HVACopedia

Rheem · Furnace

66 Blower overspeed (BLOWER OVRSPEED)

Medium severity RGPE/RGLE

What the control is telling you

ECM blower running faster than expected - usually means very low static (missing panel/filter) or very high restriction.

Applies to: RGPE/RGLE 2-stage 80+

Likely causes

  • Blower door or filter/panels missing
  • Duct disconnected
  • Severe restriction

Test and repair steps

  1. Confirm blower door and all panels are in place.
  2. Check filter and ducts for disconnection or blockage.
  3. Check blower wheel.
  4. Verify on unit check airflow (decimal blink = 1 per 100 CFM) against expected.

Settings for these units

Filter sizes as shipped, upflow (Table 19) · RGPE/RGLE

Cabinet widthInputBottom filterSide filterQuantity
17-1/2 in.50, 75 (000 Btu/h)15-3/4 x 25 in.15-3/4 x 25 in.1
21 in.75, 100 (000 Btu/h)19-1/4 x 25 in.15-3/4 x 25 in.1
24-1/2 in.125 (000 Btu/h)22-3/4 x 25 in.15-3/4 x 25 in.1

Use one filter location only - do not double-filter or filter the supply side.

21 in./100K: cut 3-1/2 in. off filter and frame for a side filter; 24-1/2 in./125K: cut 7 in.

Reduced clearance to combustibles (Fig. 3 and 4) · RGPE/RGLE

Model sizeCabinet width (A)Left sideRight sideBackTopFrontVent
RGPE upflow/horizontal 0517-1/2 in.0 in.3 in. (note 2)0 in.1 in.3 in.6 in. (note 3)
RGPE upflow/horizontal 07(A)17-1/2 in.0 in.3 in. (note 2)0 in.1 in.3 in.6 in. (note 3)
RGPE upflow/horizontal 07(B), 1021 in.0 in.00 in.1 in.3 in.6 in. (note 3)
RGPE upflow/horizontal 1224-1/2 in.0 in.00 in.1 in.3 in.6 in. (note 3)
RGLE downflow 07(A)17-1/2 in.0 in.3 in. (note 2)0 in.1 in.3 in.6 in. (note 3)
RGLE downflow 07(B), 1021 in.0 in.00 in.1 in.3 in.6 in. (note 3)
RGLE downflow 1224-1/2 in.0 in.00 in.1 in.3 in.6 in. (note 3)

Note 2: right side may be 0 in. with type B vent.

Note 3: vent clearance may be 1 in. with type B vent.

Models that show this code

10 models in RGPE/RGLE

RGLE-05(-)BMKRRGLE-07(-)AMKRRGLE-07(-)BRQRRGLE-10(-)BRMRRGLE-12(-)ARMRRGPE-05(-)BMKRRGPE-07(-)AMKRRGPE-07(-)BRQRRGPE-10(-)BRMRRGPE-12(-)ARMR

Other codes on the same units

  • 57 Pressure switch stuck open
  • 60 Blower fault - running (BLWR FLT-RUN)
  • 61 Blower fault - blower not running
  • 68 No blower communication (NO BLWR COMM)
  • 82 Supply air sensor fault (SA SENSOR FLT)
  • 93 Internal control fault
  • d1 No shared data (NO SHARED DATA)
  • d4 Memory card invalid (MEM CARD INVALD)

Save it for the next call

Star this code in the HVACopedia app and keep the whole library on your phone for jobs with no signal.

Open the app

Source: RGPE/RGLE: Table 16 p.49 / Table 20. 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.