Triangle tube after recall- Supply Sensor

wrxz24 · December 2025

Had the recall done end of October for ignition and yesterday had a lockout due to Supply Sensor stuck closed. I hit reset and it started and ran all night. Is the sensor serviceable or needs replaced? Wiring issue? TIA

I’ve had the boiler since 2012, it’s been pretty reliable part wise but now that the company ceased operations, not sure how long parts will be available. Should I start buying replacement parts now or save up for a new boiler?

Grallert · December 2025

These are good questions I don't have an opinion on. So I'm bumping this as I sure there is someone who does.

JMWHVAC · January 1

The supply sensor is one part that I have had to replace on several TT units. With that fault code, it may not appear for a while but sooner or later it will appear again. The other part I have been needing to replace is the water pressure sensor. Even tho it still reads correctly, I have seen quite a few dripping with the water coming thru the sensor. So, I'd advise those two items for on hand parts. The unfortunate thing with TT has been that the parts seem unreasonably expensive.

wrxz24 · January 1

https://forum.heatinghelp.com/discussion/comment/1880228#Comment_1880228

Good to know. Thanks.

JMWHVAC · January 1

I should have added that both parts are quite easy to replace.

wrxz24 · February 18

https://forum.heatinghelp.com/discussion/comment/1880248#Comment_1880248

thanks! Do you happen to know what igniter works with the new updated ignition recall?

GGross · February 18

https://forum.heatinghelp.com/discussion/comment/1888545#Comment_1888545

60-110 model PTRKIT413

175-250 model PTRKIT513

399 model PTRKIT613

pedmec · February 18

As someone posted on another thread. Try and buy the same boiler and strip it for parts. Obviously a bit tricky as you have to find one but they might be going for cheap money from a distributor who just wants to unload the stock.

hot_rod · February 19

the supply sensor is probably a basic thermistor. The manual gives you the resistance values so you can check it with an ohm meter

if the sensor did fail open , or a wiring glitch, a reset doesn't usually “fix” a bad sensor

Could be you have flow issues and the sensor was doing its job by tripping out on high temperature? Has the HX ever been deep cleaned ?

wrxz24 · February 19

https://forum.heatinghelp.com/discussion/comment/1888605#Comment_1888605

The tech that did the recall cleaned both the burner and Hx.

wrxz24 · February 19

https://forum.heatinghelp.com/discussion/comment/1888605#Comment_1888605

Yes reset does fix it so it maybe a flow issue but I’m piped primary secondary and I have high mass radiant mostly so am operating 99% of time on the low temp curve.

Triangle tube after recall- Supply Sensor

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