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Mend Raven Heat CSI AAA T 780 High Condensing Boiler

Raven heat CSI AAA T 780 series high efficiency condensing boiler?

Central heating works fine can't get any domestic hot water unless heating has been on for half an hour.

Andrew doherty
March 2017
Raven HeatRaven Heat CSI AAA T 780Heating, Home Heating SystemsHigh Condensing Boiler
There will be a valve that directs heated water to radiators or the hot water tank - one or the other and sometimes to both at the same time. My guess is that your diverter valve is stuck and will not return to the hot water only position.

https://www.youtube.com/watch?v=T7UTDtrmcvM

https://www.youtube.com/watch?v=M9DkNwVL4Dc

You can take the motorised head off and operate the sticky valve with a spanner or pliers.

Good Luck...
March 2017

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Raven Heat CSI 780: No Hot Water Fix