BAXI 105E warm water

9 Sep 2011
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United Kingdom
Baxi 105e has warm water not hot, I checked the CH flow for heat transfer with pipes staying cold, I also isolated CH on both sides still warm DHW , temp led's show 70/80 but still warm. This seems to have been losing heat over some time, question could it be a scaled/blocked HEX or maybe temp sensor.? If HEX was going to get HEX cleaned, is it worth cleaning or should I get new.?? Thanks J
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I suppose thats and option,,,, Just thought I would ask the knowledgeable masses on the Do It Yourself forum to see if something straight forward before calling out a specialist.
Supposing I decide to take hex off and clean , what would be recommended to flush it through??
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Is the flame staying on when it gets to 80 ? Or is it going off then on ? When was it last serviced ?
Flame stays constant throughout. Does cut in and out when tap is turned down to lower flow and led sits at 70. Had someone out last year when diverted was letting by, guy changes something in valve and said he had checked over ,all looked fine wasn't here so can't comment on what was done.
Clean the plate by removing it and putting brick acid in it for 20 mins
Problem found, decided to try and clean HEX, so isolated boiler to drain down, strange enough hot water would not stop running even with isolator shut.. so went round all shower,bath, sink etc and finally found that shower in main bathroom is faulty and letting cold by. shut. new question to you would be is the valve repairable or do i need new as never replaced cartridge/disc etc.??? Valve was from bathstore when originally put in.. found paperwork and make is crosswater thermostatic MC1000RC
For those that may have same problem. Dhower thermostatic valve and and shutoff valves removed, descaled thouroughly cleaned and reinstalled. Not let by on both hot or cold, reduced hot water temp control to half from full and still hard to hold hand under piping hot water.. Happy bunny. :) Thanks for those that offered positive ideas.

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