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Posted by on April 6, 2007, 12:33 am
Is there any way you can get your hands on another thermostat just to
test it? Or just buy a new one....
Anything is possible, but it does sound like a thermostat problem to
me. If the thermostat is a modern digital type, they can get flakey.
Of course be sure the batteries are good. If it's the old Honeywell
type with the mercury bubble inside, they MUST be level, but the
contacts may be failing, and of course, make sure the mercury did not
separate (unlikely but possible).
wrote:
>On 5 Apr 2007 19:25:23 -0700, mflint38@hotmail.com wrote:
>
>>I have a old boiler furnace. I'm having an issue where the boiler
>>periodically wont come on and the house temperature will continue to
>>drop. If I turn the thermostat up, the boiler will kick on and will
>>maintain the set temp for some time but will eventually fail to kick
>>on again.
>
>And then to get it to go on, you turn it up even higher, or you turn
>it down and turn it back up again? Or do both work?
>
>> Based on the fact that I can get it to kick on by
>>adjusting
>>the thermostat, I'm assuming the issue is thermostat related but I'm
>>not sure if the thermostat itself of the sensor
>
>OR the sensor? The sensor in the thermostat, right? I might, but
>very few people would try to repair the thermostat, so if you mean a
>sensor in the thermostat, you might as well replace the thermostat.
>
>...or maybe I''m
>>totally off base.
>
>Another way to verify this is to note that that the thermostat
>connects two wires together. You can take the stat off the wall, and
>if you figure out which two wires they are, you can touch them
>together and see if the boiler goes on immediately. If you only have
>two wires (no AC) it will be easy to tell which two wires they are.
>
>When the stat is totally disconnected, you can also use an ohmmeter on
>the matching screws of the thermostat and see if the stat goes from
>infinite resistance to near zero resistance as you adjust the
>thermostat near the room temperature.
>
>It's possible that the stat works but is wrong as to temp. If that is
>the only problem then you could just learn to add 3 degrees or
>whatever from the setting you have it at. This is especially relevant
>to my first question above. If you turn the stat to warmer, say to
>76, but later on turn it back down to 70, the house might get down to
>66 or 67, because the stat is miscalibrated and it thinks 66 is 70 and
>67 is 71. If that is the case, just set it to 74, and it won't think
>it is 74 until it is actually 70, which for this example is what you
>want.
>
>Also, make sure the thermostat isn't getting a warm air breeze or a
>lot of sunlight, so it's warmer than the rest of the house. Normally
>they are put where this won't happen, but who knows.
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