Home › Forums › General › gas water heater code f13 General gas water heater code f13 Posted by speedyjack on July 26, 2023 at 3:30 am error code f13 on gas water heater fixbear replied 9 months, 2 weeks ago 3 Members · 2 Replies 2 Replies Tito Administrator July 26, 2023 at 9:50 am Sounds like a fan speed error. We need more information about the unit to verify. fixbear Member July 26, 2023 at 11:48 am Without the make and model, we have no idea as to what kind of water heater your referring to. Log In to Reply Log in to reply. Log In Register Public All Members My Connections Only Me PublicAll MembersMy ConnectionsOnly Me Public All Members My Connections Only Me Log In to Reply Start of Discussion 0 of 0 replies June 2018 Now