Philco
Philco Furnaces Error Codes
Complete list of fault codes and troubleshooting guides. Use the search below to find your specific error.
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1 FLASH
Furnace will not start; inducer motor does not run; LED status light flashes once repeatedly.
Ignition Failure Lockout
10 FLASH
Furnace does not respond to thermostat; LED status light flashes ten times repeatedly.
Communication Error or Internal Control Fault
2 FLASH
Furnace attempts to start but shuts down quickly; LED status light flashes twice repeatedly.
Pressure Switch Stuck Closed
3 FLASH
Furnace starts inducer but does not ignite; LED status light flashes three times repeatedly.
Pressure Switch Stuck Open
4 FLASH
Burners ignite but shut off quickly; LED status light flashes four times repeatedly.
Open High Limit Switch
5 FLASH
Furnace runs but cycles on and off frequently; LED status light flashes five times repeatedly.
Flame Sensed with Gas Valve Off (Flame Rollout or Stuck Gas Valve)
6 FLASH
Furnace starts but shuts down; LED status light flashes six times repeatedly.
Soft Lockout – Too Many Flame Failures
7 FLASH
Furnace does not start; LED status light flashes seven times repeatedly.
Low Flame Sense or Flame Proving Fault
8 FLASH
Furnace blower runs continuously; burners do not fire; LED status light flashes eight times repeatedly.
Secondary Limit or Rollout Switch Open
9 FLASH
Furnace will not start; LED status light flashes nine times repeatedly.
Reversed Line Polarity or Ground Fault
NO LED
No LED lights on control board; furnace completely dead.
No Power to Furnace
STEADY ON
LED status light is on solid with no flashes; furnace does not run.
Normal Power with No Call for Heat
Symptom
Furnace blower never turns on; burners run briefly then shut off on high limit.
Blower Motor Failure or Fan Relay Fault
Symptom
Furnace blower runs but burners do not light; cool air from vents.
No Ignition with Blower Operation
Symptom
Furnace cycles off on a windy day; sometimes fails to ignite.
Wind-Induced Venting Issues
Symptom
Furnace emits a rotten egg or sulfur smell.
Possible Gas Leak
Symptom
Furnace fan runs continuously even when thermostat is set to AUTO and no heat call is present.
Stuck Fan Relay or Fan Switch Setting
Symptom
Furnace ignites but flame is yellow and lazy instead of blue.
Improper Combustion
Symptom
Furnace inducer motor runs continuously even when there is no call for heat.
Stuck Relay or Pressure Switch Fault
Symptom
Furnace is very loud at the return grille; whistling or roaring sound.
Restricted Return Air or High Static Pressure
Symptom
Furnace makes loud banging or booming noise at startup.
Delayed Ignition
Symptom
Furnace occasionally trips the household circuit breaker.
Electrical Overload or Short Circuit
Symptom
Furnace produces a high-pitched squealing noise during operation.
Blower Motor or Blower Wheel Bearing Wear
Symptom
Furnace rattles or vibrates loudly when running.
Cabinet Vibration or Loose Components
Symptom
Furnace runs but does not produce enough heat; home never reaches set temperature.
Underfiring or Low Heat Output
Symptom
Furnace runs but some rooms are much colder than others.
Airflow Imbalance or Duct Issues
Symptom
Furnace short cycles, turning on and off frequently without reaching temperature.
Short Cycling
Symptom
Furnace shuts off and displays a carbon monoxide detector alarm in the home.
Potential Flue Gas Spillage or Heat Exchanger Crack
Symptom
Furnace starts and runs for a few minutes, then shuts off and restarts repeatedly.
Limit Cycling Due to Overheating
Symptom
Furnace starts but shuts down when blower starts; lights dim briefly.
Blower Motor Overload or Electrical Supply Issue
Symptom
Furnace will not start after a power outage.
Control Board Lockout or Power Surge Damage
Symptom
Rust-colored water or staining around furnace base.
Condensate Corrosion or Humidifier Leak
Symptom
Strong burning or electrical smell when furnace runs.
Overheating Components or Dust Burn-Off
Symptom
Thermostat shows heat call but furnace does nothing; no sounds from furnace.
Open 24V Control Circuit
Symptom
Water leaking around the base of the furnace.
Condensate Leak (High-Efficiency Models)
| Error Code | Symptom | Fault Type | Guide |
|---|---|---|---|
| 1 FLASH |
Furnace will not start; inducer motor does not run; LED status light flashes once repeatedly.
|
Ignition Failure Lockout | View Details |
| 10 FLASH |
Furnace does not respond to thermostat; LED status light flashes ten times repeatedly.
|
Communication Error or Internal Control Fault | View Details |
| 2 FLASH |
Furnace attempts to start but shuts down quickly; LED status light flashes twice repeatedly.
|
Pressure Switch Stuck Closed | View Details |
| 3 FLASH |
Furnace starts inducer but does not ignite; LED status light flashes three times repeatedly.
|
Pressure Switch Stuck Open | View Details |
| 4 FLASH |
Burners ignite but shut off quickly; LED status light flashes four times repeatedly.
|
Open High Limit Switch | View Details |
| 5 FLASH |
Furnace runs but cycles on and off frequently; LED status light flashes five times repeatedly.
|
Flame Sensed with Gas Valve Off (Flame Rollout or Stuck Gas Valve) | View Details |
| 6 FLASH |
Furnace starts but shuts down; LED status light flashes six times repeatedly.
|
Soft Lockout – Too Many Flame Failures | View Details |
| 7 FLASH |
Furnace does not start; LED status light flashes seven times repeatedly.
|
Low Flame Sense or Flame Proving Fault | View Details |
| 8 FLASH |
Furnace blower runs continuously; burners do not fire; LED status light flashes eight times repeatedly.
|
Secondary Limit or Rollout Switch Open | View Details |
| 9 FLASH |
Furnace will not start; LED status light flashes nine times repeatedly.
|
Reversed Line Polarity or Ground Fault | View Details |
| NO LED |
No LED lights on control board; furnace completely dead.
|
No Power to Furnace | View Details |
| STEADY ON |
LED status light is on solid with no flashes; furnace does not run.
|
Normal Power with No Call for Heat | View Details |
| – |
Furnace blower never turns on; burners run briefly then shut off on high limit.
|
Blower Motor Failure or Fan Relay Fault | View Details |
| – |
Furnace blower runs but burners do not light; cool air from vents.
|
No Ignition with Blower Operation | View Details |
| – |
Furnace cycles off on a windy day; sometimes fails to ignite.
|
Wind-Induced Venting Issues | View Details |
| – |
Furnace emits a rotten egg or sulfur smell.
|
Possible Gas Leak | View Details |
| – |
Furnace fan runs continuously even when thermostat is set to AUTO and no heat call is present.
|
Stuck Fan Relay or Fan Switch Setting | View Details |
| – |
Furnace ignites but flame is yellow and lazy instead of blue.
|
Improper Combustion | View Details |
| – |
Furnace inducer motor runs continuously even when there is no call for heat.
|
Stuck Relay or Pressure Switch Fault | View Details |
| – |
Furnace is very loud at the return grille; whistling or roaring sound.
|
Restricted Return Air or High Static Pressure | View Details |
| – |
Furnace makes loud banging or booming noise at startup.
|
Delayed Ignition | View Details |
| – |
Furnace occasionally trips the household circuit breaker.
|
Electrical Overload or Short Circuit | View Details |
| – |
Furnace produces a high-pitched squealing noise during operation.
|
Blower Motor or Blower Wheel Bearing Wear | View Details |
| – |
Furnace rattles or vibrates loudly when running.
|
Cabinet Vibration or Loose Components | View Details |
| – |
Furnace runs but does not produce enough heat; home never reaches set temperature.
|
Underfiring or Low Heat Output | View Details |
| – |
Furnace runs but some rooms are much colder than others.
|
Airflow Imbalance or Duct Issues | View Details |
| – |
Furnace short cycles, turning on and off frequently without reaching temperature.
|
Short Cycling | View Details |
| – |
Furnace shuts off and displays a carbon monoxide detector alarm in the home.
|
Potential Flue Gas Spillage or Heat Exchanger Crack | View Details |
| – |
Furnace starts and runs for a few minutes, then shuts off and restarts repeatedly.
|
Limit Cycling Due to Overheating | View Details |
| – |
Furnace starts but shuts down when blower starts; lights dim briefly.
|
Blower Motor Overload or Electrical Supply Issue | View Details |
| – |
Furnace will not start after a power outage.
|
Control Board Lockout or Power Surge Damage | View Details |
| – |
Rust-colored water or staining around furnace base.
|
Condensate Corrosion or Humidifier Leak | View Details |
| – |
Strong burning or electrical smell when furnace runs.
|
Overheating Components or Dust Burn-Off | View Details |
| – |
Thermostat shows heat call but furnace does nothing; no sounds from furnace.
|
Open 24V Control Circuit | View Details |
| – |
Water leaking around the base of the furnace.
|
Condensate Leak (High-Efficiency Models) | View Details |
No matching codes found
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