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how can i fix my dhw problem on ravenheat combi csi 85?

i have a ravenheat combi model CSI 85 when i turn on hot water, after a short time cold water starts to flow.then hot water starts again ,then cold water,then hot.i have seen that the burners switch on/off.could you please tell me what the problem could be. thank you

javed akhtar
February 2008
RavenheatRavenheat CSI 85Heating, Home Heating SystemsRavenheat Combi Boiler Hot Water
Mine is doing the same . I have a rsf 84et and it has been nothing but a pain since it was installed.

Gaz S
April 2008

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Ravenheat CSI 85 DHW Problem & Fixes