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Thanks, fault was blocked heat exchanger but removing it my plumber damaged overheat stat and being a Sunday no spare. When i checked found stat open circuit, suspected in normal operation there should be continuity but just wanted to check.

When checking electrical continuity across terminals on the overheat thermostat. If thermostat cold (not tripped) should the reading be continuity or open circuit

As i said no water flow of any sorts, no water coming out of DHW pipe which as i said is hot.

Just noticed pipe work from heat exchanger, through DHW sensor and out seems to be hot , yet no flow of any water hot or cold ?

its all hot water taps, noticed some small black deposits when using hot water recently, as said previously water flow went to trickle, last night stopped completely. I have fed direct cold water through washing machine pipes to see if air lock as well. CH still working fine. If scaled up would...

yep, no hot water coming out of tap.no water fowing out of DHW flow at boiler. Water flow turbine replaced, water going into pump. Help!

No its not a condensing boiler ,just plain old fashioned combi.Would power flush cure problem or would I need to chemical treat it ?

Need some advice guys. I have a worcester bosh 24i combi boiler which has been nothing but trouble, its about 2 years old and currently i have all heating system working but the hot water firstly theperformance started to deteriate, then the hot water would only work with heating on, now we have...