Ideal he 24 c heating but no hot water

[gingalig]

Hope I can get some advice, called out to a no hot water issue , I have checked theoperation of the actuator and the diverter all seems ok, I’mabout to order a DHW flowswitch , the boiler fires forheating and the heating works fine, and a very small amountof hot water will arrive at tapsbut then flows cold, heating off and there is again a tiny amount of warm water then flows cold, apologies if I’m asking obvious questions, I’m a bit new to diagnostics. Thank you in advance for any advice.

 

[Last Plumber]

Hope I can get some advice, called out to a no hot water issue , I have checked theoperation of the actuator and the diverter all seems ok, I’mabout to order a DHW flowswitch , the boiler fires forheating and the heating works fine, and a very small amountof hot water will arrive at tapsbut then flows cold, heating off and there is again a tiny amount of warm water then flows cold, apologies if I’m asking obvious questions, I’m a bit new to diagnostics. Thank you in advance for any advice.

Presuming that we're both thinking of the same Boiler.
Have a look through the manual here and follow the fault chart. It tells you how to test the DHW side. There are a few things to check. See page 49.

 

[king of pipes]

As above bud. Good luck kop

 

[Last Plumber]

As above bud. Good luck kop

View attachment 32756

View attachment 32757

Well KOP, you're obviously more of a computer whizz kid than I.
Pray tell, how did you do that?
LP

 

[king of pipes]

Down load the manual find the page you want screen shot it then upload it from there Last i think your putting yourself down a bit bud its pretty cool how you put the whole manual in the word ( here) . cheers kop

 

[Scott_D]

Does it have the flow turbine with red led?

 

[ShaunCorbs]

I've done a lot of repairs due to the turbine failing very easy to change but I would change the flow sensor as well

Very easy to do and less than 10 mins to change both

 

[gingalig]

I've done a lot of repairs due to the turbine failing very easy to change but I would change the flow sensor as well

Very easy to do and less than 10 mins to change both

Excuse my ignorance/lack of knowlege is that the magnetic flow switch (the turbine ) I have changed the flow sensor and initially it worked , called for heating and it still worked then hot water stopped. turned off the power and then calling for hot water all worked well again, checked multiple times then it stopped firing for hot water again. turn the power on and then off and it all works fine for a while. ?? then stops again, Looking through the M.I's and it seems to be pointing to a PCB fault although this was apparently changed less than a year ago. Any thoughts It's giving me a headache.

 

[ShaunCorbs]

Yes

The switch should light up constant red led if it doesn't change the mag flow switch

 

[townfanjon]

You will change 20 turbines to 1 sensor .
Use a ring spanner to remove it but be careful, I have never broken a housing but my butcher of a pal has broken 2

 

[gingalig]

Thank you for the info, I shall order the bits and see what the morning brings.

 

[gingalig]

Thanks for the help there, one happy customer and I managed to learn a few things.

Thank you again you’re all stars