HVACopediaRinnai · Air handler troubleshooting
Pump noisy at start-up
What is going on
The pump makes noise when it starts.
Likely causes
- Air in the hot water loop
Check in this order
- Purge the air from the hot water loop.
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.