I found my filters online (FILXXFNC0021). They were ~$57 for two and were Carrier filters. I was told and the manual says they should be replaced every 6 months. It appears you haven't been pouring warm water with a bit of anti-bacterial soap in the water down your condensation tube every 6 months either based on your statement.
Munns was our Heating/AC contractor with our new house. Btw.. they wanted close to $50 each for the same filter. In their home orientation you get, they explained much of the things to do and provided in the packet handed to us a discount on our first furnace checkup. I really don't think it is rocket science but for peace of mind I spend the monies to maintain the furnace and its controls.
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