Glowworm flexicom CX, no fault code but not up to temprature on hot water?

[alastair]

I have been called out to look at a job where the customer has insufficent hot water from there bath tap, they can increse the heat in the bath tap (built in the wall mixer) by opening the cold on there basin while running a bath. After checking the other hot outlets I belive the hot is not getting to temprature. I have turned the hot water temp up on the boiler but when it reaches the outlets its hot enough to keep your hand under not what you'd expect. Don't no if anyone has any ideas? i'm a bit stuck on this one and dont no what to try next help please?

 

[R1CKY]

Hi Alastair, we can't give out boiler repair advice on an open forum. If you are Gas Safe Registered, PM Gas Man or Redsaw your details and they'll help you gain access to the private Gas Safe forum, in which we'll gladly give you advice.

 

[Barry98]

As r1cky has said send your details over and we can help you more

 

[Barry98]

but for now we will let it run , am sure you understand

 

[buckley plumb]

could be faulty thermostat in mixer or a passing mixer

 

[alastair]

thought that but there is 3 shower/bath thermostatic blending valves built into the walls and all three are not heating up as youd expext? what do you mean passing mixer?

 

[Barry98]

alastair now you have your badge im moving this into the private forums just incase and we can be more open in there

 

[buckley plumb]

thought that but there is 3 shower/bath thermostatic blending valves built into the walls and all three are not heating up as youd expext? what do you mean passing mixer?

will explain more when this is moved to private section

 

[Barry98]

will explain more when this is moved to private section

already moved fell

 

[buckley plumb]

turn cold iso valve off under boiler then turn on any hot tap if you get flow then there is a mixer tap or shower valve crossing cold water to the hot which would blend the boiler hot water eg ( when boiler on would be drawing half from boiler half from cold through mixer ) worth a try . other fault could be blocked plate and diverter - run hot tap and feel htg flow pipe it should not get hot if it does the plate is blocked or diverter faulty - went to one before xmas and it needed plate / diverter and pump over £400 of parts but glowworm come out for £260 and fixed and replaced all parts for that price worth using at times

 

[R1CKY]

Not familiar with this boiler. But what is it doing when you run the hot tap? Does it fire up and stay lit? If so, you need to either check the burner pressure against the DHW max pressure on the data badge or gas rate it and check the heat input against the max DHW input on the badge. If either come out a great deal below the maximum, you could have a thermistor fault.

If you do have near enough max pressure or heat input, the heat is going elsewhere, most obvious cause would be heat tracing into the rad circuit through a faulty diverter valve.

If the boiler is firing up, going out, relighting, going out, etc. It can't get rid of the heat fast enough, either caused by a thermistor giving false reading or an obstruction in the plate heat exchanger.

 

[alastair]

Thanks everyone some good ideas all round there, will get back there this week and try them out, fingers crossed will have a anwser, the appartement has had other problems with crossed pipes like the toilet was filling with hot water so hope its nothing like that as its all boxed in and tiled will be very messy. Thanks again!!

 

[arran197]

Could be a passing diverter valve. If you have the heating off before going to the job, run the tap and hold the ch flow pipe. If it gets hot, you diverter is passing.