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• E09 - Gas valve wiring fault

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• E10 - Outdoor sensor error

 

• E15 - Gas valave connection fault

 

• E20 - Central heating thermistor sensor fault

 

• E28 - Flue thermistor fault

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• E40 - Central heating return thermistor fault

 

• E50 - Domestic hot water sensor fault

 

• E53 - Flue obstruction

 

• E55 - Calibration required

 

• E78 - Water pressure sensor fault

 

• E83/84/85/86/87 - No communication between room

       controller and boiler

 

• E92 - Combustion test alarm during auto-setting

 

• E109 - Poor circulation

 

• E110Boiler overheat tripped

 

• E117 - System pressure high (>2.9 bar)

 

• E118 - System pressure low (<0.5>

 

• E125 - Primary water circulation fault

 

• E128 - Loss of flame during operation

 

• E129 - Loss of flame during calibration

 

• E130 - Flue thermostat sensor tripped (lockout)

 

• E133 - Ignition fault

 

• E135 - Internal error

 

• E154 - Primary flow fault

 

• E160 - Fan fault

 

• E270 - Dry fire

 

• E317 - Wrong power supply (HZ)

 

• E321 - Hot water thermistor fault

 

• E384 - Flame detected when gas valve off (false flame)

 

• E385 - Low voltage (less than 195v)