BoilerFaultCodesYour boiler has stopped working because it cannot correctly measure the temperature of the water leaving the unit, usually due to a faulty internal sensor or wiring issue.
Book a Gas Safe engineer within 24–48 hours. Your boiler may be unsafe or could break down completely if left.
Technical description: Flow temperature sensor short circuit or incorrectly connected
What causes this fault?
This fault occurs when the boiler's internal computer receives an impossible electrical signal from the sensor that monitors the heat of the water leaving the unit. The most common reason is that the sensor has suffered an internal failure or the wires connecting it have become loose or damaged, preventing the boiler from safely regulating its temperature.
Engineer required
This fault requires a Gas Safe registered engineer. Do not attempt gas-related repairs yourself.
Find a Gas Safe engineer
Search the official register for a qualified engineer in your area.
Gas Safe Register →Protect yourself from future repair bills
A boiler cover plan would cover faults like E2 — no call-out fees, no surprises.
Affiliate links — we may earn a commission at no extra cost to you.
Worcester Bosch 29 HE Conventional is discontinued — time for a new one?
Parts for discontinued models can be hard to find and expensive. A new A-rated boiler could save you money on both repairs and energy bills.
Affiliate links — we may earn a commission at no extra cost to you.