Quote:
Originally Posted by bill_covert
Ok Sundancer how is that done I'm all thumps sometime lol just been learning a lot from you guys on the site so fill me in sir and I didn't see that on google either lol
thank you again what wealth of knowledge here.
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A little explanation of them, they are a bi-metallic switch that is activated by heat and cold. The bi-metallic fingers of the switch are dissimilar metals, allowing one finger to open or close before the other one. These guys are NC or normally closed to allow the heater to heat the water to the set temperature and when the water gets hot they open and shut the burner off. That's the basic idea for them.
Looking at the switches straight on you'd remove the wire that comes from the control board and simply touch it to the other side of the switch. If it works the ECO is open, or bad. If that doesn't do it you can touch the control board wire to the far or left side of the THER switch.
Or you can take your volt meter and check continuity of the switches individually, with the wires off. There should be continuity on both of them, if not, one or both are bad.
Another thing, if you have a bad one you can get the same switch at the local heating and cooling shop. These switches are used as furnace fan control commonly. Just match temperature rating on them.