Reset & cancel: Furnace tips

Short, practical technician tips on reset & cancel for furnace. Check each one against the manual for your exact model before acting.

Turning off gas to the unit

Allied · Service shut-down

Use this procedure before any service.

1. Set the thermostat to the lowest setting.
2. Turn off all electrical power to the unit if service will be performed.
3. Remove the upper access panel.
4. Move the gas valve switch to OFF.
5. Replace the upper access panel.

Watchguard automatic reset after ignition lockout

Allied · Integrated control ignition lockout

The integrated control has an internal Watchguard. After one hour of continuous heat demand it resets an ignition-failure lockout, usually caused by low gas line pressure.

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

Carrier · 59SC6A, Payne PG96VTA and 59MN7C furnaces (3-digit display control)

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

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

Carrier · 59SC6A, Payne PG96VTA and 59MN7C furnaces (3-digit display control)

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

Reset the furnace control to factory defaults (rFd)

Daikin · Daikin DR96TN/DD96TN two-stage furnaces

The rFd menu item returns the control menu settings to factory defaults.

1. Press the left or right switch until rFd shows
2. Press the center switch, pick yes or no with the left or right switch
3. Press the center switch to confirm

View and clear the stored faults (L6F / F10)

Daikin · Daikin DR96TN/DD96TN two-stage furnaces

The stored fault list is labelled L6F in the troubleshooting chart and F10 (last 10 faults) in the menu table; the center switch steps through it and clears it.

1. Press the left or right switch until L6F shows
2. Press the center switch and read the stored faults
3. To erase them, keep the center switch pressed for 5 to 30 seconds; the display blinks three dashes three times, then shows L6F again

Clear an E0 lockout (3 ways)

Goodman · GMVC95/AMVC95 upflow and *CVC9 counterflow two-stage furnaces

Lockout after 3 failed ignition tries clears in any of these ways.

1. Wait: the control resets itself after 1 hour.
2. Cut 115 V power to the furnace and restore it.
3. Turn the thermostat down so there is no heat call for 1-20 seconds, then set it back.
4. If the fault is still there, it goes straight back into lockout.

Clearing the fault history

Goodman · All 34.5in chassis furnaces

In the Last 6 Faults menu, press and hold Center for 5 seconds. This clears all non-active faults in that menu. The display flashes three times to confirm. Clear the history during maintenance or service.

1. Enter the Last 6 Faults (L6F) menu.
2. Press and hold Center for 5 seconds.
3. Watch for three flashes to confirm the faults were cleared.

Reset the ComfortNet network (learn button)

Goodman · GMVC95/AMVC95 upflow and *CVC9 counterflow two-stage furnaces

The learn button on the furnace control resets communication.

1. Press once quickly = power-up reset.
2. Hold about 2 seconds = out-of-box reset.
3. The red LED shows 2 flashes while it resets.

Reset the furnace control to factory defaults (rFd)

Goodman · GM9S96/AM9S96, GM9S80/AM9S80 and GM9C96/AM9C96 furnaces (7-segment control)

The rFd menu item returns the control menu settings to factory defaults.

1. Press the left or right switch until rFd shows
2. Press the center switch, pick yes or no with the left or right switch
3. Press the center switch to confirm

Resetting a furnace lockout

Goodman · All 34.5in chassis gas furnaces

Lockout happens when the furnace fails to ignite after three attempts in one call for heat. The furnace stops and shows a lockout code on the 7-segment display. The control resets automatically one hour after lockout. A manual reset is also possible.

1. Wait one hour for the automatic reset, or
2. Interrupt 115 VAC power to the furnace to reset manually, or
3. Lower the thermostat so there is no call for heat for 1 to 20 seconds to reset manually.

View and clear the last 6 stored faults (L6F)

Goodman · GM9S96/AM9S96, GM9S80/AM9S80 and GM9C96/AM9C96 furnaces (7-segment control)

The L6F menu item lists the last 6 fault codes, newest first. Read the stored code through the sight glass before opening the blower door, since opening it without holding the door switch closed erases the stored code.

1. Press the left or right switch until L6F shows
2. Press the center switch and read the stored faults
3. To erase them, keep the center switch pressed for 5 to 30 seconds; the display blinks three dashes three times, then shows L6F again

Reset an ignition lockout (9MAE)

ICP · (F/G)9MAE0601714A, 0602120A, 0801714A, 0802120A, 1002122A, 1202422A

Ignition lockout auto-resets after 3 hours; to reset sooner, briefly cut power.

1. Briefly cut 115 V to the furnace, or cut 24 V at SEC1/SEC2 (not at the thermostat terminals)

Clear stored error codes in the error recall menu

Lennox · Lennox EL296UHV, SL280UHV/SL280UHNV, SL297UHNV and ML180UHEK furnaces with 7-segment integrated control

The lowercase c in the error recall menu erases all stored codes; it must be confirmed while it flashes.

1. Enter error recall by holding the button until E shows, then release.
2. Scroll the recall menu until c shows (it changes about every 5 seconds).
3. Press the button again while c is still flashing to delete all stored codes.
4. Exit by holding the button until three bars show.

Clear an ignition lockout (E7) early

Midea · BGH96M060B3A, BGH96M080B3A, BGH96M080C4A, BGH96M100C5A, BGH96M100D5A, BGH96M120D5A

After two failed ignition attempts the control locks out with E7.

1. Remove 115 V power or the thermostat call for 1-20 s.

Clear a lockout

Rheem · 96V and 96MDV series 2-stage communicating IFC

Resets the control after a lockout.

1. Shut off main power to the unit.
2. Wait 30 seconds, then restore power.
3. Or remove the heat call and re-establish it.

Clear fault history by communication command

Rheem · 96V and 96MDV communicating furnaces

The fault history can also be cleared over the communication link, without using the pushbutton.

1. Send the HW1SHOTS write command with the Clear Alarm History Command field set.
2. Confirm the display flashes segments A and D as the pushbutton clear does.

Clear fault history with dipswitch S3-18

Rheem · 96V and 96MDV furnaces, legacy mode

Turning S3-18 off, on, off, on, off, on (or the reverse pattern) within less than 30 seconds clears the fault history buffer.

1. Toggle S3-18 off/on/off/on/off/on, or on/off/on/off/on/off, three times within less than 30 seconds

Clear fault history with the pushbutton

Rheem · 96V and 96MDV communicating furnaces

The fault buffer can be cleared from the furnace control pushbutton while the Fault History Display menu is active.

1. Open the Fault History Display (FL) menu.
2. Hold the pushbutton for 5 seconds or more.
3. Watch for segments A and D on the right-most displays to flash on and off for one second each, three times, which confirms the buffer is clear.

Clear the fault history

Rheem · (-)96VA040-115 (R96V / U96V) and (-)(-)96MDV040-115 two-stage variable-speed communicating furnaces

Two ways to wipe the six-fault buffer.

1. With FL showing in the pushbutton menu, hold the button 5 seconds or more; the right display flashes its top and bottom bars three times.
2. Or flip dipswitch S3-18 off/on three times (or on/off three times) within 30 seconds, then put it back to its original position.
3. Faults older than 168 powered hours drop out by themselves.

Clearing lockouts

Rheem · (-)96VA040-115 (R96V / U96V) and (-)(-)96MDV040-115 two-stage variable-speed communicating furnaces

Soft lockouts (five-minute pressure switch, one-hour ignition/flame) and hard lockouts clear differently.

1. Any lockout clears when the cause is fixed and power is cycled off and on.
2. Soft lockout only: remove the heat call for more than 2 but less than 20 seconds.
3. Hard lockout from a dead blower (61 four times in one call) clears if you cycle the heat call; a 93 hard lockout does not.
4. During lockout, cooling and continuous fan still run but the display shows the lockout code instead of C or F.

Replay or clear the fault history on power-up (802P / 80MDP / R95P)

Rheem · Rheem/Ruud (-)802P / 80MDP 80% two-stage furnaces; R95P furnaces

After a power cycle the seven-segment display replays the three most recent faults under one week old, newest first. An old code does not mean the fault is active now.

1. Switch furnace power off and back on
2. Watch the display: up to three stored faults flash, newest first
3. To wipe the history, flip the fault-clear DIP switch (SW8 on the 802P control, SW4 on R95P) six times in a row, alternating, within 30 seconds, then put it back where it was

Replay or clear the last five faults (RGPE/RGLE)

Rheem · Rheem/Ruud RGPE / RGLE modulating furnaces

On a power reset the dual display plays back the last five faults, newest first. Codes 82, 11, 45, 46 and 57 are not stored twice in a row.

1. Cycle power to the furnace control
2. Watch the display: the last five faults appear, newest first
3. To clear, flip DIP switch SW3-2 four times in a row, alternating, within 30 seconds, then return it to its original position; or use CLEAR FAULTS in the thermostat menu

Reset a soft lockout (R95P)

Rheem · R95PA040, 060, 070 (1317MSA), R95PA085, 100 (1521MSA), R95PA115 (1524MSA); (-)95P series

Soft lockouts can be cleared by cycling the heat call or power. A 1-hour lockout also resets on its own after one hour; a hard lockout (code 93) needs a power reset; code 61 hard lockout can be reset by cycling the heat call.

1. Cycle the heat call off for 2 to 20 seconds, or cycle power
2. Code 93 hard lockout: cycle power

Reset the overtemperature safety switch

Rheem · All 96V and 96MDV series furnaces

The overtemperature switches sit in the burner compartment and trip when combustion air is inadequate. A tripped switch must be reset by hand, but only after the cause is cleared.

1. Find the cause of the overtemperature trip, usually inadequate combustion air.
2. Correct the cause.
3. Press the manual reset on the switch in the burner compartment.

Burner box temperature limit reset

Trane · All models

A manual reset temperature limit is on the burner box and opens the gas circuit on overheat.

1. If the limit trips, find and correct the overheat cause.
2. Reset the manual limit on the burner box.
3. For full shutdown, set the main gas valve switch to OFF and disconnect electrical supply.

Burner box temperature limit shutdown

Trane · AUH1B furnaces

The manual reset limit on the burner box opens and shuts off gas flow when temperature is excessive.

1. Check vent and combustion air inlet terminations for blockage.
2. Clear any blockage, then press the reset button.
3. If there is no blockage, have a qualified servicer reset the limit.

Reset after lockout

Trane · AUH1B furnaces

The control stays locked out until it is reset manually.

1. Turn system power off, on, off, then on again within 30 seconds.
2. Reset can be done at the unit power source or at the thermostat.
3. If the sequence is not completed within 30 seconds, it will not reset.

Reset the control to factory defaults

Trane · S8V2, S8B1, S8X1, S8X2

Holding Menu and Option together at idle resets all menu values to factory defaults; the display flashes FD three times to confirm.

1. Make sure the display is in idle (IdL)
2. Hold Menu and Option together for 15 seconds, then release
3. FD flashes three times