BoilerFaultCodesYour boiler is struggling to accurately gauge the weather outside, meaning it might not provide the right amount of heat for your home.
This fault should be looked at by a Gas Safe engineer within the next week or two. It may get worse if left.
Technical description: Constant mode. Short circuit - outside temperature sensor.
What causes this fault?
This fault occurs when the connection to the external weather sensor is broken or damaged, causing a short circuit. The most common reason is water ingress within the sensor housing or a physical break in the thin wiring that runs from the boiler to the outside of your home.
This fault often appears during autumn or winter when heavy rain or frost penetrates the external sensor casing and triggers an electrical short.
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 10 — no call-out fees, no surprises.
Affiliate links — we may earn a commission at no extra cost to you.