wilfsdad1965
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i have owned this takagi for 4 years. i clean the filters out once a year. i have the remote panel. today during a bad storm, it suddenly fires up for no reason (no water usage) beeps and gives error code 21. this code is not in the manual. i was wondering if i'm getting water coming in from the exhaust valve (it's a side wall exhaust not straight up). it's only happened today during this really big storm when lots of rain is hitting the outside exhaust.