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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
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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