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Rinnai · Air handler troubleshooting

Circulator pump does not run

What is going on

The external pump on the hydronic loop does not start on a call for heat.

Likely causes

  • No 120 V power at the pump
  • Pump seized from hard water

Check in this order

  1. Check that 120 V power is reaching the pump.
  2. Hard water can seize the pump. Keep the recirculation setting active (Pump menu) so the pump runs periodically and does not seize.

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.