If you are talking about the Honwywell R7284 series-
• Soft Lockout: Caused by a temporary internal error
such as low voltage. The control recovers
automatically after the error is no longer detected.
• Hard Lockout: Caused by a failure internal to the
control or by a system fault such as flame out of
sequence. A Hard Lockout will result in a no heat
condition. To reset from Hard Lockout press and hold
the “i” button for 2 seconds.
• Restricted Lockout: Caused by a number of
consecutive hard lockouts on the same heat cycle. To
reset from a Restricted Lockout press and hold the “i”
button for ten seconds.
Here is a link to the Installation Manual -
http://s3.pexsupply.com/manuals/1281..._PROD_FILE.pdf