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so at this point it only runs with r and w bypassed?
And I did not see pic of the part replaced...is it a limit or a rollout?
May have some bad news..that is a porcelin roll out switch. It detects when heat rolls the wrong way backwards from the heat exchanger.
This is a "one and done" switch. If it trips more than once the odds are great that you have a bad or plugged heat exchanger (both are bad).
As far as running with r and w shorted together, this means the thermostat was compromised when it shorted to ground and you need a new thermostat......BUT.....I would have the exchanger checked before investing anymore money in the unit.
The roll out is the one switch we never want to see trip because it means main heat exchanger problem..
If it is plugged it is in the secondary heat exchanger...you can attempt to apply as much suction to the drain direct from furnace...using a shop vacuum.
Also you can tell by studying flames as they come on.....if you see them dance when the main blower kicks on or turn tips yellow it means a crack in exchanger. Even if plugged it is a heck of a job...I have had to remove the entire exchanger and flush and then reinstall...full days job..
no danger at all to run with r and w bypassed...it just will not shut down.
The danger is if you bypass the rollout switch.....then we get into potential fire and carbon monoxide issues.
R and W is simply taking the thermostat out of the loop....Just please do not bypass the roll out or main limit.
I apologize as it is much easier for me to give advice that saves money..But this is entering in to the dividing line of major repair or replacement.
I certainly wish you the best and feel free to stop back if further info is needed.
Just rate service to move off the active list.
yes...it is directly tied to the main heat transfer component. Basically this is the equivalent of a bad motor in a car...
I just went back and reviewed and you are correct.
As soon as the roll out was identified as being the culprit, everything should have ceased at that point.
I apologize, but then again I am old and have been working on these unit s along time...
Anything after finding an open rollout was likely putting off the inevitable...