Product review (4 stars): I wished it lasted longer?
My Mt. Vernon AE power supply ignitor/AC connector,  one terminal post went bad.  This connection goes to Control Board 13 ignitor AC input,  I was experiencing a intermittent miss fire.  This was a hard problem to troubleshoot because it was so intermittent.  Once I removed the power supply, it appears that the terminal in question was missing part of the circuit board pad  on the bottom side only 1/4 was there.  Overtime the AMPs required for the ignition took its toll.  I have been able to temporary repair until new one comes in.

Look at page 32 of http://hearthnhome.com/downloads/installManuals/7036_187.pdf.  If white plastic connector looks brown you are experiencing this problem as well and you have unburned pellets in your ash tray.

This should have been caught in production is why I give it three stars.  The unit has work flawlessly for 9 years, should be 20 plus.

To remove power supply lift black tab (center bottom) and pull toward you.  Disconnect connectors.