Baxi [E.04.13] fault codewhat it means and how to fix it

E.04.13 is the fan lockout on Baxi's two-part and dotted displays: "fan rotor blocked" in the 200/400 Combi manual, "fan blade blocked" in the Combi 2 manual, and "fan impeller blocked or maximum rpm exceeded" on Baxi's professional page. The board asked the fan for a speed and did not get it — either the impeller is not turning, or it is turning far faster than commanded, which happens when the fan has nothing to push against because the tacho or the drive has failed. Either way the boiler cannot prove its combustion air is moving and will not open the gas valve.

Baxi's remedies are short. The 200/400 table: "fan seized, wiring to fan damaged — replace air/gas unit"; the Combi 2 table: "FAN/PCB PROBLEM — check the PCB-fan connection, replace the air-gas unit". The "air-gas unit" is Baxi's name on these ranges for the fan, venturi and gas valve as one assembly, and the point of the wording is that the fan is not a stand-alone part on the newer boilers.

The 200/400 manual has a second fan code, E01 11 "incorrect fan speed", with the cause "external draught over the boiler" and the check "adequate draw on the chimney connection" — a fan that is being spun by wind down the flue — and its user manual lists E01 11 and E04 13 together as "fan fault". This page is rated danger for the reason the boiler locks out: a burner running without proven air movement is a combustion risk, and an intermittent E.04.13 on a boiler that "usually works" is a fan on its way out. There is no householder step. The reset is the button, but a fan that would not turn a moment ago will not turn now, and Baxi's user manual sends a permanent fault that cannot be reset or that recurs to the installer or Baxi Customer Support.