BoilerFaultCodesWarmflow 2133 Fault Code
The Warmflow 2133 fault code means: your boiler is telling you that the internal water pressure is too low for it to operate safely and needs to be topped up.. It appears on 1 Warmflow model in our database.
Technical description: Filling Loop
DIY fix possible
Locate the filling loop, which is usually a silver braided hose with a small valve under the boiler.Open the valve slowly to allow water into the system until the pressure gauge reads between 1.0 and 1.5 bar.Close the valve tightly and check that the fault code clears.
Find a Gas Safe engineer
Search the official register for a qualified engineer in your area.
Gas Safe Register →Avoid the next call-out bill
A cover plan would handle faults like 2133: no call-out fees, no surprise bills.
Affiliate links. We may earn a commission at no extra cost to you.
Warmflow models that show the 2133 fault code
Click a model for the full fault code list and model-specific repair notes.
Source
Warmflow 2133 fault code information on this page is sourced and cross-checked against the official Warmflow service / installation manuals for each affected model.
Reviewed by the BoilerFaultCodes Editorial Team · Last reviewed 7 July 2026