Rinnai · Boiler

ERRO Error chapter

Menu / mode display E-Combi (E50CRNE75CRN/E75CRPE110CRN/E110CRP)

What the display is showing

Read-only: Err.L (last) to Err.5 (fifth previous) with code, status, T1, T2, kW and pump %.

Applies to: E50CRN; E75CRN; E75CRP; E110CRN; E110CRP

Other codes on the same units

Block 67 Supply/return sensor difference with burner off
Block 85 No water flow detected
COdE Access code entry
Copy Factory settings restored
FILL Water pressure low / system empty
FUSE 24 V fuse defective
Good Good state (normal)
Green button reset Restore factory parameters

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Source: Rinnai E-Combi Series Installation & Servicing Instructions (8U516009 V0116), p.58. Summarized in our own words; check the original manual for your model.

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.