EO5 is a stack flue error. exhaust temp is too high. problem can be from several things. bad stack flue sensor. check resistance of stack flue sensor. it should be around 3.8. check thermal regulator, internal bypass, and heath exchanger for any blockage or calcification
If you are firing, and then going off and getting an E05, your igniter is to blame. It may be glowing but it's getting weak. The diagnostic goes further but that is usually the fix. with inactivity, the igniter is always to blame. You really need to fire it off weekly to make it reliable.
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