picasso heater fan

[Jaydaz]

Hi, can anyone help please? i have a 2006 picasso, the blower has decided it only wants to work on number 4, i've had this issue with other cars and it's always been the heater resistor so i fitted a new one but the problem is still the same, also the fan only works (on 4) when the engine is running but not when just the ignition is on, what would be my next thing to check now that i've replaced the resistor? any help appreciated