Ideal Logic Combi 24. Water is perfect for bathing a baby but not for shaving.

[Joeberg1]

Good Evening from sunny Clevedon. Heat Exchange was changed 1 year and 13 days ago. I fitted a new no flow thermister, which I was told would be the main suspect but has made no difference.
Any advice ? I have a big pan on the boil all the time for shaving and doing the washing up but I rather nice hot water came out the taps.

Cheers

 

[ShaunCorbs]

Have you tried slowing the flow of water out of the hot tap eg only open it 1/3

 

[Joeberg1]

Have you tried slowing the flow of water out of the hot tap eg only open it 1/3

Hi Shaun. Yes. It does heat up slightly though not very hot and then goes back to tepid

Andy

 

[ShaunCorbs]

Can you measure the flow rate out of said tap

Is it the same for all taps or just this one ?

 

[king of pipes]

Can you take a picture of the front of the boiler please

 

[Scott_D]

It should increase the water temp by 35 degrees at 10 litres per minute.
Check cold water temp
Set hot tap to 10lpm
Check hot water temp

 

[Joeberg1]

Can you measure the flow rate out of said tap

Is it the same for all taps or just this one ?

Visually I would say the same for kitchen, bath and bathroom sink. How else can I measure the flow ?

 

[Joeberg1]

Can you take a picture of the front of the boiler please

With or without cover ?

 

[Joeberg1]

It should increase the water temp by 35 degrees at 10 litres per minute.
Check cold water temp
Set hot tap to 10lpm
Check hot water temp

So put 10lt bucket under bath tap . let HW run for a couple of minutes, then time it to fill and check temperature ?

 

[snowhead]

Was the temperature O.K before the new heat exchanger or was low temp the reason for changing it?

 

[king of pipes]

With or without cover ?

With please just want to see which model you have

 

[Scott_D]

So put 10lt bucket under bath tap . let HW run for a couple of minutes, then time it to fill and check temperature ?

Use a flow cup

 

[ShaunCorbs]

Or time how long it takes to fill a 1l bottle etc

 

[king of pipes]

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

 

[Joeberg1]

Was the temperature O.K before the new heat exchanger or was low temp the reason for changing it?

It was the reason for the new exchanger.

 

[Joeberg1]

Can you measure the flow rate out of said tap

Is it the same for all taps or just this one ?

Hi Shaun Sorry to take so long back, back and neck don't agree with old age. 10 litres = 1.29 minutes Temp = 24 C

 

[Joeberg1]

With please just want to see which model you have

With please just want to see which model you have

It's the 24 according to the manual

 

[king of pipes]

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

 

[Scott_D]

Does the flow pipe get hot when you run hot water?

 

[king of pipes]

Scotts asking if heat is creeping down the flow heating pipe from the boiler when the hot water tap is open ??

 

[John.g]

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]

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

 

[John.g]

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.