Fortic tank is overflowing

[Pipeandthings]

Fortic tank is overflowing,plumber replaced ballcock, no change. Came back and says immersion heater thermostat needs replacing? Water appears to be re-entering cold section via pipe from cold tank to hot cylinder, not through vent pipe. Water is warm in cold section. Any advice welcome

 

[ShaunCorbs]

Anything changed on the system?

 

[Pipeandthings]

Anything changed on the system?

No nothing new other than new ballcock which was told was the problem.

 

[exedon2]

Indirect fortic? I e water heated by boiler?
Some pics what you have may be useful.

 

[Pipeandthings]

Thanks. No, heated only by immersion heater. I haven't got any pics at moment .

 

[Pipeandthings]

Thanks. No, heated only by immersion heater. I haven't got any pics at moment .

Indirect fortic? I e water heated by boiler?
Some pics what you have may be useful .

 

[Pipeandthings]

I'm pretty sure water is coming back up the pipe connecting cold to hot section and overfilling tank. Don't understand why though.

 

[exedon2]

Got a shower mixer anywhere?

 

[Deleted member 120897]

I'm pretty sure water is coming back up the pipe connecting cold to hot section and overfilling tank. Don't understand why though.

Back pressure happening somewhere could be the cause. Basically cold pushing hot out of the way. Turn main stopcock off and see if overflow stops.

 

[Pipeandthings]

Got a shower mixer anywhere?

No. Only mixer are taps on kitchen sink. Wondering if that can cause issue.can crossover happen within body?

 

[Pipeandthings]

Back pressure happening somewhere could be the cause. Basically cold pushing hot out of the way. Turn main stopcock off and see if overflow stops.

Thanks. No-one seems to say thermostat is the problem which is what plumber said needed replacing. Will try main stopcock.

 

[Deleted member 120897]

Thanks. No-one seems to say thermostat is the problem which is what plumber said needed replacing. Will try main stopcock.

That’s because a thermostat is an electrical rod that enters the immersion heater assembly, naff all to do with any form of additional water. This isn’t your setup, but the image is simple enough to understand, where it states heater coil is where the thermostat would sit:

 

[Pipeandthings]

That’s because a thermostat is an electrical rod that enters the immersion heater assembly, naff all to do with any form of additional water. This isn’t your setup, but the image is simple enough to understand, where it states heater coil is where the thermostat would sit:

View attachment 77343

Thanks. That was my thoughts. I assumed if water was overheating cos of stat then it would come through vent pipe not as is. So for some reason increased volume in tank as you say.