Does the new fan have a timer option? If yes, it might be wrong to assume you can wire it with just your two wires. I recently installed a timered vent axia fan in place of a non timer fan, thinking I could wire it without a permanent live and it would operate like a non timered fan.
I was wrong, the circuitry in the vent axia timer fan required the permanent live to be there in order to work, so what was supposed to be a 30 minute job turned into an all day one digging up my floor boards to find a suitable location to wire off.
Check the wires you've connected to it (with a proper voltage tester, safety first). Are they live? Do they go on and off when the lights go on and off?
Does the new fan have a timer option? If yes, it might be wrong to assume you can wire it with just your two wires. I recently installed a timered vent axia fan in place of a non timer fan, thinking I could wire it without a permanent live and it would operate like a non timered fan.
I was wrong, the circuitry in the vent axia timer fan required the permanent live to be there in order to work, so what was supposed to be a 30 minute job turned into an all day one digging up my floor boards to find a suitable location to wire off.