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No Hot water on a Saunier Duval Semia F30E?

Hi, having trouble with my boiler, when you turn on the hot tap the boiler fires up but the temperature wont go above 39. It appears to rise slowly up then when it reaches 39 it drops back down to the low 20s . The flame comes on then it goes out and the temperature drops back down. This is also the case when you turn on the central heating.

Phil
October 2011
Saunier DuvalHeating, Home Heating SystemsWater Boiler Turn
i had same probs try either air pressure switch if not its the pcb

rich o
October 2011

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