Noritz NR98 & NR111 Code 56
Multi-system CCP valve fault. Noritz restricts this one too: for NC380-SV-ASME and N-1321M-ASME only. The checks are an obstruction in the CCP valve and improper wiring of the multi-system connection. It belongs to commercial installations where several units are ganged together.
Also displayed as: F56
Part replacementThe verdict
Replace a part
A commercial multi-system code with two named causes, one mechanical and one electrical. Nothing here is a homeowner check, but neither is it an expensive part — the likely outcome is an obstruction or a wiring fault rather than a replacement.
Typical cost: $150–$800
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 NR98 & NR111 — not averaged across the brand.
Source: Noritz Service Manual — NR50 / NR66 / NR71 / NR98 / NCC199 / NRC111 / NR111 / NC380 (Rev. July 2011) (p. 56), read Sep 2026 — the manufacturer's own documentation for this exact series.
What you can safely check
- Confirm the model really is an NC380-SV-ASME or N-1321M-ASME.
- Note whether anything was recently changed in the multi-system wiring.
- Book a service call.
Don't confuse this with
3 other Noritz NR98 & NR111 codes point at a valve 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: