My heater will not shut off ,unless I flip the breaker.I put it on cool.. the a/c comes on but it still blows hot... what do I need to replace .or maybe unstick low on funds at the moment thanks in advance its a Nordyne e1eb-015ha in my mobile home..thanks again

Try disconnecting the white thermostat wire at the furnace. If the problem continues you probably need an electric heat relay.