Hello, I've spent the last 2-3 hours reading threads on this forum and attempting to troubleshoot a lack of heat in one of my three zones. There's a lot of information on here, and through reading other posts, I've tried to learn the basics of my heating system and do a few basic troubleshooting steps but am not sure what to do next. Maybe some of the helpful and knowledgeable posters here can help or at least point me in the right direction: Basic Setup: Natural Gas Boiler (hot water) with three heat zones. Each Zone has a Taco 007-F3 circulator. Heat is fine on the upstairs and downstairs zone, but the third zone is a den that hangs off the side of the house - no heat there. There's, one other detail to mention. I only have one switch relay in my entire setup. There's a sr501 One Zone switching relay is Labeled "Den". The other two zones don't seem to have an equivalant piece of hardware, which confuses me slightly. It looks like the previous owner of the house added this zone and the switch relay after the initial installation of the boiler. For the other two zones, the wiring from the thermostats appear to terminate in the boiler itself. The den is the zone that has the heat problem. Tried the following: 1) Changed batteries in the thermostat. 2) Attempted to feel if the circulator is running, but it's hard to tell if it is or not. Circulator is installed on the outflow (hot) side of the boiler. Pipes to this zone leading away from the circulator are not very hot. 3) Blead water out of the valves on the two baseboard heaters in the den. Didn't seem like there was any air in there. 4) When I look at the sr501 One Zone switching relay Labeled "Den". The Power light is on, but the Zone1 light is not illumintated when I turn heat on the thermostat. Seems like this is the problem, so I'd guess that the issue is either the switch relay or the thermostat. 5) I removed the thermostat facing and used a wire to bridge the two connections that the thermostat manual suggests. And, Viola!, the Zone1 light comes on on my switching relay, but 30 minutes later, and the baseboards in my den haven't started to heat up. 6) all other diagnostics for the boiler seem to be ok. PSI is about 22 psi, water temp on the gauge is close to boiling, and I'm getting heat on the other two zones. What to try next? Thanks Matt

We are selling my mother's Montreal house. It is empty and I visit it every 2nd day or so to make sure things are ok. It has a gravity fed, oil fired, hot water heating system. To save money I have turn the heat down to 15C. I wanted to turn off water supply to house (just in case a pipe burst) but was concerned if I can when I have a hot water heating system. Can I turn off the water and still run the furnace?