[cj2009]

Greetings all,

This seems like a great place to start! Here's my problem:

Just bought a house, which is heated via an oil furnace and hot water baseboard heaters. There are 3 zones, whereby 2 are controlled via Noma thermostats. So far, so good (no problems with zones 2 and 3, which are the 1st and 2nd floors). In the basement however (zone 1), I replaced the old thermostat with a new Noma 5+1 thermostat (same as the others) because all of this time, the basement has always been hotter than the rest of the house, regardless of how far to the left I was turning the thermostat dial. Funny thing is, even now with the new thermostat, no matter what I set the temperature to (i.e. 10 degrees celsius), the basement is still hot and the baseboard heaters are hot to the touch when I go down there. It seems that I am burning a lot of oil so far this winter, which is odd because we keep our house between 15-17 C. I don't care about heating the basement and seemingly the thermostat control is not the issue. I read a few postings on this site and I'm leaning towards replacing the one zone valve (perhaps it is stuck)? Has anyone encountered this issue? Should I try to fix the zone valve first or given that this system is somewhat an older system (10-20 years is my guess), just replace the whole valve?

[cj2009]

Oops, fogot the following details:

- Basement is at 21 degrees, versus the 10 degrees on the new thermostat. Rest of the house is set to 15-17 degrees and is OK.
- when I replaced the thermostat, I tested the communication to ensure that it was working, whereby when I cranked the temp. to 25 degrees, the boiler started and "heat" flashed on the screen of the thermostat.
- When I touch all 3 pipes coming from the boiler (with the zone valves), they are all hot to touch..

[hvac1000]

It is possible the basement zone valve is stuck open this does happen but not that often.