HVACopediaNoritz · Tankless water heater · Pump/purge
Auto Learning recirculation
What happens, in order
- Recirculation is on for the first 24 hours after setup
- A 14 day learning period starts
- Each time hot water is used longer than the learn threshold the unit remembers that time
- Next day the pump runs ahead of the remembered time to pre-heat the loop
- If a learned time sees no hot use for the erase interval, that time is dropped
- Mode is picked in Unit Settings of the EZ Start Plus app or the built-in display
Timings and thresholds
| Item | Value |
|---|---|
| Time to learn (default) | 10 s |
| Time to learn options | 3, 10, 60, 120 s |
| Learning period | 14 days |
| Erase learning flag (default) | 14 days |
| Erase learning flag options | 7 or 14 days |
| Pre-heat before scheduled time (default) | 15 min |
| Pre-heat options | off, 15, 30, 60 min |
Codes you may see during this
Applies to: Noritz NRCR92, NRCR111 (NRCR Pro)
Models
More Noritz tankless water heater sequences
- On-demand heating cycle · Domestic hot water
- Water route: main and bypass servo by set temperature · Domestic hot water
- Other recirculation modes · Pump/purge
- Freeze prevention heaters and pump · Freeze protection
Related
Take it to the job
Sequences of operation, error codes and tips work offline in the HVACopedia app.
Source: Noritz NRCR Pro Residential Condensing Recirculation training (NRCR Printable V3), recirculation modes section. Written in our own words; timings can differ by model and software version, so check the manual for your exact unit.
For licensed technicians. Gas, electrical and refrigerant work must be done by a qualified, licensed person. Shut off power and gas before servicing, never bypass a safety control, and follow the manufacturer’s manual for the exact model; it and local codes always take priority. HVACopedia is not affiliated with any manufacturer; brand and model names only identify the equipment.