Baxi Platinum Combi boiler Relief valve lifting

[gibss3]

My Baxi platinum combi is 4 years old but I never sent the 5yr guarantee away after instillation, and you guessed it now i have a problem.

When the central heating is turned on the rads heat up as normal but the pressure gauge indicates the pressure continues to rise up to 3.0bar. I can then observe water dripping from the Relief valve outlet.

After probably 5 mins the drip stops and the pressure remains high but static, the boiler continues to operate until the timer turns off and then the temp/pressure drops below 0.5bar (low system pressure error code E119) I then wake up to cold house because the boiler requires re-filling. I normally re-pressure to 1.5bar and run my CH on max up to 80-86 DegC.

Would be grateful if anyone has any ideas on why my boiler is over-pressuring before I start wasting money on non-refundable parts? I'm not a heating engineer but have an understanding of heat transfer and engineering safety design.

There are no other symptoms to speak of and I have no problem with HW/CW

 

[gedenve]

I think there is some short on your boiler. It is better that you'll have an electrical plumber to solve the issue.

 

[fixter1]

id say your expansion tank,, could just need rechargeing,, check for blockage in the pipe to the ev if they fail to fix it .. your tanks shot......also i would change the prv

 

[PlumbBobBob]

try just charging to 1 bar and see if that helps

 

[BLOD]

try just charging to 1 bar and see if that helps

I'd do this too, before spending any money on parts etc.

 

[fixter1]

I'd do this too, before spending any money on parts etc.

i agree

 

[Nat]

Sounds like your expansion vessel has either lost its charge or the diaphragm is split. Could be a quite simple recharge or more complicated exchange. When water heats up it expands. If there is no where for the extra volume to go (usually expansion vessel) then the pressure will climb to 3 bar and then you prv will open to let the pressure out. This is why when it cools down the pressure is low-you have lost water out the prv. Get a gas safe registered plumber to have s look at it.

 

[Billy Bob Bob]

as above

 

[SimonJohns]

Expansion vessel

 

[gaspastemania]

get your hands in your pocket and get new boiler

 

[Billy Bob Bob]

get your hands in your pocket and get new boiler

why?????????????????????????????????????????????????????????

 

[gaspastemania]

being sarcastic

 

[Billy Bob Bob]

sarcasms a form of wit you know:wacko: