Baxi boiler showing E20 in Brownhills? It usually means a fault with the central heating flow sensor. What it means and how it gets fixed.
E20 on a Baxi usually means a fault with the central heating flow sensor. That small sensor tells the boiler how hot the heating water is. When the reading goes missing or makes no sense, the boiler stops.
The sensor itself is the most common cause, followed by its lead or plug. Check your manual for your model, as wording can vary.
Baxi combis are a familiar sight across Brownhills, Clayhanger and Walsall Wood, many fitted in the 2000s and 2010s. Sensors are one of the parts that tend to tire on boilers of that age.
Switch the boiler off at the switch, wait a minute, then on again and reset once.
Tell us whether the hot water still runs. On some models E20 stops the heating first.
The sensor is inside the boiler. It needs testing with a meter by an engineer.
Tests the flow sensor and its wiring, replaces the faulty part, and runs the boiler through a full cycle.
A photo of E20, the boiler label, and a note on what still works.
Sensors sit against hot pipes and go through thousands of heat cycles a year. Over time the reading drifts or stops. Corrosion on the plug can do the same, especially where the boiler sits in a cold cupboard or garage.
No. The boiler stopped because it could not read a temperature. Any smell of gas means leaving the house first, leaving switches alone, then calling 0800 111 999 for the National Gas Emergency Service.
Usually not. A sensor swap is one of the quicker boiler repairs.
Once is enough. If E20 returns, leave the boiler off.
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