glow worm express 80

[zebb100]

Hi, have got a glow worm express 80 boiler, the hot water is fine, when switching to central heating the presser rises from 1.5 bar to around 3/4 bar then the boiler/pipes make a loud banging noise before the boiler cuts out, the boiler also makes a boiling/kettle sound as the presser is riseing,the boiler ia around 15 years old. just wondering if its a new boiler time or a fix job to keep it running for a few more years

 

[stumpydick]

it is at the end of its designed lifespan. an engineer would check that the boiler was modulating properly, ie reducing its power output as temp. in ch. increases. could be a sensor or an expensive gas valve problem.you need an expert, or more sensibly, new boiler + expert installer.

 

[zebb100]

Hi, thanks for the reply, thought it mite be old age getting to it,
ill start priceing up haveing a new one installed.

 

[twgas]

could be pressure vessel needs recharging - if it dumps water out PRV then boils due to lack of water. probably will need a new PRV as well

 

[mickyg]

heat exchanger blocked. expensive part, get a new boiler.

 

[namsag]

long time since i saw an express so just a thought on what it maybe.
Some combis only use the pump on CH and not on HW .
So if the pump has jammed then when CH was demanded boiler would quickly heat up causing thumping and banging and pressure to rise due to expansion.
So check pump is spinning

 

[Deleted member 105431]

good boiler and many still in action. call glow worm 01773 828100 for a fixed price repair £215

 

[zebb100]

Hi, thanks for all the replys , i dont know if this any more info, when i run the hot water then switch the heating on the boiler dosent raise in presser, as soon as i turn the water off ( hot tape in kitchen ) the boiler starts to raise again, ill have to wait to monday to get a long screwdriver to get the pump cap off to check its turning