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Discuss Ideal Logic Combi 24. Water is perfect for bathing a baby but not for shaving. in the Central Heating Forum area at PlumbersForums.net

king of pipes

Esteemed
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I've had issues with these but never this time of the year ? as stated above your combi will only add 35°c to the incoming water temperature so say its 12°c then you will get hot water at 47 °c at 9 litres ish a minute the only way to achieve a higher temperature is to slow the passage of water through the plate heat exchanger but this also decreases the flow rate, it maybe your plate heat exchanger needs cleaning? Kop
 

king of pipes

Esteemed
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Gas Engineer
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5,153
Was the main heat exchanger changed ?? Or the hot water plate heat exchanger ?? The big aluminium part is the main one as below arrowed in blue , the stainless steel heat X is the silver component tucked behind arrowed in red this is the part that heat your water and can become partially blocked and the water temperature drops off ? this is the exact same one as yours . Kop
 

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king of pipes

Esteemed
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Gas Engineer
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5,153
Scotts asking if heat is creeping down the flow heating pipe from the boiler when the hot water tap is open ??
 
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It was only flowing 7.8LPM at 24C which is only about 6C above the present cold water temp, about 3.3kw, will a combi fire constantly at this very low output?. maybe some problem with temp control assuming its turned up fully.
 

king of pipes

Esteemed
Plumber
Gas Engineer
Messages
5,153
The logics also suffer with flow turbine problems they sometimes stick and get grubby if you can't get enough flow through it the boiler it will only run at a reduced rate you really need a Gsi who knows his way round a ideal Logic . Kop
 
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Under normal conditions with the temperature control set to maximum of 60C then even this restriced flow of 7.8 LPM will require 22.8kw (from cold at 18C) so maybe other problem(s) as well.
 

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