I have a Digital Raypak 2100 that I am putting back in service after years of offline. Everything works as expected... pilot light, burner and controls. However, the water temperture in the SPA mode never gets above 80 degrees. I can see part of the burner flame and it appears to burn blue, with just a few flecks of sporatic yellow. The flame is not "blowing" above the burner, so gas pressure appears to be OK. The supply pipe is
1 1/4", so the supply should be OK. I can't see if the flame is burning high enough ( I think it is supposed to be 4"). Any ideas that I can check. Thank you.