Boiling Water in F&E Tank

[wild nomad]

Hi There,

A customer has an F&E tank that is practically turning into a kettle when the heating comes on. She also has complained that the hot water is scolding! Other than a dodgy boiler thermostat, does anyone have any ideas what could be causing this?

Thanks in advance 🙂

 

[missplumb]

air locks, faulty 3way valve, is the heating working

 

[Simon F]

is it pumping over?

how hot is the water?
how long is it set to be on?
immersion heater left on 24/7?

more investigation required.

 

[wild nomad]

air locks, faulty 3way valve, is the heating working

Heating working fine.

 

[wild nomad]

is it pumping over?

how hot is the water?
how long is it set to be on?
immersion heater left on 24/7?

more investigation required.

is it pumping over?

how hot is the water?
how long is it set to be on?
immersion heater left on 24/7?

more investigation required.

Haven't been around to look yet I just wanted to go armed with some ideas as I can't touch the boiler as I'm not Gas Safe yet. Can't say how hot the water is but apparently the last engineer said it had warped the first 6 inches of the overflow pipe as it exited the F&E tank. So pretty damn hot! No immersion heater. The heating is working fine so no air locks below the highest rad and they haven't complained about rads coming on when the heating is off so I'm assuming the port valve is OK.

They have recently had their F&E and CWSC replaced about 3 months ago and apparently problems started about 3 or 4 weeks after the install. When I fitted a shower there I looked at the new water tanks installation and it looked fine to me. All up to building regs. Will check to see if it's pumping over when I get there.

Cheers for the ideas!

 

[Chalked]

It will be down to the configuration of the feed and vent, where they are connected in. And pump position.
For a quick fix, try extending the vent as high as possible. Drain some water out of the f&e tank and lower the water level Dow to about 1/4 of the tank depth.
if this doesn't work, a bit more investigation is needed.

 

[Rickster123]

S-plan with no bypass fitted? Or a closed bypass?

 

[wild nomad]

S-plan with no bypass fitted? Or a closed bypass?

Its a Y plan. Not sure yet about the bypass.

 

[jtsplumbing]

If its getting that hot it needs sorting pretty quick B4 someone gets scalded