Baxi 105e combi boiler

[Gregus]

hi there

i have a the baxi 105e combi , the problem i have is no hot water , central heating works fine . The push rod is dosn't come out from the pressure differential valve and engage the microswitch. When i manually push the microswitch it bring the function light on the control panel and appears to be fine
From what i've read it could be the diaphram, i understand you shut the mains water to the boiler off and open the hot tap to drain

Would anyone know if the central heating need draining or is it seperate ?

many thanks

 

[Baxi-Remeha]

no it dosn't.

 

[Gregus]

thanks for your help , hopefully it's just the diaphram