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Rinnai · Air handler troubleshooting

Heat comes out in fan-only mode

What is going on

Warm air is delivered when only the fan is on and there is no call for heat.

Likely causes

  • Check valve in the heating circuit missing or stuck open

Check in this order

  1. Make sure the check valve in the heating circuit is installed and is not stuck open.

Applies to: Rinnai Canadian hydronic air handler (CAH050E) with a Rinnai water heater/boiler

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Source: Rinnai Canadian Air Handler Installation and Operation Manual (600000023), Troubleshooting, p.40. Written in our own words; check the manual for your exact 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.