Main Boiler Error Codes

Main Boiler Error Codes

Fault Code
System Behaviour
E168
Error code E168 could mean that your boiler has detected a problem but can’t work out exactly what it is;
E20
Central Heating NTC Fault indicate faulty components. You
should make a note of the displayed error code
E28
PCB Fault indicate faulty components
E50
Hot Water NTC Fault indicate faulty components
E110
Safety Thermostat operated – displayed when the primary water pressure is less than 0.5 bar. After repressurising the system the boiler should operate. Your installer will be able to advise you about the method of repressurising.
E119
Water pressure switch not operated – displayed when the primary water pressure is less than 0.5 bar. After repressurising the system the boiler should operate. Your installer will be able to advise you about the
method of repressurising
E33
Interruption Of Gas Supply or Flame Failure indicates that the gas supply has been interrupted, ignition has failed or the flame has not been detected. Ensure that the gas supply has not been turned off, and turn the selector switch to the reset position and hold for at least 5 seconds. If the boiler does not relight, or the code is displayed regularly.
E60
Fan or fan wiring fault

Main Eco Compact Boiler

Fault Code
System Behaviour
E09
Gas valve connection error
E15v
Gas valve error
E20
Central heating negative thermistor coefficient (NTC) sensor error
E28
Flue negative thermistor coefficient (NTC) sensor error
E40
Central heating return sensor error
E83
Communication error
E109
Pre-circulation fault
E110
Safety thermostat operated
E109
Pre-circulation fault
E110
Safety thermostat operated
E118
Primary system water pressure too low
E125
Circulation error
E128
Flame error
E130
Flue negative thermistor coefficient (NTC) sensor operated
E133
Interruption of gas supply or flame error
E135
Interruption of gas supply
E154
Flow return sensor temperature test
E160
Fan or fan wiring error
E270
Circulation fault (dry fire)
E321
Hot water negative thermistor coefficient (NTC) error
E384
False flame

Main Error Code E133

A Main boiler showing the error code E133 means that the condensate pipe has frozen. This is an issue that can happen during the cold winter months as the condensate pipe leads outside but luckily this is an issue that can be resolved fairly quickly without the need for an engineer. You just need to thaw out the condensate pipe, which you can find out how to do with our guide.

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