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[lindnova]

Update.   

I did change the pump as it is 6 years old.  I thought it fixed it for one day but the hammering still happened. 

I started to drain the unit to change door hoses and flush out, but everything was very clean and the water was as clean as when I put it in.  I didn't change all the water.  I have always kept up on the chemicals, so a restriction on the door hoses isn't it either.

One of the last days I was burning this spring the fan went out.  The bearings were nearly seized and would barely turn by hand.  When I put a new one in, it did not hammer once even though it was warmer out.  I don't think the air was being distributed throughout the firebox and the slower stream of air was concentrated only at the front.  I only ran it 3 days after changing the fan, so hopefully all will be well come fall.