Hot Water problem

[Razmatazz]

Hi everyone
i have problem with my baxi 105e instant.
When i turn on the hot water fully, the hot water is coming fine, no problem. But when i turn the hot water on half way or slow it down. I get hot water for 20 to 30 second and then get cold. And when i turn the tap open fully i start to get the hot water again. Could you help me to diagnose it please.

 

[bengasman]

Dodgy flowswitch.

 

[Razmatazz]

Thank you for your reply
could be more specific. You mean is it the DIVERTER FLOWSWITCH VALVE. Or is it the DHW DIAPHRAGM

 

[bengasman]

Whatever contraption on this model tells the boiler it needs to fire because a tap is open would be the suspect. Various methods of doing it, don't know by heart how yours does it.

 

[kevplumb]

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