How to replace a Baxi 105E microswitch?

[paul_cragg]

Hi
Looking to replace the Baxi 105E microswitch but Worried about getting the white connectors off without damaging the wiring.

has anyone done it and if so is there a trick to getting the connectors off?

 

[paul_cragg]

Have to drain the heating system if your upstairs and above the radiators only need to drain the boiler but if your downstairs need to drain everything above the boiler

Thanks for all your help, so just so I am clear if you are replacing the DHW diaphragm you just need to turn mains off and run tap but if you are changing the CH diaphragm you have to drain the boiler? I will also get some fernox inhibitor when I do drain it down

 

[ShaunCorbs]

Correct and anything above the boiler