Navien NPE-A / NPE-S Code E441
Hot water inlet thermistor 2: open or short circuit. Another temperature sensor reporting an open or short circuit, this one on the hot water inlet side. Navien numbers each sensor position separately, which is genuinely useful: the code tells a technician which sensor to go to before opening anything.
Part replacementThe verdict
Replace a part
Cheap sensor, ordinary service call, and the code has already done the diagnosis of which one.
Typical cost: $150–$450
US estimate for parts and labor. Prices vary by region and by who does the work — see how we estimate costs.
What the manual says
The meaning above is transcribed from the manufacturer's diagnostic documentation for the NPE-A / NPE-S — not averaged across the brand.
Source: Navien NPE Operation Manual (NPE-A / NPE-S) (p. 16), read Aug 2026 — the manufacturer's own documentation for this exact series.
What you can safely check
- Book a service call and quote the code number — it identifies the exact sensor.
Code E441 on other Navien series
The same code number can mean something different on another series — make sure you're reading the page for your exact unit:
Don't confuse this with
3 other Navien NPE-A / NPE-S codes point at a thermistor too. They are different components in different places, and ordering a part against the wrong one is the most common way this fault gets expensive: