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Good evening. I am Kevin, I'm going to try to help you.
your getting an "air filter blocked" code?
is the heater working properly other than the "clean filter light"?
ok, let me see if there is a manual reset for that light or timer circuit.
the only thing I am seeing from lennox manuals are that the filter needs to be cleaned. I do not see a reset, so there may be a air flow switch or sensor that may be defective or not activating that would send this message to the board. If you want I could research it more. but more likely than not it's a bad sensor or air flow switch. If you have plenty of heat, and as ALWAYS: HAVE A CO AND SMOKE DETECTOR in the home, and they are current and working, then I'm sure you are fine. If you want to eliminate that error code, we could investigate further, but it will require more time. I would have to research a little, I might not be able to get back to you till Monday, it will cost additional cost and may get the same answer I am giving you now.
No, that was my mis hap,.... put lennox in there and meant to say Rannai. I work on so many and read so many schematics. If you would like I could send you a troubleshooting chart for your heater...?
here is the link.