HELLO!! This is my first post here, what a great site!! This might be more detailed than needed (or wanted), so if it is, please let me know :o Issue: One zone in my two zone home is currently not heating Background: I have lived in this home for two winters. This has happened both years. When it gets REALLY cold outside, my zone 1 (Living Room, Dining Room, and Kitchen) stops heating. Most of the season both zones work correctly, only when it get bitterly cold out that zone 1 stops working. Once the temp outside gets a little warmer, zone 1 will start functioning again. Climate/Home Construction: East Central Iowa (North Liberty). Currently outside it is wind-chill warnings ect, so it is very cold out. The home is a slab built (no basement) with a 4 ft crawl space underneath. Underside insulation on home has fallen down completely, pipes for heating are copper and they run in the crawlspace. The pipes are not insulated. Heating System: Gas fired, two zone, hot water baseboard heating. The boiler is burnham, the expansion pot is Amtrol, The zone valves are Synchron (V8043F 1036), and an Honeywell Aquastat Relay (L8148E) What I can tell about the issue: -Zone 1 thermostat is telling the valve to open, I can see the spring move when the thermostat tells it to. I cannot tell if the inner workings of the valve are functioning properly, but when I use the manual open on the valve there is still no resulting heat to zone 1. -When I opened the box to the aquastat, I noticed one side of the square relay thingy (sorry, girl talk) was broken. The unit is still making some contact on both sides. I tried holding it in place for fuller contact, and using electrical tape to do same, but no resulting heat to zone 1. -When the valve on Zone 2 opens, the water “drops” (I know that is not the correct term but not sure what to call it) and about a second or two later the boiler fires. When zone 1 valve opens, the boiler never fires. Any ideas? I am seriously baffled by this heating system. But, as a plus, I have learned a great deal about hot water heat systems :) Here are some links to photos of the system, and water flow ect. [URL="http://i748.photobucket.com/albums/xx125/Tryin2fixitlady/Heating/HeatingSystem005.jpg"]Valves[/URL] [URL="http://i748.photobucket.com/albums/xx125/Tryin2fixitlady/Heating/HeatingSystem002.jpg"]Overall System[/URL] [URL="http://i748.photobucket.com/albums/xx125/Tryin2fixitlady/Heating/HeatingSystem003.jpg"]Zone 2 on left, Zone 1 valve on Right (closest to camera)[/URL] [URL="http://i748.photobucket.com/albums/xx125/Tryin2fixitlady/Heating/HeatingSystem004-1.jpg"]Aquastat Relay[/URL]

We recently replaced our old steam boiler with a Peerless EC-04. We have been rapidly losing water over the past week. When the boiler is running we've had to add water every 2 to 3 hours. We do not see any leaks in the boiler. We have replaced main valves and the valves to the radiators. Still losing water rapidly. We filled the boiler with water up to recommended level in site glass and kept boiler cold. We notice the water level still going down in the site glass to the level of the hartford loop. What does it sound like is going on here? We are ready to possibly replace the return lines but want to make sure that we have not missed anything else.