigger return grills, this will increase more airflow back into system.