Regular Boiler - CH OK but water only gets tepid

Thanks JohnD. I used Fernox F3. I'll try and figure out how to draw a bucket of water from the drain then...
 
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If you just poured F3 into the F&E, it will stay there and not get to where it's needed down in the system. I lower the water level to a little below the F&E using the drain off cock and get a funnel with thin piece of hose attached. Then push hose into exit hole at bottom of F&E as far as I can, then pour the treatment into the funnel. Then turn on supply to F&E float valve and let it fill.

Microversions can get blocked, but they can also sometimes get airlocked. Should be some air vents above the microversion to release air.
 

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