oil furnace one zone working out of 2

Old 03-07-07, 03:52 AM
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oil furnace one zone working out of 2

we have an oil furnce and the first zone downstairs works and the second floor upstairs does not work - no heat on the second floor and heat on the third floor. we have 1/2 of a tank left if that makes any dirrerence. What should i do ? do i replace the thermostate on the seond floor first or someone said because it is two zoned, it could be the coils, what ever that is. we do have a service contract but that may cover the coils and not the thermostate and we have to pay for a service call. can anyone make any recommendations ? thanks in advance. we live in the east and are having a cold brrrrrrrrrrr snap. thanks
Old 03-07-07, 05:23 AM
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If you have three thermostats, then you have 3 zones, unless one thermostat is disconnected. If you have electronic thermostats, then change the batteries in the 2nd floor one. Other than that it most likely isn't a thermostat problem. Does your furnace is zone valves or circulators to run each zone? There should be one zonevalve or circulator for each zone, to help you find out. Remember, if its really cold where you are, it might be better to call a heating company because most heat pipes run along/in the outside wall and it gets very cold there and bad things might happen.
Old 03-07-07, 09:14 AM
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Take the t-state in question. Disconnect the wires (that lead into the boiler in case you also have A/C or something else on the t-stat) inside the t-stat and touch them together. The boiler should supply heat to that zone. If it does, then the t-stat is faulty, if it doesn't it's not your t-stat.

Usually with hydronic systems, when you don't have heat, the forst thing you want to check is that the path of flow for the water is working.

No air locks in the piping

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