BoilerFaultCodesPotterton 27 Fault Code
The Potterton 27 fault code means: your boiler has detected that either the water pressure is too low for the system to run or the internal pump is unable to circulate water effectively.. It appears on 5 Potterton models in our database.
Technical description: Fault on Pump or Low System Pressure
What causes the Potterton 27 fault?
This fault occurs when there isn't enough water pressure or flow to safely move heat away from the boiler's internal components. The most common reasons are a simple drop in system pressure due to a small leak or bleeding radiators, or a mechanical failure where the internal pump has seized and can no longer push water around your home.
This issue is frequently seen in autumn when heating systems are turned back on after being idle all summer, which can cause the internal pump to stick or seize.
DIY fix possible
Check the pressure gauge on the front of the boiler; it should be between 1 and 1.5 bar.If the pressure is below 1 bar, use the filling loop underneath the boiler to top up the system.Turn the boiler off and back on again to reset the fault code.
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Potterton models that show the 27 fault code
Click a model for the full fault code list and model-specific repair notes.
Source
Potterton 27 fault code information on this page is sourced and cross-checked against the official Potterton service / installation manuals for each affected model.
- Potterton Performa 24 manual (PDF)
- Potterton Performa 24i HE manual (PDF)
- Potterton Performa 28i manual (PDF)
Reviewed by the BoilerFaultCodes Editorial Team · Last reviewed 31 August 2026