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Rheem · Furnace troubleshooting

Indoor blower does not start after burners light

What is going on

Burners light but the main blower does not start on heat speed about 20 s later.

Likely causes

  • No line voltage on HEAT terminal
  • Wiring from IFC to blower motor
  • Bad blower capacitor or motor
  • Pressure switch or limit opened during the trial

Check in this order

  1. Warning: Hazardous line voltage - disconnect power before servicing; work must be done by a trained, qualified service technician.
  2. Check line voltage between HEAT and NEUTRAL on the IFC.
  3. Check wires, connections and continuity between the IFC and the indoor blower motor.
  4. Check the blower capacitor, then the motor.
  5. If a pressure switch opened during the ignition trial, follow the 2-blink steps; if a limit opened, follow the 3-blink steps.

Applies to: Rheem (-)GRC/(-)GTC and 90RJ/90TJ 90 Plus condensing gas furnaces

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Source: Rheem (-)GRC/(-)GTC Installation Instructions 92-24161-88-00, Figure 56 IFC Troubleshooting Guide, p.54 (printed); Rheem 90RJ/90TJ Installation Instructions 92-24161-32-08, Figure 53, p.54. 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.