BoilerFaultCodesYour boiler has shut down because a temperature sensor has detected that the water leaving the system is getting too hot.
Book a Gas Safe engineer within 24–48 hours. Your boiler may be unsafe or could break down completely if left.
Technical description: Outlet probe error for having exceeded the temperature limit
What causes this fault?
This fault occurs when the boiler's internal safety sensors detect that the water temperature exiting the unit has risen above safe operating limits. It is typically caused by a lack of water flow, often due to a pump failure or a blockage within the heat exchanger. In some cases, the sensor itself may have developed a fault and is providing an inaccurate reading to the boiler's control board.
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 E46 — no call-out fees, no surprises.
Affiliate links — we may earn a commission at no extra cost to you.
Could it be time for a new boiler?
If repair costs are adding up, a new energy-efficient boiler could be the smarter long-term choice.
Affiliate links — we may earn a commission at no extra cost to you.