Rinnai Boiler: Heating system warms without a call
Heating system warms without a call on a Rinnai boiler: Radiators get hot without a demand.
Applies to: E50CRN; E75CRN; E75CRP; E110CRN; E110CRP
Common causes of heating system warms without a call
- Pump program key on (continuous circulation)
- Dirt or binding in the three-way valve or cartridge
How to fix heating system warms without a call: step by step
- Switch the pump program off.
- Clean or replace the three-way valve.
Safety: Gas, electrical and refrigerant work must be done by a licensed technician. Turn off power and gas before servicing, never bypass a safety control, and always follow the manufacturer's manual for your exact model.
If the unit shows an error code, look it up: Rinnai Boiler codes
Models
I-Series Plus 150K and smaller
I-Series Plus 175K and higher
Source: Rinnai E-Combi Series Installation & Servicing Instructions (8U516009 V0116), p.77 (15.4). 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.