BoilerBuddy · Potterton guide
Potterton boiler fault codes and symptoms
BoilerBuddy helps you diagnose boiler problems, work through minor checks, and escalate major problems to a Gas Safe engineer. Start with the exact code and range shown on your appliance; meanings can differ between models.
From the fault-code directory
Common Potterton codes and symptoms
These examples link to existing records for their specific boiler ranges. Open the matching record for its full context and guidance.
Promax Combi HE Plus
Code E119: Low water pressure
Water pressure switch not operated; primary pressure below 0.5 bar.
Promax Combi HE Plus
Code E133: No flame established — gas off
E133 means the boiler could not establish or detect a flame. The manual lists an interrupted gas supply, failed ignition or a flame that was not detected as possible causes.
Promax Combi HE Plus
Code E125: Overheat NTC tripped
Circulation fault (primary circuit).
Promax Combi HE Plus
Code E20: Return sensor — temperature drift
Central heating temperature sensor (NTC) fault.