BoilerFaultCodesVokera YELLOW LED Solid Fault Code
Also written as YELLOWLEDSOLID — same fault.
The Vokera YELLOW LED Solid fault code means: your boiler has detected a problem with the temperature sensor that controls your hot water, meaning you likely have no hot water or the temperature is inconsistent.. It appears on 5 Vokera models in our database.
Technical description: DHW thermistor fault (see 7.2.5.2)
What causes the Vokera YELLOW LED Solid fault?
This fault occurs when the sensor responsible for measuring the temperature of your hot water fails or sends an incorrect signal to the main control board. The most common reason is that the internal components of the sensor have worn out over time due to constant heating and cooling, or the electrical connection has become loose or corroded. Because the boiler no longer knows how hot the water is, it shuts down the hot water function as a safety precaution.
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 →Vokera models that show the YELLOW LED Solid fault code
Click a model for the full fault code list and model-specific repair notes.
Source
Vokera YELLOW LED Solid fault code information on this page is sourced and cross-checked against the official Vokera service / installation manuals for each affected model.
Reviewed by the BoilerFaultCodes Editorial Team · Last reviewed 27 April 2026