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Carrier · technician tips

Carrier service menus, test modes and resets

13 tips for air conditioner, furnace, heat pump: access codes, button combinations, test modes and the resets you need at the appliance.

Jump to: Service & test modes (7) · Reset & cancel (2) · Settings shortcuts (2) · Commissioning (2)

Service & test modes

Forced fan, low and high fire, test and diagnostic modes, error history and live data.

Recall the active status code on the outdoor board (25VNA8/24VNA9)

Air conditioner · Carrier Infinity 19VS 24VNA9

Replays the most recent, highest-priority active status code on the amber STATUS LED; codes are kept without power. The unit does not heat or cool while the forced defrost pins are shorted.

  1. Turn the unit power OFF
  2. Short the FORCED DEFROST connector (J2 on the board) with a clip wire
  3. Turn power ON; the amber LED flashes the stored code (short flashes = first digit, long flashes = second digit)
  4. Power down and remove the short

Applies to: Carrier Infinity 25VNA8/24VNA9

Source: Carrier 25VNA8/24VNA9 service manual, Status Codes - Status Code Recall Mode, p.14. Written in our own words; check the manual for your exact model.

Read the last 7 faults (3-digit display furnaces)

Furnace · 59SC6A, Payne PG96VTA, 59MN7C

The FLt menu stores the 7 most recent faults in major.minor form; non means none stored.

  1. Scroll the main menu to FLt with MENU/SELECT
  2. Press NEXT/OPTION to step through the stored faults
  3. Decode the codes with the furnace service label

Applies to: 59SC6A, Payne PG96VTA and 59MN7C furnaces (3-digit display control)

Source: Carrier 59SC6A installation instructions, Table 21 Main Menu Options, p.53; Payne PG96VTAB installation instructions, Main Menu Options table, p.53; Carrier 59MN7C installation instructions, Table 18 Main Menu Options, p.47. Written in our own words; check the manual for your exact model.

Recall stored status codes (amber LED furnaces)

Furnace · 59TP6A, 58SB0A/58SB1A

Replays the stored status codes on the amber LED; codes survive power loss. Two-digit codes are short flashes (first digit) then long flashes (second digit).

  1. 59TP6A: no thermostat signal, blower-off delays finished, 115 V on, blower door removed
  2. 59TP6A: turn SW1-1 ON and hold the blower door switch closed; up to 7 codes flash, the 8th is always 11 (nothing stored)
  3. 59TP6A: turn SW1-1 OFF, refit the door; steady amber LED = normal
  4. 58SB0A/58SB1A: with no call and delays finished, note the LED state through the sight glass
  5. 58SB0A/58SB1A: briefly pull the wire off the draft safeguard (DSS) switch until the LED goes out, then reconnect; the stored code flashes 4 times (11 = none)
  6. 58SB0A/58SB1A: do not leave the LS or DSS wire off longer than 4 seconds or the blower starts and the stored code is replaced by 33

Applies to: 59TP6A and 58SB0A/58SB1A furnaces (amber status LED control)

Source: Carrier 59TP6A installation instructions, Troubleshooting / Service and Maintenance, p.76-77; Carrier 58SB0A/58SB1A installation instructions (58SB0A-05SI), p.26 and p.31. Written in our own words; check the manual for your exact model.

Run the component test from the menu (3-digit display furnaces)

Furnace · 59SC6A, Payne PG96VTA, 59MN7C

Starts the self-test from the Ct menu item; only starts from idle (iDl) with no W, Y or G demand.

  1. Disconnect the thermostat wire at the R terminal so no demand is present
  2. Hold the blower door switch in with one hand to power the board (do not tape it down)
  3. Scroll the main menu to Ct and press MENU/SELECT; the sequence runs by itself (tSt, PUr, HSi, Fn, End)
  4. Reconnect R and refit the blower door
  5. Err on the display means the test could not start: clear thermostat inputs or faults and make sure status is iDl

Applies to: 59SC6A, Payne PG96VTA and 59MN7C furnaces (3-digit display control)

Source: Carrier 59SC6A installation instructions, Table 21 Main Menu Options, p.53; Payne PG96VTAB installation instructions, Main Menu Options table, p.53; Carrier 59MN7C installation instructions, Table 18 Main Menu Options, p.47. Written in our own words; check the manual for your exact model.

Run the furnace component self-test (amber LED furnaces)

Furnace · 59TP6A, 58SB0A/58SB1A

Runs inducer, igniter and blower in sequence with no call for heat so each part can be checked. Only starts with no thermostat signal; the gas valve never opens.

  1. 59TP6A: remove blower door and the R wire; turn SW1-6 ON and hold the door switch closed
  2. 59TP6A sequence: inducer high-heat speed; after 10 s igniter on 15 s; blower mid-range 15 s; inducer low-heat speed 10 s, then stops
  3. 59TP6A: turn SW1-6 OFF, refit R wire and door; status code 11 or 25 flashes afterwards; to repeat turn SW1-6 OFF then ON
  4. 58SB0A/58SB1A: disconnect R lead, hold door switch closed, jumper COM-24V to the TEST/TWIN quick-connect until the LED goes out (about 2 s)
  5. 58SB0A/58SB1A sequence: LED repeats previous code 4 times; inducer runs to the end; igniter 15 s; blower HEAT speed 10 s then COOL speed 10 s; inducer stops
  6. 58SB0A/58SB1A: reconnect R lead, release the switch, refit the door

Applies to: 59TP6A and 58SB0A/58SB1A furnaces (amber status LED control)

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. Written in our own words; check the manual for your exact model.

Force a defrost cycle by shorting the defrost pins

Heat pump · Carrier single-stage communicating HP

Starts a defrost by hand. A full defrost only runs with coil at 32 F / 0 C or colder and outdoor air under 50 F / 10 C; otherwise only an abbreviated 30-second defrost. On HK32EA003/008 boards, with the defrost thermostat open you get about 30 s, closed a full cycle.

  1. Short the two-pin FORCED DEFROST header for 5 seconds, then release
  2. On HK32EA003/008 boards, short the speed-up pins (J1) with a screwdriver for 5 seconds and release
  3. On the Infinity single-stage communicating heat pump the same can be commanded from the user interface

Applies to: Carrier single-stage communicating heat pump; HK32EA003/008 defrost boards

Source: Carrier residential A/C and heat pump service manual 24-25, Forced Defrost, p.48; HK32EA003/008 Defrost Control, p.17-18. Written in our own words; check the manual for your exact model.

Recall the active status code on the outdoor board (25VNA8/24VNA9)

Heat pump · Carrier Infinity 18VS 25VNA8

Replays the most recent, highest-priority active status code on the amber STATUS LED; codes are kept without power. The unit does not heat or cool while the forced defrost pins are shorted.

  1. Turn the unit power OFF
  2. Short the FORCED DEFROST connector (J2 on the board) with a clip wire
  3. Turn power ON; the amber LED flashes the stored code (short flashes = first digit, long flashes = second digit)
  4. Power down and remove the short

Applies to: Carrier Infinity 25VNA8/24VNA9

Source: Carrier 25VNA8/24VNA9 service manual, Status Codes - Status Code Recall Mode, p.14. Written in our own words; check the manual for your exact model.

Reset & cancel

Clearing lockouts, service reminders and fault history; skipping purge or de-air programs.

Clear the stored fault history (3-digit display furnaces)

Furnace · 59SC6A, Payne PG96VTA, 59MN7C

Wipes the fault history from the FLt menu.

  1. Scroll the main menu to FLt with MENU/SELECT
  2. Scroll to Clr
  3. Press MENU/SELECT

Applies to: 59SC6A, Payne PG96VTA and 59MN7C furnaces (3-digit display control)

Source: Carrier 59SC6A installation instructions, Table 21 Main Menu Options, p.53; Payne PG96VTAB installation instructions, Main Menu Options table, p.53; Carrier 59MN7C installation instructions, Table 18 Main Menu Options, p.47. Written in our own words; check the manual for your exact model.

Reset all settings to factory defaults (3-digit display furnaces)

Furnace · 59SC6A, Payne PG96VTA, 59MN7C

The rSt menu item resets all installer settings to factory defaults when YEs is selected.

  1. Scroll the main menu to rSt with MENU/SELECT
  2. Press NEXT/OPTION and step to YEs
  3. Press MENU/SELECT to save; the display flashes three times

Applies to: 59SC6A, Payne PG96VTA and 59MN7C furnaces (3-digit display control)

Source: Carrier 59SC6A installation instructions, Table 21 Main Menu Options, p.53; Payne PG96VTAB installation instructions, Main Menu Options table, p.53; Carrier 59MN7C installation instructions, Table 18 Main Menu Options, p.47. Written in our own words; check the manual for your exact model.

Settings shortcuts

Where the useful parameters live and what they are set to from the factory.

Change a value in the 3-digit display menu

Furnace · 59SC6A, Payne PG96VTA, 59MN7C

Same method for every menu item (for example HoD, Cod, dir, tnn): scroll, step the value, save.

  1. Press MENU/SELECT to scroll the main menu to the item
  2. Press NEXT/OPTION to show the current value (it flashes) and step through the choices
  3. Press MENU/SELECT to save; the display flashes three times to confirm

Applies to: 59SC6A, Payne PG96VTA and 59MN7C furnaces (3-digit display control)

Source: Carrier 59SC6A installation instructions, Table 21 Main Menu Options, p.53; Payne PG96VTAB installation instructions, Main Menu Options table, p.53; Carrier 59MN7C installation instructions, Table 18 Main Menu Options, p.47. Written in our own words; check the manual for your exact model.

Show supply and return air temperature on the display (59MN7C)

Furnace · 59MN7C

The t° menu item turns on a rotating display of mode, supply air temperature (SAT), return air temperature (RAT) and the difference. Default is off; it only shows while heating, cooling or heat pump operation is running.

  1. Scroll to t° in the main menu
  2. Choose F or C (or off)
  3. If the displayed SAT does not agree with a thermometer, move the SAT sensor further from the furnace or past a bend in the duct

Applies to: 59MN7C modulating furnace

Source: Carrier 59MN7C installation instructions, Temperature Display, Table 18, p.47. Written in our own words; check the manual for your exact model.

Commissioning

Start-up and set-up steps that are easy to miss.

Refrigerant charging mode on Infinity control (25VNA8/24VNA9)

Air conditioner · Carrier Infinity 19VS 24VNA9

Opened from the Installation and Service screen to check or set charge. Offers weigh-in or heating check methods; the heating check runs at stage 5 with matched fans and counts down while stabilizing. Service-valve subcooling shows only when temperatures are in range.

  1. On the Infinity control open Installation and Service, then Refrigerant Charging
  2. Pick the charge method on the Charging Mode Selection screen
  3. Wait for the stabilization countdown before reading pressures

Applies to: Carrier Infinity 25VNA8/24VNA9 communicating systems

Source: Carrier 25VNA8/24VNA9 service manual, Check Charge and Heating Check Chart Procedure, p.9-12. Written in our own words; check the manual for your exact model.

Refrigerant charging mode on Infinity control (25VNA8/24VNA9)

Heat pump · Carrier Infinity 18VS 25VNA8

Opened from the Installation and Service screen to check or set charge. Offers weigh-in or heating check methods; the heating check runs at stage 5 with matched fans and counts down while stabilizing. Service-valve subcooling shows only when temperatures are in range.

  1. On the Infinity control open Installation and Service, then Refrigerant Charging
  2. Pick the charge method on the Charging Mode Selection screen
  3. Wait for the stabilization countdown before reading pressures

Applies to: Carrier Infinity 25VNA8/24VNA9 communicating systems

Source: Carrier 25VNA8/24VNA9 service manual, Check Charge and Heating Check Chart Procedure, p.9-12. Written in our own words; check the manual for your exact model.

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Carrier error codes

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For licensed technicians. Installer menus, test modes and access codes change settings that affect safety; only use them if you are trained on the appliance and understand the result. Gas, electrical and refrigerant work must be done by a qualified, licensed person, and the manufacturer’s manual for the exact model and local codes always take priority. HVACopedia is not affiliated with any manufacturer; brand and model names only identify the equipment.