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CARL7480 02-12-2008 01:14 PM

Please Help No Heat In Upstairs Radiator Downstrairs Is Fine
My temporary fix has been to force water into the furnace and bring it to about 11psi. I then bleed the radiators until i get water. This works for a few weeks or so then I lose heat agian. It seems that i lose water and pressure. I have no leaks in the house. Its a small area 800 sqft to heat so its not a big system....any ideas or advice/help would be great!!!!

Thank You

redline 02-12-2008 02:16 PM

How old is the expasnion tank?
The furnace should "fill" on its own.
Do you bleed the system?

CARL7480 02-12-2008 02:39 PM

the first time this happened i emptied the whole system (nasty black water) and refilled. the tank i dont see a date on there i have been here 4 years so its at least that old.

redline 02-12-2008 02:41 PM

What is the PSI reading on the gauge at the boiler?

CARL7480 02-12-2008 03:57 PM

Right now the pressure is 4-5 psi

chris75 02-12-2008 04:05 PM


Originally Posted by CARL7480 (Post 97371)
Right now the pressure is 4-5 psi

I would say you need at least 12-15psi to make it to the second floor, do you have an autofill installed into the system?

Marlin 02-12-2008 04:38 PM

The boiler should maintain 12-15psi as has already been stated. Your fill valve is probably broken. Manually raise it to 15psi and see if that helps.

CARL7480 02-12-2008 05:58 PM

that does help for a few weeks then this happens again....i guess i can change the valve this do i know if it is the circulator pump ? I cant tell if it is working or not...

Marlin 02-12-2008 07:34 PM

The circulator pump has nothing to do with the pressure which we have already established is your problem. Go to your local plumbing supply and get yourself a new fill valve. I recommend against Home Depot, Lowes, or any other big box stores. They tend to go for the cheapest stuff they can get there hands on.

biggles 02-12-2008 07:37 PM

if the circulator pump isn't running you won't have any heat and the boiler would be satisfying itself on the limit due to the water not being circ'd.the pump should run when the stat calls motor should be warm to hot(depends on location around boiler)i am thinking you have a steam boiler not a hot water boiler...with loosing water and pressure but no leak?

Marlin 02-12-2008 07:39 PM

Ok, hold everything for a minute.
I assumed this was hot water. If you have steam ignore the previous advice, you have a different problem.

Marlin 02-12-2008 07:41 PM


Originally Posted by biggles (Post 97449)
i am thinking you have a steam boiler not a hot water boiler...with loosing water and pressure but no leak?

Hot water boilers do loose water and pressure over time. I'm not sure exactly where it goes but if you shut off the supply to any boiler usually in a few weeks the system is going to be low. A new system can probably go a couple months but it will eventually get low.

CARL7480 02-12-2008 08:22 PM

yes it is a hot water heating system....should i still replace the fill valve...that was the same question i was asking myself where is the water and air going ?

biggles 02-13-2008 04:45 AM

are you setting one stat for the whole house?the relief on the side of the boiler is it wet on the inside of the copper pipe(blow off) or right inside the brass fitting

CARL7480 02-13-2008 07:46 AM

Yes just one thermostat for the house sorry im not that good at these types of things ..when you say relief.. is that the spicket on the side at the bottom that i use to fill the furnace with water ?

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