BoilerFaultCodesVokera Red | On permanently Fault Code
Also written as REDONPERMANENTLY — same fault.
The Vokera Red | On permanently fault code means: your boiler has become too hot and has shut itself down as a safety precaution to prevent damage.. It appears on 1 Vokera model in our database.
Technical description: Appliance overheat
What causes the Vokera Red | On permanently fault?
This fault occurs when the water inside the heat exchanger reaches an unsafe temperature, triggering a safety sensor to cut the power. The most common reasons are a failed pump that isn't moving water around the system or a blockage of sludge and debris restricting the flow. Sometimes, a faulty sensor can also trick the boiler into thinking it is overheating when it actually isn't.
This fault is more common in autumn when heating systems are switched back on after a long summer break, often causing internal pump components to seize.
DIY fix possible
Wait at least 20 minutes for the boiler to cool down naturally.Ensure all radiator valves (TRVs) are fully open to allow water to flow.Turn the mode selector switch to the 'OFF/RESET' position, wait a few seconds, then turn it back to the original setting.
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Gas Safe Register →Vokera models that show the Red | On permanently fault code
Click a model for the full fault code list and model-specific repair notes.
Source
Vokera Red | On permanently 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