Boiler hissing when firing it up?

[theonejat]

Just switched the central heating on in my house and my boiler made a hissing noise for around 2-4 seconds, its a Remeha Avanta Plus and I've noticed in recent weeks that its not keeping its pressure, I can refill it fine but it will then drop back down, sometimes within hours. It's due a checkup but im not covered financially for any parts that may be needed.

Just wanted to know if this was a serious problem? If anyone knows what's up or could give me some help?

Many thanks in advance,

Jat.

 

[Anton]

Sound like an automatic air vent venting air/water. Best to get it checked out by a GSR engineer in case it's leaking inside.

 

[kris]

Call a gas safe registered engineer as you defo need it looked at by a profesional. Or put a post on here for one of the guys to have a look. Just make sure your not running it empty . Sounds like a press problem . Only thing u can do is make sure its topped up of water and let the engineer fix the rest. Good luck

 

[Dotty]

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