Replaced thermostat from a Lennox X4147 to a LUx 7 day programmable

by Robert
(Wilmer, Al)

replace the programmable thermostat Lennox X4147 with a Lux 7 day programmable system cools and cuts off at correct temp. When I change to heat the emergency heat always comes on and never allows the heat pump to work. House temp 71 thermostat set at 73 but won't change from emergency heat. Diff in thermostats lennox had a brown wire connection 7 wires new lux only has 8 and two jumper wires Y to W2 and RC to RH