BoilerFaultCodesYour boiler's temperature sensor has stopped working correctly, meaning the system can no longer tell how hot the water is and has shut down as a precaution.
Book a Gas Safe engineer within 24–48 hours. Your boiler may be unsafe or could break down completely if left.
Technical description: If a fault occurs with the boiler thermostat the fault display screen will show "C/H Sensor Fault".
What causes this fault?
This fault occurs when the internal sensor responsible for monitoring water temperature becomes damaged or loses its ability to send an accurate electrical signal. The most common reasons are electrical failure within the thermistor itself or corrosion on the wiring connections caused by years of heat cycling.
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 C/H Sensor Fault — no call-out fees, no surprises.
Affiliate links — we may earn a commission at no extra cost to you.
Ideal Concord CXC 48 116 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.