Guardian Furnace Error Codes

Using Guardian furnace, you may experience some issues with its work and need urgent help with it. To alleviate your concerns and give you some help, there are tables on the page containing Guardian furnace error codes.

This data is useful in case of any unexpected things happening to your furnace. For each error code and each of flash types there is a detailed description of possible breakdown which may happen. For all codes, like Guardian furnace error code 4, you have additional messages which may appear on the screen, and an explanation or a recommendation what to do next to solve the problem.

Guardian RGF29-E Furnace Error Codes

CODESDESCRIPTION
SLOW GREEN FLASHNormal operation
SLOW AMBER FLASHNormal operation with call for heat
RAPID RED FLASHTwinning error, incorrect 24V phasing. Check twinning wiring. Flame sense current is below 1.5 microamps
RAPID AMBER FLASHCheck and clean flame sensor. Check for proper gas flow. Verify that current is greater than 1.5 microamps at flame current test pad.
4 AMBER FLASHESThe control is receiving a ”Y" signal from the thermostat without a ”G" signal, indicating improper thermostat wirinq.
1 RED FLASHThis indicates that flame was sensed when there was not a call for heat. The control will turn on both the inducer motor and supply air blower. A gas valve that leaks or is slow closing would typically cause this fault.
2 RED FLASHESThis indicates that the normally open pressure switch contacts are stuck in the closed position. The control confirms these contacts are open at the beginning of each heat cycle. This would indicate a faulty pressure switch or miswiring. This indicates the normally open pressure switch contact did not close after the inducer was enerqized.
3 RED FLASHESThis could be caused by a number of problems: faulty inducer, blocked vent pipe broken pressure switch hose or faulty pressure switch.
4 RED FLASHESThis indicates that the main limit switch has opened its normally closed contacts. The control will operate the supply air blower and inducer. This condition may be caused by: dirty filter, improperly sized duct system, incorrect blower speed setting, incorrect firing rate or faulty blower motor. Also, this fault code could be caused by a blown fuse located on the control board.
5 RED FLASHESThis fault is indicated if the normally closed contacts in the rollout switch opens. The rollout control is manually reset. If it has opened, check for proper combustion air, proper inducer operation, and primary heat exchanger failure or burner problem. Be sure to reset the switch and cycle power (24 VAC) to the control after correcting the failure condition. Also, this fault code could be caused by a blown fuse located on the control board.
6 RED FLASHESThis indicates that after the unit was operating, the pressure switch opened 4 times during the call for heat. If the main blower is in a "Delay on" mode, it will complete it, and any subsequent delay off period. The furnace will lock out for one hour and then restart.
7 RED FLASHESThis fault code indicates that the flame could not be established. This no-light condition occurred 3 times (2 retries) during the call for heat before locking out. Low gas pressure, faulty gas valve, dirty or faulty flame sensor, faulty hot surface ignitor or burner problem may cause this. The furnace will lock out for one hour and then restart.
8 RED FLASHESThis fault is indicated if the flame is lost 5 times (4 recycles) during the heating cycle. This could be caused by low gas pressure, dirty or faulty flame sensor or faulty gas valve. The furnace will lock out for one hour and then restart.
9 RED FLASHESIndicates reversed line voltage polarity or grounding problem. Both heating and cooling operations will be affected, check polarity at furnace and branch. Check furnace grounding. Check that flame probe is not shorted to chassis.
10 RED FLASHESFlame sensed with no call for heat. Check gas valve and gas valve wiring This indicates that a primary or auxiliary limit switch has opened its normally-closed contacts and has remained open for more than five minutes.
11 RED FLASHESThis condition is usually caused by a failed blower motor or blower wheel. Cycle power (24 VAC) to the control to reset the hard lockout condition after correcting the failure condition.

Guardian RGF19-P Furnace Error Codes

Primary patternSecondary patternSystem condition
Slow blinkNoneStand-by mode
Fast blinkNoneCall for heat present
ON SolidNoneInternal control failure/ miswiring
1 blink1 blinkIgnition failure
2 blinks1 blinkFlammable vapors present
2 blinks3 blinksFlammable Vapor Detector failure/ miswiring
3 blinks1 blinkVacuum switch fails to open
3 blinks3 blinksVacuum switch fails to close
4 blinks1 blinksLine/ neutral polarity failure
4 blinks2 blinkECO failure
4 blinks3 blinksFalse flame
5 blinksNoneVacation mode active

Guardian RGF1L-E Furnace Error Codes

Temp Display MessageScrolled MessageStatus
Not DisplayedNot DisplayedPower Up
Not DisplayedNot DisplayedNormal/Standby
EEINTERNAL FAULTInternal Control Fault/No Power
EOLOCKOUTLockout Due to Excessive Retries
E1PS1 CLOSEDLow Stage Pressure Switch Stuck Closed at Start of Heating Cycle
E2PS1 OPENLow Stage Pressure Switch Stuck Open
E3HIGH LIMIT OPENOpen High Limit Switch
E4IMPROPER FLAMEFlame Detected When no Flame Should be Present
Not DisplayedNot DisplayedOpen Fuse
E6WEAK FLAMELow Flame Signal
E7IGNITER FAULTIgniter Fault or Improper Grounding
E8PS2 CLOSEDHigh Stage Pressure Switch Stuck Closed at Start of Heating Cycle
E9PS2 OPENHigh Stage Pressure Switch Stuck Open
EAREVERSED PLTYReversed 115VAC Polarity