BoilerFaultCodesWarmhaus E19 Fault Code
The Warmhaus E19 fault code means: your boiler has detected that water is not moving through the system correctly, causing a temperature imbalance that has shut the unit down for safety.. It appears on 1 Warmhaus model in our database.
Technical description: Maximum difference failure between 2 NTC temperature sensor – poor circulation.
What causes the Warmhaus E19 fault?
This fault occurs when the boiler's internal sensors detect that water is heating up too quickly or not flowing away from the heat exchanger fast enough. The most common reasons are a failed or blocked circulation pump, air trapped in the system, or a buildup of sludge and debris that has restricted the internal pipework. Because the heat cannot be moved into your radiators effectively, the boiler shuts down to prevent the unit from overheating.
This issue is most frequently seen at the start of autumn when the heating is turned back on after being idle all summer, which can cause the internal pump to seize.
DIY fix possible
Check that your boiler pressure is between 1.0 and 1.5 bar on the gauge.Ensure all radiator valves and isolation valves under the boiler are fully open.Gently bleed your radiators to remove any trapped air pockets.Reset the boiler by pressing the 'R' or Reset button.
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Gas Safe Register →Warmhaus models that show the E19 fault code
Click a model for the full fault code list and model-specific repair notes.
Source
Warmhaus E19 fault code information on this page is sourced and cross-checked against the official Warmhaus service / installation manuals for each affected model.
Reviewed by the BoilerFaultCodes Editorial Team · Last reviewed 27 April 2026