BoilerFaultCodesGledhill Boiler Fault Codes
69 fault codes across 1 Gledhill boiler models — explained in plain English.
Gledhill hot-water and combination boilers.
Just want the most common Gledhill problems?
The top 8 faults across the whole Gledhill range — causes, DIY checks, repair costs.
High-severity Gledhill fault codes
P D1 Lockout error Low pressure safety trip Overheat safety trip
Your boiler has detected that the water pressure in the system is too low to run safely and has stopped working to protect itself.
GB35C
Your boiler has experienced a lockout, meaning it has switched itself off for safety after failing to fire correctly.
GB35C
Your boiler has stopped working safely and needs a simple restart to clear a temporary system error.
GB35C
Your boiler has stopped working because the water pressure inside the system has dropped too low to operate safely.
GB35C
Your boiler has switched itself off to prevent it from getting too hot and causing internal damage.
GB35C
All models
1 Gledhill boiler models
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