HVAC Code Lookup

Bryant Furnace: 4 Flashes

A Bryant furnace LED pattern starting with 4 flashes matches 5 documented codes: 41, 45.1, 45.2, 45.3, 46.1. Watch the full pattern (short vs. long flashes) to tell them apart — all 5 are explained below.

Code 41: No blower RPM

WarningShown as: 4 short flashes, 1 long flash; minor codes 41.1 and 41.2

No blower RPM. 41.1 means no blower RPM at start-up; 41.2 means no blower RPM after the motor was already running.

Manual wording: “41.1 NO BLOWER RPM - No blower rpm at startup 41.2 NO BLOWER RPM - No blower rpm when blower motor is running.”

Documented for: 926TC

Likely causes, most common first

  1. Loose blower wire connections
  2. Failed blower motor

What you can safely check yourself

  • Make sure the blower access door is fully closed and latched
  • Turn the furnace off at the service switch for a minute and back on once

When to call a technician

An ECM blower motor and its wiring have to be tested by a technician.

A Bryant furnace throwing this code repeatedly has a reason — clearing the code without fixing the cause just hides it.

Source

Full page for Bryant code 41

Code 45.1: Control failure - flame circuit fault, memory mismatch, or sequence error on the control board

Soft lockoutShown as: 4 short flashes, 5 long flashes; 45.1 on the display

Control failure - flame circuit fault, memory mismatch, or sequence error on the control board.

Manual wording: “45.1 CONTROL FAILURE - flame circuit fault, memory mismatch or sequence error.”

Documented for: 926TC, 912SE

Likely causes, most common first

  1. Internal control board failure

What you can safely check yourself

  • Turn the furnace off at the service switch for a minute and back on once - the label says to cycle power

When to call a technician

Bryant's own instruction is that if code 45 repeats after cycling power, the control must be replaced.

A Bryant furnace throwing this code repeatedly has a reason — clearing the code without fixing the cause just hides it.

Sources

Full page for Bryant code 45.1

Code 45.2: Control failure - the gas valve relay will not close

Safety faultShown as: Major code 45 on the LED (4 short, 5 long); 45.2 on the display

Control failure - the gas valve relay will not close.

Manual wording: “45.2 CONTROL FAILURE - gas valve relay will not close.”

Documented for: 926TC, 912SE

Likely causes, most common first

  1. Failed gas valve relay on the control board

What you can safely check yourself

  • Turn the furnace off at the service switch and leave it off until a technician arrives

When to call a technician

A gas valve relay that will not close means the board cannot reliably shut off gas. Shut the furnace down and call a technician; the fix is a new control.

A Bryant furnace throwing this code repeatedly has a reason — clearing the code without fixing the cause just hides it.

Sources

Full page for Bryant code 45.2

Code 45.3: Control failure - EEPROM memory issue on the control board

Soft lockoutShown as: Major code 45 on the LED (4 short, 5 long); 45.3 on the display

Control failure - EEPROM memory issue on the control board.

Manual wording: “45.3 CONTROL FAILURE - EEPROM memory issue.”

Documented for: 926TC, 912SE

Likely causes, most common first

  1. Corrupted or failed memory on the control board

What you can safely check yourself

  • Turn the furnace off at the service switch for a minute and back on once

When to call a technician

If the code repeats after a power cycle, the control board has to be replaced by a technician.

A Bryant furnace throwing this code repeatedly has a reason — clearing the code without fixing the cause just hides it.

Sources

Full page for Bryant code 45.3

Code 46.1: Momentary loss of power

StatusShown as: 4 short flashes, 6 long flashes; 46.1 on the display

Momentary loss of power. Heating stops and restarts on its own once the power fluctuation is resolved.

Manual wording: “46.1 MOMENTARY LOSS of power - Heating operation will stop and will restart once the power fluctuation is resolved.”

Documented for: 926TC, 912SE

Likely causes, most common first

  1. Brownout or brief power interruption to the furnace

What you can safely check yourself

  • Nothing to fix if you had a power blip
  • If it repeats without outages, check that the breaker is fully on and the furnace switch is not loose

When to call a technician

Frequent 46.1 codes with no utility outages usually mean a loose 115 V connection or failing door switch - have a technician look.

A Bryant furnace throwing this code repeatedly has a reason — clearing the code without fixing the cause just hides it.

Sources

Full page for Bryant code 46.1

Other Bryant codes