BoilerFaultCodesRavenheat 30 Fault Code
The Ravenheat 30 fault code means: your boiler has shut down because a sensor has detected that the exhaust gases are getting too hot or the sensor itself has failed.. It appears on 8 Ravenheat models in our database.
Technical description: Failed flue temperature – check operating system
What causes the Ravenheat 30 fault?
This fault occurs when the internal sensor detects that the gases leaving your boiler are reaching dangerously high temperatures, triggering a safety shutdown. The most common cause is a buildup of debris or limescale inside the main heat exchanger, which prevents heat from being transferred to your water properly and instead sends it out through the flue. It can also be caused by a faulty sensor sending an incorrect temperature reading to the boiler's computer.
Engineer required
This fault requires a Gas Safe registered engineer. Do not attempt gas-related repairs yourself.
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Gas Safe Register →Ravenheat models that show the 30 fault code
Click a model for the full fault code list and model-specific repair notes.
Source
Ravenheat 30 fault code information on this page is sourced and cross-checked against the official Ravenheat service / installation manuals for each affected model.
Reviewed by the BoilerFaultCodes Editorial Team · Last reviewed 27 April 2026