10/13/2026
Replace water heater screen to read error code or replace entire water heater?
Navien 240 a2 tankless water heater installed 2021 by prior owners. We can only assume it has never been serviced. We do have a water softener if that makes a difference in scale.
Purchased the home 3 months ago with knowledge the screen was broken but never dealt with it.
3 days ago the screen started flashing red and we have zero hot water. It runs off propane. Tried unplugging and plugging it back in. No effect, still flashing red. Plumber came out and essentially told us we were missing a set of service lines so we’d be better off replacing the entire unit and getting the second set of lines. Said he could try to flush the system as is but that chemical and mineral mixture would go into the house and/or he could cut the existing lines but that might lead to a leak in the future and the unit itself might not be cleanable. Paraphrasing to best of my understanding.
1 day ago our stove no longer ignited. It also runs off propane. Idiot homeowners we are realized the propane tank is empty. Earliest fill date is tomorrow.
We’re going to see if it’s the propane that caused the water heater to flash red. Question is, do we spend ~$2k to fix the screen and service lines or the quoted $5800 to get a new Navien with proper service lines?