HVACopediaCarrier · Furnace
Component test Component self-test mode
What the display is showing
Service mode that runs the inducer, igniter and blower one after another with no call for heat, so each part can be checked on its own. It only starts when no thermostat signal is present at the control. The gas valve is never opened during the test.
Applies to: 59TP6A and 58SB0A/58SB1A furnaces (amber status LED control)
What to do
- 59TP6A Remove the blower door and the wire on the R terminal. Turn setup switch SW1-6 ON and manually hold the blower door switch closed.
- 59TP6A sequence inducer runs at high-heat speed; after 10 seconds the hot surface igniter is on for 15 seconds; the blower runs at mid-range airflow for 15 seconds; the inducer then drops to low-heat speed for 10 seconds and stops.
- 59TP6A Turn SW1-6 OFF, refit the R wire and the door. One or more status codes (11 or 25) flash afterwards. To repeat, turn SW1-6 OFF then ON.
- 58SB0A/58SB1A Disconnect the R lead, hold the blower door switch closed, and jumper COM-24V to the TEST/TWIN quick-connect terminal until the LED goes out (about 2 seconds).
- 58SB0A/58SB1A sequence the LED shows the previous status code 4 times; the inducer starts and runs until the end; the igniter is on for 15 seconds; the blower runs at HEAT speed for 10 seconds, then COOL speed for 10 seconds; the inducer stops. The gas valve and humidifier are not energized.
- 58SB0A/58SB1A Reconnect the R lead, release the door switch and refit the door.
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.
- Filter sizes by casing width · 58SB0A/58SB1A
Models that show this code
22 models in 59TP6A, 58SB0A/58SB1A
Other codes on the same units
- 33 Limit circuit fault
- 34 Ignition proving failure
- 43 Low-heat pressure switch open while high-heat switch closed
- 45 Control circuitry lockout
- LED OFF No amber LED - no power to control
- LED ON Amber LED steady on
- Rapid Flash Reversed 115-V polarity (or twinning phasing)
- Stored codes Recall stored status codes
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Source: Carrier 59TP6A installation instructions, Component Self-Test, p.77 and setup switch SW1-6 table; Carrier 58SB0A/58SB1A installation instructions, Start-Up Procedures step 3-4, p.26. Summarized in our own words; check the original manual for your 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.