No pressure in Boiler

Joe Baeli

I would look form a leak somewhere . the water has to be going somewhere. You're dealing with a sealed system , should maintain pressure

Kenny_3

No Pressure in Boiler

I have a Gas Hot Water System-My pressure keeps on dropping. I manually fill to system every day to 15 psi-After a few hours it drops to 0 psi and the system won't push the heat upstairs. Could it be the Auto Fill Valve?

Tim P._2

If the autofill valve malfunctioned you would have street pressure in the system.

While there could be a problem the other way with the autofill (mechanism is stuck and not allowing water to enter the closed system), it probably cannot keep up with the demand for water.

The problem might be air in the system. Do you have an air separator? Do you hear air being expelled when you add water?

If the system is purged of air, I would definitely start looking for a leak.

What equipment is in your system? How are you making DHW?

Is the t&p valve blowing off?

Tim

realolman

wouldn't the

pressure on the street side of the auto fill be much greater than the boiler... so it doesn't seem the water would leak back through it. Seems it would almost have to be a leak.


I'm slow at everything.

amhplumb_2

2-issues!

You are losing the water somewhere. Issue-1: If there is no obvious leak showing up, is it possible that your pressure relief valve is piped to a floor drain or in some manner that you are not able to detect it discharging, if it is? If so, fill the system "manually" and fire up the boiler and watch the pressure gage and see if it climbs above 30psi (enough to cause the relief to discharge.) Your expansion tank could be flooded. If its not the relief valve, you have a leak somewhere. Issue -2 Filling the system "manually". You mentioned an Auto fill valve, why is it not filling automatically? Do you hear water running through it at all? The fact that you have to fill the system manually, says it is not working! However, the Auto-fill valve not working shouldn't cause the system pressure loss! But this issue needs addressed too. A system firing without water in can be dangerous and/or costly! Do you have a low-water cut off switch?