Rinnai Boiler: Automatic de-aeration program (A xx, 17 min)
Automatic de-aeration program (A xx, 17 min) on a Rinnai boiler: After power-up or a reset the boiler runs a 17-minute air purge, shown as A followed by the countdown. Block 85 (no flow) also triggers it. The manual gives no key combination to skip it; wait it out or power-cycle and it restarts.
Applies to: E50CRN; E75CRN; E75CRP; E110CRN; E110CRP
How to fix automatic de-aeration program (a xx, 17 min): step by step
- Display A xx = purge in progress, counting down
- Burner is released as soon as flow is detected during the cycle
If the unit shows an error code, look it up: Rinnai Boiler codes
Source: Rinnai E-Combi Series Installation & Servicing Instructions (8U516009 V0116), p.50-54, 72. Written in our own words as a summary; always check the original manual.
General guidance for qualified technicians. The manufacturer's installation and service manual and local codes always take priority. Aurora Star Tech is not affiliated with, endorsed by or sponsored by any equipment manufacturer; brand and model names are used only to identify equipment and belong to their owners.