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Tridicator Gauge Failure-Again?
Sorry if this has been covered. I did a search and couldn't find anything so I figured I'd ask:
When I repiped all my circulators and indirect last Spring I installed a tridicator guage on both the supply and return of my boiler. One gauge began fogging up immediately after install, the other about 2 weeks later. I figured oh well, bad batch/too tight/dropped or something so I pulled them and plugged the hole. Recently I finally changed the boiler and figured now was a good time to replace them. Different model but same result. One of the gauges failed immediately (fogged up and didn't register a temperature change) so now it must be me.
I DID NOT over-tighten them, 1/4 turn until they stopped leaking then 1/4 turn more.
I didn't use tape, only very little dope.
The end of the probe is EXACTLY where it should be, maybe even a little pulled back from the middle of the tee so I know its not bottoming out and damaging the probe.
What the heck am I doing wrong?