Troubleshooting Notes
Over time, the vacuum hose can dry out. This commonly happens at the ends of the hose where it connects to the pressure switch and the port on the stove. When there is an air leak in the hose, the pressure switch contacts can open causing an error code.
Normally the hose is longer than needed. If this is the case on your unit, you may be able to trim the ends of the hose to remove the rotted sections and reattach it between the switch and the port. If this does not solve the problem, make sure your venting is clear of any obstructions and verify that the combustion blower is spinning. If both items mentioned are as they should be, the vacuum switch may need to be replaced.
Quadra-Fire Note: The vacuum switch is located on the right side of the appliance under the feed motor behind right side panel and connects to the drop tube with a hose.