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Can someone please indicate which way round the photoresistor should be installed on a Trianco Eurostar oil boiler with a Stirling burner assembly, The resistor is keyed to its holder, so only fits one way. The connecting plug has D shaped polarizing pins but actually fits either way! The...

My Trianco Eurostar 110 STD oil boiler is about 10 years old and has worked without problems all that time. It is fitted with a Stirling 50 burner and has a balanced flue which goes straight out through the wall behind it. Oil is supplied via a Tiger Loop. Earlier this year it started...