BoilerFaultCodesBiasi Excessive temperature on primary circuit Fault Code
Also written as EXCESSIVETEMPERATUREONPRIMARYCIRCUIT — same fault.
The Biasi Excessive temperature on primary circuit fault code indicates a fault on your boiler. It appears on 4 Biasi models in our database.
Technical description: Excessive temperature on primary circuit
Engineer required
This fault requires a Gas Safe registered engineer. Do not attempt gas-related repairs yourself.
Find a Gas Safe engineer
Search the official register for a qualified engineer in your area.
Gas Safe Register →Avoid the next call-out bill
A cover plan would handle faults like Excessive temperature on primary circuit: no call-out fees, no surprise bills.
Affiliate links. We may earn a commission at no extra cost to you.
Biasi models that show the Excessive temperature on primary circuit fault code
Click a model for the full fault code list and model-specific repair notes.
Source
Biasi Excessive temperature on primary circuit fault code information on this page is sourced and cross-checked against the official Biasi service / installation manuals for each affected model.
Reviewed by the BoilerFaultCodes Editorial Team · Last reviewed 31 August 2026