HVACopediaCarrier · Furnace
15 Blower motor lockout
What the control is telling you
The blower failed to reach 250 RPM, or did not communicate within 30 seconds after being turned on, in two heating cycles in a row. Auto-resets after 3 hours. This code comes from the troubleshooting guide; it is not printed on the blower-door service label.
Applies to: 59TP6A two-stage variable-speed ECM multipoise condensing gas furnace, all sizes (040-10 to 120-22)
Likely causes
- Blower motor (ECM) fault
- Blower motor wiring or communication problem
- Blower wheel obstruction
Test and repair steps
- Warning: Shut off 115-V power and gas, and lock/tag out before working inside the furnace; there may be more than one power source.
- Check the blower motor power and communication harness connections at the motor and control.
- Spin the blower wheel by hand; check for binding, debris or a loose wheel.
- Reset power and run the Component Self-Test (R wire off, SW1-6 ON, door switch closed); the blower should run at mid-range airflow for 15 seconds.
- Replace the faulty motor or harness, then confirm normal heat cycles.
Settings for these units
Filter sizes by casing width and filter cabinet · 59TP6A
| Location | Size | Side return filter | Bottom return filter | Type |
|---|---|---|---|---|
| Furnace casing | 14-3/16 in. wide | 16 x 25 x 3/4 in. | 14 x 25 x 3/4 in. | Washable |
| Furnace casing | 17-1/2 in. wide | 16 x 25 x 3/4 in. | 16 x 25 x 3/4 in. | Washable |
| Furnace casing | 21 in. wide | 16 x 25 x 3/4 in. | 20 x 25 x 3/4 in. | Washable |
| Furnace casing | 24-1/2 in. wide | 16 x 25 x 3/4 in. | 24 x 25 x 3/4 in. | Washable |
| Filter cabinet | 16 in. high | (1) 16 x 25 x 3/4 in. or (1) 16 x 25 x 4-5/16 in. | - | Washable or media |
| Filter cabinet | 20 in. high | (1) 20 x 25 x 3/4 in. or (1) 20 x 25 x 4-5/16 in. | - | Washable or media |
| Filter cabinet | 24 in. high | (1) 24 x 25 x 3/4 in. or (1) 24 x 25 x 4-5/16 in. | - | Washable or media |
No internal filter rack in this furnace - an external filter is required.
Side-return filters can differ in size - measure the existing filter.
Minimum clearances to combustibles · 59TP6A
| Position | Clearance |
|---|---|
| Rear | 0 in. (0 mm) |
| Front (combustion air openings) | 1 in. (25 mm) |
| Front, required for service | 24 in. (610 mm) - check local code |
| All sides of supply plenum | 1 in. (25 mm) - check local code |
| Sides | 0 in. (0 mm) |
| Vent | 0 in. (0 mm) |
| Top of furnace | 1 in. (25 mm) |
Keep 1 in. from combustibles to supply duct for 36 in. horizontally from the furnace.
Do not set on carpet or combustible tile; downflow on combustible floor needs the accessory floor base unless on a matching coil casing.
Models that show this code
8 models in 59TP6A
Other codes on the same units
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Source: Carrier 59TP6A Installation, Start-up, Operating and Service Instructions, Fig. 66 Troubleshooting Guide (cont.), p.89; Component Self-Test, p.77. 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.