How to mend Apollo 15/305

how can i repair my apollo 30/50 it is not supplying heating just hot water?

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Apollo 40B Main burner cuts out after 10-15 mins?

Apollo 40B?

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MY TOWERCHRON TIMMER ?

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How can I fix Apollo 30/50 boiler?

clock won't work ?

How to fix Apollo 30/50 Boiler?

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apollo boiler banging noises ?

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I have hot water but heating is not working ?

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how can i fix?

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how many killowatts?

How can I tell which replacement Inner Tube to buy?

Apollo 50 Si?

appollo central heating boiler?

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The pilot won't light?