HVACopediaRinnai · Air handler troubleshooting
Insufficient or no heat
What is going on
The air handler runs but delivers little or no heat from the hydronic coil.
Likely causes
- Dirty air filter
- Clogged hydronic coil
- Air trapped in the heating loop
- Rinnai heater not running or water temperature too low
- Dirty inlet water filter on the Rinnai heater
- Restriction or partly closed valve in the heating loop
Check in this order
- Check the air filter and replace it if dirty.
- Make sure the hydronic coil is not clogged.
- Check for air in the heating loop and purge the loop if needed.
- Confirm the Rinnai heater is running and check the supply water temperature.
- Clean the inlet water filter on the Rinnai heater.
- Check the heating loop for restrictions and make sure all valves are fully open and working.
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.