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Old 01-09-2018, 05:22 PM   #1
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Default bb heater tsat troubleshoot

service call today for bb heat not working

heater is cold, turn up stat and heater comes on

pull from wall and find the line and load wiring is reversed (wired it correctly and reinstalled)

so I think, why does it even matter, its just a switch

so I guess when I turned up the stat I forced it on..then when it reached temp it would open

then with no power on the line side, it wouldn't make again as the temp fell?

like how did it ever work right?
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Old 01-09-2018, 05:30 PM   #2
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Maybe it was just stuck !
And your fiddling got it temperarily going again
If so / Then it will fail again
cause you didn't find the cause of the problem
replace the t stat would be a good start !
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Old 01-09-2018, 06:40 PM   #3
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let me ask this way,

How would a bb heater react with the thermostat wired with the line/load wires reversed?
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Old 01-09-2018, 07:04 PM   #4
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Quote:
Originally Posted by Jack Legg View Post
let me ask this way,

How would a bb heater react with the thermostat wired with the line/load wires reversed?
You have me curious now, I never saw the guts inside a line voltage thermostat - I don't know if there's just the coil like there is on a low voltage thermostat. If I had one on hand I'd crack it open and see. (I gave it a quick google but couldn't find anything.)

I thought it was just a switch and did not depend on the presence of the line voltage to close, in other words, I thought they would open and close with temperature even without power present.

If it's a bimetallic coil inside there, I could see how when you cranked it up you "un-stuck" it as @dmxtothemax said, and "fixed" it for the moment at least.

I could see them labelling the line and load side of a two-pole to make terminating clear, even though reversing line and load don't matter.
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Old 01-09-2018, 07:08 PM   #5
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For a typical cheap thermostat, it doesn't make the slightest bit of difference. It is indeed just a switch.
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