BoilerFaultCodesPotterton Error 119 Fault Code
Also written as ERROR119 — same fault.
The Potterton Error 119 fault code means: your boiler has stopped working because the water pressure inside the heating system has dropped too low.. It appears on 1 Potterton model in our database.
Technical description: CH system pressure less than 0.5 bar / Water pressure switch
DIY fix possible
Locate the external filling loop, which is usually a silver braided hose with one or two valves located underneath the boiler.Open the valve(s) slowly to allow water into the system until the pressure gauge on the front of the boiler reads between 1.0 and 1.5 bar.Close the valve(s) tightly and the boiler should automatically reset.
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 Error 119: no call-out fees, no surprise bills.
Affiliate links. We may earn a commission at no extra cost to you.
Potterton models that show the Error 119 fault code
Click a model for the full fault code list and model-specific repair notes.
Source
Potterton Error 119 fault code information on this page is sourced and cross-checked against the official Potterton service / installation manuals for each affected model.
Reviewed by the BoilerFaultCodes Editorial Team · Last reviewed 7 July 2026