Heating Engineer First time ive seen this happen

[Antric]

Hello people as title says im a heating engineer

tonight i have looked at a system that im struggling to diagnosis

heres the strory

i changed the raditor (downstairs lounge) 3 weeks ago left it all working lovely
Customer phoned a couple of days ago to say he kept having to bleed one of the upstairs raditor and there was a lot of noise from the system (air moving about)
so i looked and was supect of a Auto Air vent in the loft as it is in the loft with the mid postion valve and pump and its right before the pump.
so it was late so i had him booked for wednesday so tonight i get the call to say its overflowing so on inspection tonight whenever you turn on hot water and heating the water level starts very slowly rising in the tank like 10 mins to reach the overflow.

so could this really be air being sucked in from the aav or am i missing something

 

[Billy Bob Bob]

sounds like a split coil in the cylinder

 

[BLOD]

does it actualy overflow from the f & e tank ?

 

[Alpha man]

Agree with Gasman.

 

[gaspastemania]

Condemn it as a dangerous contorls etc and slam in a combi ,,,cheeky little pay packet before crimbo 🙂

 

[moogwai]

agree with gasman....had a similar job a while back.

 

[Antric]

I don't think it's the coil because it doesn't overflow when heating and hot water is off

 

[Billy Bob Bob]

I don't think it's the coil because it doesn't overflow when heating and hot water is off

what if the coil only leaks when it expands?

 

[Antric]

Possibly There on the immersion for the night I still think its possibly a A a v that's causing it think il try swapping it tomorrow and then see if it works

 

[Best]

Possibly There on the immersion for the night I still think its possibly a A a v that's causing it think il try swapping it tomorrow and then see if it works

I have had a problem with a neighbours heating that was filling full of air & air locking 3 rads. Discovered that a.a.vent fitted on end of return pipe to rads ( by a plumber idiot ) in attic was sucking in air while system going. They are not even necessary, as manual vents fine. Worth checking them, but not sure about water rise in exp tank.

 

[tamz]

How high above the pump is the expansion tank, how is the F&E piped and what is the pump set at?

 

[Antric]

I manged to sort the problem it was the A a v that was Drawing air in

 

[GasmanxxxR1]

Nice to see a happy ending mate