Quote Originally Posted by OldFogey View Post
If it has a honeywell controller, and it seems like most of them do, be sure to flush the heater every 6 months or so. Once the controller faults and gives you the 5 flashes, you have to replace the controller (~$100 last time I had to do it).
Thanks for the reminder. I used to do it monthly when I changed the furnace filter.
Had the furnace replaced and the new electronic air filter lets me know when it needs to be disassembled, washed, and reinstalled. About every 6-8 months.