Rheem · Furnace

68 No blower communication (NO BLWR COMM)

Critical severity RGPE/RGLE

What the control is telling you

IFC cannot communicate with the ECM blower motor. Thermostat also shows Call For Service / CHECK FURNACE to the homeowner.

Applies to: RGPE/RGLE 2-stage 80+

Likely causes

Loose/broken IFC-to-ECM communication wiring
No power to the motor
Failed ECM motor control

Test and repair steps

Check all connections between IFC and ECM motor.
Check 24 V at the ECM 4-pin connector, pins 1 and 4.
Check 115 VAC to the motor and the PFC choke.
Check memory card is correct (blower data, see d6/d7).
Replace the motor if wiring and power are good.

Settings for these units

Filter sizes as shipped, upflow (Table 19) · RGPE/RGLE
Reduced clearance to combustibles (Fig. 3 and 4) · RGPE/RGLE

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Source: RGPE/RGLE: Table 16 p.49 / Table 20; Fig. 45 p.63. Summarized in our own words; check the original manual for your model.

Homeowner looking at this code? See what it means for you and when to call a technician.

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.