Manual Worcester-Bosch Greenstar 2000 - GR2301iW (page 17 of 24) (English)

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Greenstar 2000 – 6 721 839 343 (2023/04)

System gassing

WARNING

If you suspect the heating system is gassing, you must exercise

caution when carrying out testing or remedial work as the gasses

produced can be flammable.

Do not vent air from radiators whilst the central heating is switched

on. Allow 30mins after venting the radiators before using the

central heating or hot water.

▶ Whilst venting radiators, do not allow the pressure on the boiler to

drop below the point at which it is normally set.

▶ If the system is to be drained, the boiler must be electrically isolated.

CAUTION

If system pressure is repeatedly increasing, even when the

appliance is not operating, you should first check that the filling link

is fully closed and confirm that it is not passing. If radiators are also

not heating to the top of the panels and repeatedly need venting, the

heating system may be suffering from gassing. This is an indication

that corrosion is taking place and requires the system being cleaned

and treated to BS7593.

▶ This should be confirmed by taking water samples to check pH levels

and turbidity.

▶ Failure to properly maintain the heating system may result in damage

to the system and appliance, and may affect the boiler warranty.

Table 8 System gassing flow chart

Is your system pressure constantly increasing even when the boiler is off for extended

periods of time?

 

NO YES

 

Does system pressure increase

when the boiler is on?

Have you confirmed that the filling link is not

stuck open/passing water in any way?

YES YES

 

   

NO NO Does the problem

persist?

  

Is your system pressure regularly

dropping (i.e. you constantly have to

top up your boilers pressure)

Does system pressure increase above

2.5bar or enter the high pressure red

zone (Max operating pressure) on the

pressure gauge/display?

Confirm the filling link is closed

and check that the Plate Heat

Exchanger is not cross leaking

 

YES NO



The boiler

is fine

   

Plate heat exchanger leaking?NO YES NO YES

   

The boiler

is fine

Does your Pressure

Relief Valve

regularly drip?

The boiler

is fine

Is the Expansion Vessel

pre-charged higher than

expected?

  Replace Plate Heat

Exchanger

NO YES 



    Do the radiators have to be

regularly vented?

NO YES NO YES 

   Most likely a cross-leaking

component in the boiler.

Further investigation

required

Check the CH

system for leaks

Check/replace

Pressure Relief

Valve

Is the Expansion Vessel

pre-charge too low?

 

YES NO 



  

NO YES 

  Corrosion is probably occurring within the heating

system which is causing system gassing.

The system should be cleaned and treated to comply with

BS 7593

Check Expansion Vessel is

sized correctly for the

system

Repressurise the

Expansion Vessel

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Worcester-Bosch Greenstar 2000 - GR2301iW Manual

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