Low
Pump Overrun - Central Heating on Potterton Envoy 30

Your boiler is briefly keeping the pump running to move leftover heat away from the unit, which is a normal part of the cooling-down process.

Reviewed by the BoilerFaultCodes Editorial Team · Last reviewed

Monitor it

This is a minor fault. Keep an eye on it and mention it at your next annual boiler service. Reset the boiler and see if it clears.

What the manual says

Manufacturer manual

Control Status: Pump Overrun (Central Heating)

From this model's manual
Verified against the Potterton/Potterton Envoy 30 installation & service manual.
Plain-English guidance below. Severity, DIY steps, costs and parts are our interpretation to help you act, not text from the manual.

DIY fix possible

No action required; this is a normal operating function.Wait for the cycle to complete naturally.Check that at least one radiator (usually the one in the room with the thermostat) has its valves fully open.

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All 31 fault codes on the Envoy 30

Seeing a different code? Every code this model can display, in one place.

Blocking ErrorBurner OnC1C2C3Case sensorCase temperatureControl failedDisplay not illuminatedDry fireDry fire sensorFan OverrunFan PurgeFan speedFlame lossFLASHINGFlow sensorGas OnHot Surface IgniterIgnition Pre ChecksLockoutOverheatPump Overrun - Storage TankReturn sensorSensorSensor FlowSensor Flow or return sensorShorted signalStand-byWiring fault

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