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Quick question: what is the TFP store?

Will do!

Replaced the sensor this morning…heater is working again. Thanks everyone!

Thanks so much! This was interesting: when I put the SFS back together and tried the heater once more just to see, the same thing happened but I got an E05 error code for the first time. Every other time I just had the red light underneath the panel.

Hahaha…oops! Thank you

We always have the number “1”

Like this? I’m not getting any change of number on the multimeter

I don't have a multimeter, but I could ask around some friends

Thank you for your reply - super helpful!! and it sounds like I will start here, esp. since it's a pretty cheap part to replace :)

It starts out at air temp, then goes up to 100s, 200s, 300s, then 400s and then off. It doesn't bounce around too much really, and only takes about 30 seconds to turn off because of high 400s

Thank you so much for the information. I ran the heater without the thermal regulator in place, and it went up to 480 degrees super quickly, so it looks like my next step is to replace the stack flue sensor and then try again!

Thank you

Question: is it safe to do this? I'm just not smart enough about this system :) Also: can you run the heater for like a few days without the thermal regulator in place? Or maybe if the SFS is bad, it wouldn't work anyways?

- I think that is just a little water that was leaking from the cell - Filter pressure: I've back flowed and get no errors about high pressure, but unfortunately my little gauge broke so I don't know for certain :( - Pump speed is at 50 GPM when running heater

Hi James, Thanks so much for the replies! Here's some more info: - New thermal regulator opens under hot tap water from kitchen faucet (I honestly didn't measure 120 degrees, but it definitely opens...my old one was corroded and green) - Here's a picture inside regulator pipe:

Hi all! I'm wondering if anyone could help point me in the correct direction. Here's what I have so far: - 3 year old system has been working well until now (no signs of mice inside) - Heater ignites, and I get an SFS error about 15-45 seconds later bc it was quickly heating to over 400 degrees...