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Rheem · Furnace troubleshooting

ECM blower does not start on heat

What is going on

RGPE/RGLE: blower should start on high heat speed 15-20 seconds after burners light.

Likely causes

  • Loose IFC-ECM connections
  • No 24 V to ECM control
  • PFC choke
  • No 115 VAC to motor
  • Dipswitch settings

Check in this order

  1. Check all connections between IFC and ECM motor.
  2. Check 24 V at the ECM 4-pin control connector, pins 1 and 4.
  3. Check dipswitch settings.
  4. Check the PFC choke and its wiring.
  5. Check 115 VAC line voltage to the motor.
  6. Read the fault code on the displays.

Applies to: Rheem/Ruud (-)GPE upflow/horizontal and (-)GLE downflow 2-stage 80+ communicating gas furnaces

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Source: Rheem RGPE/RGLE Installation Instructions 92-24161-77-02 (ManualsLib 1287511), Figure 45 Troubleshooting Chart, p.63 (PDF p.67). 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.