Baxi 105E hot water problems

[Captaincarnage]

Please can anyone offer advice
dhw on baxi 105E sticks on intermittently. When I turn hot tap on hot water fires up no problem. When I turn it off sometimes the boiler continues to fire and won't shut off until I turn the hot water back on and off or turn the cold tap on. I have checked the dhw diaphragm and this is fine. Checked the dhw switch and this is fine. For whatever reason sometimes the pushrod stays out causing the boiler to continue firing even though the tap is off. I have greased the components to make sure they are not sticking but this has not made the difference. Could it be the spring? Sensing pipe? I don't know.
Any ideas would be greatly appreciated.

 

[IDCHAPPY]

Are you Gas Safe Registered?
You do know you aren't supposed to be opening up boilers if you aren't. ....

 

[Dotty]

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