28 I Wocester Combi high pressure

[iazaman]

Hi all,

I have 28 I wocester combi showing 3 Bar on he gauge. Doemstic water is OK, just CH not operating due to high pressure.
Before i call eng out, i like to know if anyone else had a samilar problem.

Thankd[/quote]

 

[Agile]

The high system pressure will not stop the CH from working!

Is the filling loop closed?

Have you tried bleeding a few litres od water out of a rad?

Tony

 

[kevplumb]

make sure the fill loop is off

bleed a rad to lower the pressure to 1 bar

watch the pressure does it rise ?

turn off water run a hot tap does it start falling

drat you type fast agile

 

[iazaman]

make sure the fill loop is off

bleed a rad to lower the pressure to 1 bar

watch the pressure does it rise ?

turn off water run a hot tap does it start falling

drat you type fast agile

Thanks all for a qyucik relies:

The loop is turned off, I have bleed the radiators and drained system to get pressure to 1 bar.
Running the hot water does bring pressure down by ,25 t0 .5 bar but when water is turned and boiler switches off. The pressure jumps back up to just under 3 bar so the gauge needle settles at start of the red mark.

 

[iazaman]

make sure the fill loop is off

bleed a rad to lower the pressure to 1 bar

watch the pressure does it rise ?

turn off water run a hot tap does it start falling

drat you type fast agile

Thanks all for a qyucik relies:

The loop is turned off, I have bleed the radiators and drained system to get pressure to 1 bar.
Running the hot water does bring pressure down by ,25 t0 .5 bar but when water is turned and boiler switches off. The pressure jumps back up to just under 3 bar so the gauge needle settles at start of the red mark.

PS. Kev: when i run the hot water and turn off the water supply. the pressure does not drop and no water comes out-off the hot tap (I assume means the hot water and CH water have not broken into each other in the boiler system.)

 

[bellairaphon]

heat exchanger split easiest way is to isolate the cold inlet to the boiler and drain down. then un isolate the boiler and see if it starts to pressurise

Nath