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Potterton gold 24he. Changed DV, actuator motor, magnetic flow switch & descaled secondary heat change. What else could it be!?!? Before doing this shower was just getting hot and cold. Thanks in advance
 
Time to get a gas safe engy out
 
Agree
Sorry bud but sounds like you are throwing money at it not to mention the safety aspect of working with gas. Sometimes these things are best left alone.
 
Try to isolate the shower it may be passing if that’s fine then try to isolating any mixer taps as they could be passing.

I doubt there is any issues with the boiler it may be a mixer tap in the house causing the issue.
 

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