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Burner goes out
Boiler operates but
temperature fails to rise
Condensate in boiler
Boiler sooting
Radiators cold in winter
28
Sigma
Check the safety thermostat
Check the electrode is positioned correctly and free
from corrosion deposits
Control thermostat set too low
Check the electric supply
Check the electronic control unit
Check the live-neutral wires are not reversed
Insufficient gas supply
Check gas pressure to main burner
Boiler dirty
Check and clean heat exchanger
Burner or injector dirty
Check and clean burner or injector
Faulty flow temperature sensor
Replace flow temperature sensor
Incorrect gas pressure
Check for correct gas consumption
Boiler dirty
Check and clean heat exchanger
Boiler inadequate
Check that the boiler is correctly sized for the requirements of the
central heating system
Thermostat set too low
Adjust thermostat to a higher temperature (more than 50 ° C)
Incorrect gas rate
Check that gas consumption is correct and adjust pressure if necessary
Faulty flame adjustment
Check that the burner flame is adjusted correctly
and that gas consumption is correct for the boiler output
Burner air ports blocked
Clear air ports
Faulty flow temperature sensor
Replace flow temperature sensor
Room thermostat set too low or faulty
Adjust knob to a higher temperature and if necessary replace stat
Pump is stuck and fails to rotate
Free the pump by removing the top and rotating the shaft with
a screwdriver
The pump does not rotate
Replace the condenser or pump after checking electricity supply
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