Vacuum Switch- Ardisam/Serenity Castle HPS10/ HPS10IC - 28664 replaces 720238 & 720073

Vacuum switch for Ardisam Castle HPS10, HPS10IC, and Serenity wood pellet stove. Part # 28664 replaces 720073 & 720238. Ardisam recently changed their OEM vacuum switch from the old style white with a clear plastic top to the standard gray and black switch as shown at right. The new switch will not mount the same way as the origninal. The vacuum  switch is a safety switch that shuts the pellet stove down if the combustion (Exhaust) blower fails. If your pellet stove starts up then stops feeding pellets after the start cycle is over, then the vacuum switch is bad or the vacuum line is clogged with ash.  Also, if the auger motor does not turn you may have a bad vacuum switch.