Potterton Osprey CF 125 Fault Codes

Regular Natural Gas 36.6 kW 1994-2005 Discontinued

GC Number: 41-590-78

The fault code is already on your display

Note it down before pressing reset — resetting clears the code immediately. How to read fault codes →

Most common fault codes

Code	Severity	Plain English	DIY
Boiler Safety Overheat neon	High	Your boiler has switched itself off because it has become too hot to operate safely.	Yes
Flame Failure neon	High	Your boiler has lost its flame while it was supposed to be running, causing the system to shut down for safety.	Yes
Flue Safety Thermostat (Cycling)	Emergency	Your boiler is shutting itself down because exhaust fumes are not escaping correctly through the chimney, which could cause dangerous gases to enter your home.	Engineer
TTB constant trip	Emergency	Your boiler is automatically shutting down because it has detected dangerous exhaust fumes backing up into your home instead of escaping safely through the chimney.	Engineer
Yellow flame / excessive lifting	Emergency	Your boiler is not burning gas correctly, which can be dangerous and indicates a serious combustion problem.	Engineer

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