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Main Boilers

Main Combi Boilers

Main combi boilers are narrow wall mounted boiler that are generally located in a kitchen or bathroom and tucked away within a cupboard and provide prompt access to hot water from the mains water supply to taps and radiators. Main combi boilers are energy efficient units with low running costs that are ideally suited to apartments and small to medium sized houses with 1 to 2 bathrooms. Main combi boilers don’t require hot water tanks or cylinders as a regular boiler or system boiler does therefore making these Main combi boilers cheaper to install.
BoilerEfficiencyOutputWarrantyMPNBoiler Type
Main Eco Compact 25kW Gas Combi Boiler93%25kW5 YearsCombi
Main Eco Compact 30kW Gas Combi Boiler93%30kW5 YearsCombi
Main Eco Elite 25kW Gas Combi Boiler89%25kW5 YearsCombi
Main Eco Elite 30kW Gas Combi Boiler88.7%30kW5 YearsCombi

Main System Boilers

BoilerEfficiencyOutputWarrantyMPNBoiler Type
Main Eco Compact 15kW Gas System Boiler93%15kW5 YearsSystem
Main Eco Compact 18kW Gas System Boiler93%18kW5 YearsSystem
Main Eco Elite 24kW Gas System Boiler89.1%24kW3 YearsSystem
Main Eco Elite 28kW Gas System Boiler88.8%28kW3 YearsSystem

Main Regular Boilers

BoilerEfficiencyOutputWarrantyMPNBoiler Type
Main HE A 12kW Gas Regular Boiler88.7%12kW3 yearsRegular
Main HE A 15kW Gas Regular Boiler89%15kW3 yearsRegular
Main HE A 18kW Gas Regular Boiler88.7%18kW3 yearsRegular
Main HE A 24kW Gas Regular Boiler88.9%24kW3 yearsRegular
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
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
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