Emergency
Excessive temperature on primary circuit on Biasi Riva Plus HE 24C ErP

Your boiler has automatically shut down because the water inside it has become dangerously hot.

Reviewed by the BoilerFaultCodes Editorial Team · Last reviewed

Act immediately

Turn off your boiler and stop using gas appliances. Call a Gas Safe engineer now. This fault can be dangerous if ignored.

What the manual says

Manufacturer manual

Excessive temperature on primary circuit

From this model's manual
Verified against the Biasi/Biasi G101 Biasi Riva Plus He 24c Erp Service Manual 4758341 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.

Engineer required

This is a emergency severity fault. Stop using the boiler and call a Gas Safe registered engineer. Do not attempt gas-related repairs yourself.

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Related fault codes

Er02View →Er03View →Er04View →

All 11 fault codes on the Riva Plus HE 24C ErP

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

Faulty air pressure sensorFaulty C.H. temperature probe NTCFaulty D.H.W. temperature probe NTCFaulty flue temperature probe NTCFaulty primary circuitFlame detection errorFlue temperature probe NTC lock outLack of burner ignitionLack of power supplySafety thermostat lock out

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