BoilerFaultCodesVokera Alarm high limit thermostat Fault Code
Also written as ALARMHIGHLIMITTHERMOSTAT — same fault.
The Vokera Alarm high limit thermostat fault code means: your boiler has detected that the water inside it has become dangerously hot and has shut down to prevent damage or overheating.. It appears on 5 Vokera models in our database.
Technical description: Alarm high limit thermostat
Engineer required
This fault requires a Gas Safe registered engineer. Do not attempt gas-related repairs yourself.
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Vokera models that show the Alarm high limit thermostat fault code
Click a model for the full fault code list and model-specific repair notes.
Source
Vokera Alarm high limit thermostat 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 7 July 2026