FAIL POINT G Primary Overheat High

Worcester Bosch FAIL POINT G Primary Overheat Fault Code

Q: What does the Worcester Bosch FAIL POINT G Primary Overheat fault code mean?

Your boiler has detected that it is getting dangerously hot and has shut itself down to prevent damage.

Q: How much does it cost to fix Worcester Bosch error code FAIL POINT G Primary Overheat?

Typical repair cost for the Worcester Bosch FAIL POINT G Primary Overheat fault is £150-300 including labour.

Also written as FAILPOINTGPRIMARYOVERHEAT — same fault.

The Worcester Bosch FAIL POINT G Primary Overheat fault code means: your boiler has detected that it is getting dangerously hot and has shut itself down to prevent damage.. It appears on 1 Worcester Bosch model in our database.

Technical description: Primary Overheat. Boiler not fully water pressurised, air in system, pump failure, primary sensor not correctly fixed, or overheat thermostat short circuit across contacts 5 & 6.

Typical repair cost £150-300 (including labour)

DIY fix possible

Check the pressure gauge on the front of the boiler is between 1 and 1.5 bar.If the pressure is low, use the internal filling key to top it up.Ensure all radiator valves are fully open and bleed any trapped air from your radiators.

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Worcester Bosch models that show the FAIL POINT G Primary Overheat fault code

Click a model for the full fault code list and model-specific repair notes.

Greenstar Si Repair: £150-300

Source

Worcester Bosch FAIL POINT G Primary Overheat fault code information on this page is sourced and cross-checked against the official Worcester Bosch service / installation manuals for each affected model.

Reviewed by the BoilerFaultCodes Editorial Team · Last reviewed 27 April 2026