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dhw working fine but chw switsh off after 10 second?

i have combi boiler potterton performa28. i have put new dhw pressure differtial valve..dhw is working fine but chw not. thank you.
zino, October 2012
poor circulation, check filter mesh may be blocked after draining boiler open cap on front end of return boiler isolation valve and check filtermesh and clean as necessary and re fix back and try.

k, October 2012
link Click here to see other fixes for Potterton.