Boiler requires reset and air in system

[John C841]

Hi

My conventional boiler a Greenstart Ri has started shutting down occasionally. Usually in the morning it won’t come on until it’s reset. It’s done this a handful of times in the past couple of months, normally when it’s frosty.

I have noticed it ejects quite a lot of water from the siphon. There is a gush every few minutes (when working “fine”) but I also see air in the system as I frequently have to bleed a couple of radiators. I don’t see any leaks.

I am going to get it serviced but just wondered if anyone has any ideas about what this could be so I can brace myself.

 

[vxxbcks]

Anything that aerates the water is un-good. Likely there is a blockage near the pump (on the low pressure side, often where the cold feed from the tank joins the flow from the boiler). System probably needs cleaning and if it doesn't have one, a magnetic filter added.

 

[John C841]

Thanks.

Would that also explain the regular water burst from the siphon or is that normal? My understanding is that is just for condensation so lots of water seems odd.

It’s all micro-bore to the radiators, I expect it does need a good clean. There is no magnet filter.

 

[Razor900]

The siphon is designed to do that to reduce the likelihood of the pipe freezing if outside

Does the boiler light with a bit of a bang?

 

[John C841]

Nope sounds great. When it fails to start I think it’s the attached error.

 

[vxxbcks]

By syphon do you mean the plastic condensate pipe to outside?

 

[John C841]

Yeah.
It goes in to a drain pipe outside that’s not enclosed so I can see the water (and steam when it’s frosty)

 

[vxxbcks]

That sounds like it’s working normally. The condensate is a result of burning the fuel efficiently.