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PostPosted: Fri Aug 24, 2018 12:49 pm 
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Hello, Just just found this forum. I am good in electronics repairs.
I have a Baxi Duo 24 HE A
Here is the manual: https://www.freeboilermanuals.com/assets/pdf/baxi_disc/Duo-tec-Combi-HE-24283340.pdf
Heating is set at 5C from controller and min setting from boiler
Water is 40C from boiler, but Hot water gets like 70C+ and then Heating get hot (maybe safety precaution)
No faults
Is it working this way or I have a fault?
I think the module that "tells" the heater to stop heating the water develop a fault.
Diverter Valve? Maybe Gas Valve?
:dunno:


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PostPosted: Sat Aug 25, 2018 1:15 pm 
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Yes, definitely faulty.

My first thought would be the plate heat exchanger partially blocked, but would need someone in front to test it further before saying for sure.

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PostPosted: Sun Aug 26, 2018 2:34 am 
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Hi Dave,
Thank you for helping us in this forum.
I think making it, when push hot water slowly.
Going to 72-73C and start dropping, radiator pipes get hot.

Is the gas Valve ON/OFF Valve only, doesn't regulate?
That is mine: https://www.google.co.uk/search?q=gas+valve+5119647&rlz=1C1CHBF_en-GBGB703GB703&tbm=shop&source=lnms&sa=X&ved=0ahUKEwjBtLnQwondAhXLZlAKHYejAkwQ_AUICigB&biw=1920&bih=974&dpr=1

If it is temperature sensor failure, wont show the temperature rising, am I right?
Will disassemble it to flush the exchanger next month.


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PostPosted: Tue Aug 28, 2018 3:59 am 
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The amount of gas drawn through the valve is determined by the speed of the fan, so I suppose in simple terms yes it is compared to older boilers where the gas valve would modulate the amount of gas delivered to the burner and the fan speed stayed constant.

The ntc’s can be measured for resistance, but if they were way out the boiler would usually, but not always, throw up a fault code.

With the radiator pipes getting hot when a hot tap is run I would also suspect the diverter valve or it’s actuator head was faulty, although sometimes a blocked plate can cause this symptom.

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