I have a arcoleader boiler and when i turn it on it fires up the temp goes to around 180 pressure goes to 17. But then shuts down like its supposed to. but when i turn thermostat up boiler won't kick on I think it is the relay or somthing pleas help me don't have the money to call repair man.:wall:

Hi, I have a 1960's American Standard boiler that has two zones, one of which is not heating. Can also hear water running so believe problem is that system needs to be purged? Read alot of info but none of set-ups seem to be same as mine so looking for advice before I attempt. There is pipe coming out of top that goes to a pressure relief valve then a hose bib, between the two there is a old galvanized expansion tank. The supply side exits the boiler and Tee's to the two zones. The return lines each have a hose bib and gate valve, after they come together there is another hose bib abd gate valve. Then the cold water supply Tee's into the line before entering the boiler. On the cold water supply there is a red B&G? reducing valve. Thanks