Ideal logic 30 combi. HW issue

[armyash]

Hi, tonight's job is as follows. Cust has just bought the house and not moved in yet, currently decorating.


Been to look at their ideal logic 30. Boiler in the kitchen. Shower is a thermostatic bar. Water runs Luke warm. Basin runs a bit better but runs cooler the higher the flow. Bath hot tap is the same if I turn the flow down the water runs hotter. ( the tap itself seems in need of a repair as the water either dribbles out or shoots out, I think the valve needs greasing and new washer)


kitchen hot runs much better but only 1m from the boiler but then in full flow it runs lukewarm. Normally I would go straight for the hex but the boiler was serviced in September, the notes on the service record say 'leak on hex, needs replacing'.


The boiler was still under warranty at the time and apparently Ideal went out in November and changed numerous parts including the hex but there is no proof of this. The cust has a document from solicitor showing this info but have been advised they have to contact ideal for confirmation this part has been changed at a cost of £20 which they are doing tomorrow.


The problem is just because the ideal engineer might have said he changed the hex doesn't mean he did. The boiler is reasonably new so it's not as though I can look at the hex and see if it looks new or not.


If it's not the plate, what else could it be?


Thanks

 

[townfanjon]

Usual HW problem on these is the turbine , cover off run a hot tap , the sensor should show a solid red light , not expensive, easy to change but check it first

 

[armyash]

Usual HW problem on these is the turbine , cover off run a hot tap , the sensor should show a solid red light , not expensive, easy to change but check it first

Thanks will go back up tomorrow night and check that.

The hex gets extremely hot if it makes any difference, too hot to touch for more than a couple of seconds.

 

[oz-plumber]

Do those units have a water temperature sensor ( plunge sensor / thermister )

Should be screwed into or clamped onto hot water pipe with a couple of wires connected to it.

What your describing fits the bill with a faulty sensor

 

[oz-plumber]

Do those units have a water temperature sensor ( plunge sensor / thermister )

Should be screwed into or clamped onto hot water pipe with a couple of wires connected to it.

What your describing fits the bill with a faulty sensor

 

[Stanios]

Does it cycle on hot water? Also whats the gas supply like?

 

[armyash]

Boiler stays alight on hw, temp is stable so long as taps are not run on full flow.

Back tonight as was short of time last night will check everything over and update.

 

[hammers4spanner]

get rid of it put a decent boiler in sick of the sight of these this winter.

 

[newcastle phill]

Not the answer hammers lol

 

[armyash]

For anyone interested.

Solid red light on flow turbine.

Removed plate and cleaned out with descaling chemical. Got a bit of debris out but not the worst I've seen.

Replaced plate and tested. Kitchen hot tap runs extremely hot at about 75% flow, if I increase to max it runs lukewarm. Cuts can live with this.

Basin upstairs, hot water temperature is reached, then it dips out then it will reach temperature again, gets very hot. It will run fine at about 75% again.

I had to repair the bath hot tap (grease and new washer). The bath hot tap seems to be running fine, no issues.

Thermostatic bar shower, the pressure on when this is used is extremely high, much higher than the taps. If it's run on max temp at about 60/70% it's perfect but if you increase the flow/pressure it will cool down. I said they could do with replacing it, it seems to make a strange noise intermittently. I have told them to see how things go when they move in.

When the hot water is running the return pipe also gets hot, about 10mm down from the return service valve, it's not going far.

There us no hw sensor, the hw works off the return sensor.

Is there anything else that could be causing this to run intermittently?

 

[armyash]

For anyone interested.

Solid red light on flow turbine.

Removed plate and cleaned out with descaling chemical. Got a bit of debris out but not the worst I've seen.

Replaced plate and tested. Kitchen hot tap runs extremely hot at about 75% flow, if I increase to max it runs lukewarm. Cuts can live with this.

Basin upstairs, hot water temperature is reached, then it dips out then it will reach temperature again, gets very hot. It will run fine at about 75% again.

I had to repair the bath hot tap (grease and new washer). The bath hot tap seems to be running fine, no issues.

Thermostatic bar shower, the pressure on when this is used is extremely high, much higher than the taps. If it's run on max temp at about 60/70% it's perfect but if you increase the flow/pressure it will cool down. I said they could do with replacing it, it seems to make a strange noise intermittently. I have told them to see how things go when they move in.

When the hot water is running the return pipe also gets hot, about 10mm down from the return service valve, it's not going far.

There us no hw sensor, the hw works off the return sensor.

Is there anything else that could be causing this to run intermittently?

 

[newcastle phill]

So you have a solid red light on the hall sensor all of the time during hot water. Amd you have good flow from the tap ?
Have you taken the turbine out and cleaned it.
Also have you cleaned the flow regulator and filter ?

Both thermistors should be
At 60 degrees"ish 2500ohm
at 85 degreesish 1000ohm

If they are wildly different then replace.

And at 75% tap opening its gas rating fine. And with the hot tap wide open its still gas rating fine - no drop off ?

Only other thing is tap max flow is more than the boiler can heat

 

[Stanios]

what descaler did you use? only real strong acid gets rid of all the crap i.e sulphuric
sounds like the plate is just blocked

 

[ShaunCorbs]

I would say more flow than the boiler can cope with

What kw rating is it ash ?

 

[Stanios]

I would say more flow than the boiler can cope with

What kw rating is it ash ?

Its 30 per thread title