Lukewarm water from cylinder

[kungfuslippers]

Hi

I've got a problem with a cylinder (below) that only seems to produce lukewarm water :

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• kungfuslippers
• 14 Jan 2015
• 1

The water pipe going into the cylinder from the boiler system (shown below) is red hot when the hot water is switched on :

Untitled

• kungfuslippers
• 14 Jan 2015
• 1

But the pipe at the top of the cylinder is only lukewarm to touch :

Untitled

• kungfuslippers
• 14 Jan 2015
• 1

I'm not DIY expert but know for sure that we don't have a combi boiler. Its a conventional boiler I think.

The water has been lukewarm for about the last week. I used to keep the thermostat on the side of the cylinder at about 55 degrees. Turning it up to 65 has made no difference.

Has anyone got any ideas about why my hot water would be lukewarm ?Radiators are hot. The pipe into the cylinder is hot so I don't think its a boiler / 3 way valve. Its just the water out that's the problem.

Thanks

 

[picasso]

Is the overflow from the tank in the loft running? and has any one touched the red valve at the bottom of the cylinder ? (right hand side)

 

[kungfuslippers]

Is the overflow from the tank in the loft running? and has any one touched the red valve at the bottom of the cylinder ? (right hand side)

No one has touched the red valve.

How do I check if the overflow tank is running....?

 

[picasso]

There will be a pipe coming out probably near the roof and the water will be running out of it, normally hard to miss, if your still unsure go into the loft and you will hear the tank filling even when you havent used any taps ect

 

[kungfuslippers]

There will be a pipe coming out probably near the roof and the water will be running out of it, normally hard to miss, if your still unsure go into the loft and you will hear the tank filling even when you havent used any taps ect

Do you mean the tank should be filling constantly or only when the heating is on ?

 

[newbuildinstaller]

Cyl stat broken/turned down

 

[Nige F]

Is the pipe with the red valve hot ?

 

[kungfuslippers]

Is the pipe with the red valve hot ?

Not sure - will check this evening....

 

[kungfuslippers]

Cyl stat broken/turned down

I guess its possible that the stat isn't working properly. As I mentioned above the temperature had been set to about 55 and turning it up to 65 didn't make a lot of difference....

 

[RigidRaider]

What about that motorised valve (grey box on the right)?

Turn on the boiler then turn the cylinder 'stat down, then up and listen for a zzzzz sound as the synchronous motor opens the valve to admit pumped water into the coil. If nothing happens the motor may have died, which is common enough and easy to fix. See Google for instructions.