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Thanks Ian - I'll try it tonight!

Hi Chris, The primary flow switch works fine for CH but nothing for DHW

Yes, the pump runs on both CH and DHW. The only difference is the primary flow switch turns on for CH but not for DHW

Hi Ian, It's solid red.

Hi, Due to my old heat exchanger getting clogged up and giving me a hot cold hot cold hot shower I have today replaced the heat exchanger - something which has worked well in the past to resolve the same problem. After fitting the new part today though, I am left with no hot water. The CH works...