Pressure on oil furnace keeps getting too high so can somebody help me and tell whats the problem?

I had changed pressure valve, expansion tank all the cold water are open, It seems that not enough water gets supplied in the furnace.


all the pipes make noise until pressure is regulated manually.Pressure on oil furnace keeps getting too high so can somebody help me and tell whats the problem?
do you mean you replaced the pressure relief valve,,or the water pressure regulater [fill valve].....i think you meant the relief valve [30psi..? ].....also,did you replaced the expansion tank or just make sure the valve to it was open.....if you have the old style exp tank it needs to be drained..the old style is large,holds about 15-20 gallons,usually mounted at the ceiling above the boiler somewhere in the basement ..its not enough just to turn the shutoof valve off and the drain valve open...you have to introduce air into the tank to break the vacuum created by the water leaving,otherwise you get very little water out and think its empty..to introduce air,,you need to open or remove the bleed port/plug on the drain valve [ if it has one] while the drain valve is open...if no bleed port exists on the drain valve or elsewhere on the tank,,then look for a union in the inlet pipe between the shutoff and the tank,,open the union while drain valve is open....if no union exists then you have to leave the drain valve open with hose attached for a long while,usually the water will eventually gurgle out while air goes in in spurts.........if you have the newer type exp tank,,compact,capacity of around 2-4 gallons,,you should just replace it....the relief valve may have just been doing its job,,although old relief valves often dont reset , [ re-close], after opening.....after all is done,,pressure in system should be around 12-15 psi,,whether regulated by auto-fill valve or by you manually....hope your problem was related to this,,i didnt fully understand the question......i assume you have a hot water boiler..........danPressure on oil furnace keeps getting too high so can somebody help me and tell whats the problem?
Even a new furnace of this type has it's problems.


You will have to do it manually.


Actually you have to much water going into the system.


Do you have a glass tube on the furnace showing water.


This should show half full.
It sounds like either the air eliminator is not doing its job or the new expansion tank was not charged with air when it was installed.