BoilerFaultCodesYour boiler is having trouble measuring the temperature of your hot water, which usually means it won't provide hot water to your taps.
Book a Gas Safe engineer within 24–48 hours. Your boiler may be unsafe or could break down completely if left.
Technical description: Domestic hot water sensor fault
What causes this fault?
This fault occurs when the boiler's internal computer stops receiving a reliable signal from the sensor that monitors your hot water temperature. The most common reason is that the sensor has physically failed or 'drifted' out of its correct settings, meaning the boiler can no longer safely judge how hot the water is. Occasionally, it can be caused by loose or damaged wiring that has broken the communication link between the sensor and the main 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 E50 — 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.