BoilerFaultCodesRavenheat 41E Fault Code
The Ravenheat 41E fault code means: your boiler has detected that the water isn't moving through the system correctly, causing a large temperature gap between the pipes.. It appears on 7 Ravenheat models in our database.
Technical description: Different temperature between flow and return
What causes the Ravenheat 41E fault?
This fault occurs when the boiler detects that water is leaving the unit much hotter than it is when it returns, suggesting the water is stuck or moving too slowly. The most common reasons are a failing internal pump that can't push the water around, or a blockage caused by a buildup of sludge and debris in the system or heat exchanger.
This issue often surfaces in autumn when the heating is turned back on after the summer, as the pump can seize or debris can settle during the months of inactivity.
DIY fix possible
Check that all radiator valves are fully openEnsure the boiler pressure is between 1.0 and 1.5 barBleed all radiators to remove trapped air bubbles
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Gas Safe Register →Ravenheat models that show the 41E fault code
Click a model for the full fault code list and model-specific repair notes.
Source
Ravenheat 41E 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