Combi Boiler Pressure Rising

captaincaveman · 16 Jul 2010

Hello,
I have a worcester bosch combi boiler which is about 10 years old, no matter how many times i bleed the radiators the pressure slowly creeps up again!
Your thoughts gratefully received.
Many thanks.

kevplumb · 16 Jul 2010

first check the filling loop is disconnected

View media item 11214

ianniann · 16 Jul 2010

If it creeps up gradually whether the boiler is on or off, then the filling loop is passing a small amount of water.

If it goes up too much when the boiler is on, the expansion vessel has run out of air.

twgas · 17 Jul 2010

Some worcesters have an internal filling loop so you may not have one like kevplumb's.
It is possible that the HW heat exchanger has failed, some worcesters have a single, dual flow type and some use a secondary one.

adlplumbing · 17 Jul 2010

op what type boiler is it

daneski88 · 17 Jul 2010

adlplumbing said:
op what type boiler is it

It's gas

captaincaveman · 17 Jul 2010

ianniann said:
If it creeps up gradually whether the boiler is on or off, then the filling loop is passing a small amount of water.

If it goes up too much when the boiler is on, the expansion vessel has run out of air.

when i disconnect the old filling loop, can i expect to lose a lot of water from the boiler end?

adlplumbing · 17 Jul 2010

turn your stop tap off first then disconnect the turn stop tap on little and see if water comes out

adlplumbing · 17 Jul 2010

daneski88 said:
adlplumbing said:

op what type boiler is it

Click to expand...

It's gas

could be eletric

PEDANTICVINDICTIVEMAN · 17 Jul 2010

captaincaveman said:
ianniann said:

If it creeps up gradually whether the boiler is on or off, then the filling loop is passing a small amount of water.

If it goes up too much when the boiler is on, the expansion vessel has run out of air.

Click to expand...

when i disconnect the old filling loop, can i expect to lose a lot of water from the boiler end?

Only if the non return valve is faulty and not shut itself off, which can happen.

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Combi Boiler Pressure Rising

daneski88

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