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Hi my trusty .. combi boiler has a couple of issues The automatic air vent on top of the heat exchanger is leaking water occasionally If they leak water do they also risk sucking air into the boiler .Is this an easy thing to replace on this model of heater .any suggestions for replacements...

1) Boiler make / model (gas or oil) ideal Response 80 2) What is / is not happening. when the hot water tap is on the system starts for up as normal it heats the water for 10 secs then the LED 2 lockout lights up water goes cold . putting the CH on produces the same fault. I checked...