BoilerFaultCodesPotterton E119 Fault Code
The Potterton E119 fault code means: your boiler has detected that the water pressure is too low for it to operate safely and has shut down.. It appears on 12 Potterton models in our database.
Technical description: Water Pressure Switch Not Operated
What causes the Potterton E119 fault?
This fault occurs when the system water pressure drops below the minimum level required for the boiler to heat up safely. The most common reason is a small leak in the radiator network or pipework, but it can also happen if you have recently bled your radiators without topping the water back up. When the internal sensor detects this lack of pressure, it cuts the power to the burner to prevent the unit from overheating.
This issue often occurs at the start of autumn when homeowners turn their heating back on for the first time or bleed their radiators to remove air pockets.
DIY fix possible
Locate the filling loop (a flexible silver hose) underneath or near the boilerSlowly open the one or two taps/levers on the filling loop until you hear water movingWatch the pressure gauge and close the taps when the needle reaches 1.5 bar
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Potterton models that show the E119 fault code
Click a model for the full fault code list and model-specific repair notes.
- Apollo Repair: £80-150
- Gold Combi ErP Repair: £0-160
- Gold Combi HE Repair: £0-160
- Gold HE Repair: £0-120
- Gold System ErP Repair: £0-120
- Heatmax Combi Repair: £80-150
- Promax Combi 28 HE Plus Repair: £0-120
- Promax Combi ErP Repair: £0-120
- Promax Combi HE Plus Repair: £0-120
- Promax System ErP Repair: £0-120
- Promax System HE Plus Repair: £0-120
- Titanium Combi Repair: £80-150
Source
Potterton E119 fault code information on this page is sourced and cross-checked against the official Potterton service / installation manuals for each affected model.
- Potterton Apollo manual (PDF)
- Potterton Gold Combi ErP manual (PDF)
- Potterton Gold Combi HE manual (PDF)
Reviewed by the BoilerFaultCodes Editorial Team · Last reviewed 7 July 2026