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ravenheat csi 85 a [t] boiler?

main burner fires up on off repeatedly, heating water gets hot, domestic gets hot for few minuits then runs cold.
GEORGE, December 2010
mine did this and a new fan control board fixed it. Very simple to fit and costs around £45+vat from ravenheat. Check your user manual

jomer, January 2011
link Click here to see other fixes for Ravenheat.