Cast Iron Radiators cold when boiler is on

Derrick6

I've got an older house with cast iron radiators & a boiler system. Turned it on last night, I could hear it running but the radiators throughout the house were all cold, not warm like usual after the system is started.

A few years back I had to replace the damper & relay & things were working good.

I didn't bleed the radiators before I started the system up this year & I don't enough to diagnose the problem.

I'm living on a pretty low budget and need help figuring this out.  I'd certainly appreciate any ideas you'd have helping lead me to some answers.

Derrick

mikeapolis

I'd start by seeing how much water you have in the boiler. Hot water or steam? If you could take some pictures of the pressure/temp gauge that'd be great.

Jamie Hall

Well, for starters, is this a hot water system or a steam system? Possible reasons for the radiators not heating are very different between the two.

Also, I presume that the boiler is, actually, firing? You've gone to look and see and it has a good flame? Hearing isn't necessarily helpful, as there are often big blowers which are what you actually hear.

Robert_25

If the boiler comes up to temperature as expected, you have a circulation problem.  The system may be air bound, or the circulator may be stuck.