Keeprite
Keeprite Furnaces Error Codes
Complete list of fault codes and troubleshooting guides. Use the search below to find your specific error.
Advertisements
11
Furnace does not respond to thermostat; LED shows code 11 (no previous code / no fault stored) but no heat.
No Call for Heat or Control Board Not Receiving Signal
12
Furnace LED shows code 12 (blower on after power up) and blower may run briefly; furnace may not start heating immediately.
Normal Power-Up or Blower Delay Indication
13
Furnace locks out with LED code 13 (limit circuit lockout) after repeated limit trips; blower may run continuously.
Repeated High Limit Trip Lockout
14
Furnace lights briefly then shuts off; LED shows code 14 (ignition lockout).
Ignition Lockout After Failed Attempts
21
Furnace LED shows code 21; unit may not start or may behave erratically.
Gas Heating Lockout or Control Fault (Model-Dependent)
22
Furnace LED shows code 22; blower may run unexpectedly or not at all.
Blower Motor Fault or Lockout (Model-Dependent)
23
Furnace LED shows code 23; unit may not respond correctly to thermostat or may short-cycle.
Pressure Switch or Airflow Fault (Alternate Code Set)
24
Furnace LED shows code 24; thermostat may not control furnace properly.
Secondary Voltage Fuse Open or 24V Short
31
Furnace will not ignite; inducer may run briefly or not at all; LED flashes code 31 (pressure switch open or failed to close).
Pressure Switch Failed to Close
31 (Alt)
On some Keeprite models, code 31 indicates pressure switch open during run; furnace may shut off mid-cycle.
Loss of Draft During Operation
32
Furnace attempts to start but shuts down; LED shows code 32 (pressure switch stuck closed).
Pressure Switch Stuck Closed
32 (Alt)
On some Keeprite models, code 32 indicates low heat or high heat pressure switch fault on two-stage units.
Stage-Specific Pressure Switch Fault
33
Furnace starts, inducer and burner run briefly, then shuts down and blower runs continuously; status LED shows code 33 (limit circuit fault).
Open High Limit or Rollout Switch Lockout
33 (Alt)
On some Keeprite models, code 33 may indicate flame rollout switch open; burners shut off quickly after ignition.
Flame Rollout Condition
34
Furnace attempts to light but burners do not ignite; LED shows code 34 (ignition proving failure).
Ignition Failure / No Flame Sensed
41
Furnace LED shows code 41; blower may run at incorrect speed or not at all.
Blower Motor Speed or Fault (ECM Error)
42
Furnace LED shows code 42; inducer or blower may not respond correctly.
Inducer or Blower Fault (Communication or Relay Error)
43
Furnace LED shows code 43; unit may not modulate or stage correctly.
Gas Valve or Modulation Fault
44
Furnace LED shows code 44; unit may shut down unexpectedly or not start.
Secondary Limit or Condensate Overflow Fault
45
Furnace LED shows code 45; furnace may lock out and require power reset.
Control Board Internal Fault or Lockout
Symptom
Cold air blows from vents when the furnace runs, or air is only slightly warm.
No Heat / Lukewarm Air
Symptom
Furnace burners light but shut off after a few seconds; this repeats several times before lockout.
Flame Sensing Failure
Symptom
Furnace frequently trips the household circuit breaker.
Electrical Overload or Short Circuit
Symptom
Furnace inducer runs but shuts off before ignition; this repeats without heat.
Failed Pre-Purge / Safety Not Proving
Symptom
Furnace is very noisy during operation: rattling, squealing, or grinding sounds.
Mechanical Noise / Vibration
Symptom
Furnace makes a loud banging or booming noise at startup when burners ignite.
Delayed Ignition
Symptom
Furnace runs but produces insufficient heat; home never reaches set temperature.
Underheating / Low Capacity Output
Symptom
Furnace runs but some rooms are too hot while others are too cold.
Uneven Heating / Air Distribution Problem
Symptom
Furnace runs inducer and ignitor but burners never light; you may smell a faint gas odor near the furnace.
Gas Valve Not Opening
Symptom
Furnace short cycles: starts, runs for a few minutes, shuts off, then restarts frequently.
Short Cycling
Symptom
Furnace shuts off on very cold or very windy days but runs normally in mild weather.
Weather-Related Venting or Combustion Issue
Symptom
Furnace starts and stops repeatedly within seconds, never completing a full ignition sequence.
Rapid Cycling / Control Interruption
Symptom
Furnace vibrates excessively and can be felt throughout the house.
Excessive Vibration
Symptom
Furnace will not start at all; no blower, no inducer, no LED lights on the Keeprite control board.
No Power to Furnace
Symptom
Indoor blower runs continuously even when thermostat is not calling for heat or fan.
Blower Stuck On
Symptom
Strong chemical or burning smell when the furnace runs.
Overheating or Contaminant Burn-Off
Symptom
Thermostat is calling for heat but furnace does not respond; LED on furnace is on and shows no fault code.
No Response to Heat Call
Symptom
Water leaking from the base of the Keeprite furnace or from PVC vent connections.
Condensate Leak
| Error Code | Symptom | Fault Type | Guide |
|---|---|---|---|
| 11 |
Furnace does not respond to thermostat; LED shows code 11 (no previous code / no fault stored) but no heat.
|
No Call for Heat or Control Board Not Receiving Signal | View Details |
| 12 |
Furnace LED shows code 12 (blower on after power up) and blower may run briefly; furnace may not start heating immediately.
|
Normal Power-Up or Blower Delay Indication | View Details |
| 13 |
Furnace locks out with LED code 13 (limit circuit lockout) after repeated limit trips; blower may run continuously.
|
Repeated High Limit Trip Lockout | View Details |
| 14 |
Furnace lights briefly then shuts off; LED shows code 14 (ignition lockout).
|
Ignition Lockout After Failed Attempts | View Details |
| 21 |
Furnace LED shows code 21; unit may not start or may behave erratically.
|
Gas Heating Lockout or Control Fault (Model-Dependent) | View Details |
| 22 |
Furnace LED shows code 22; blower may run unexpectedly or not at all.
|
Blower Motor Fault or Lockout (Model-Dependent) | View Details |
| 23 |
Furnace LED shows code 23; unit may not respond correctly to thermostat or may short-cycle.
|
Pressure Switch or Airflow Fault (Alternate Code Set) | View Details |
| 24 |
Furnace LED shows code 24; thermostat may not control furnace properly.
|
Secondary Voltage Fuse Open or 24V Short | View Details |
| 31 |
Furnace will not ignite; inducer may run briefly or not at all; LED flashes code 31 (pressure switch open or failed to close).
|
Pressure Switch Failed to Close | View Details |
| 31 (Alt) |
On some Keeprite models, code 31 indicates pressure switch open during run; furnace may shut off mid-cycle.
|
Loss of Draft During Operation | View Details |
| 32 |
Furnace attempts to start but shuts down; LED shows code 32 (pressure switch stuck closed).
|
Pressure Switch Stuck Closed | View Details |
| 32 (Alt) |
On some Keeprite models, code 32 indicates low heat or high heat pressure switch fault on two-stage units.
|
Stage-Specific Pressure Switch Fault | View Details |
| 33 |
Furnace starts, inducer and burner run briefly, then shuts down and blower runs continuously; status LED shows code 33 (limit circuit fault).
|
Open High Limit or Rollout Switch Lockout | View Details |
| 33 (Alt) |
On some Keeprite models, code 33 may indicate flame rollout switch open; burners shut off quickly after ignition.
|
Flame Rollout Condition | View Details |
| 34 |
Furnace attempts to light but burners do not ignite; LED shows code 34 (ignition proving failure).
|
Ignition Failure / No Flame Sensed | View Details |
| 41 |
Furnace LED shows code 41; blower may run at incorrect speed or not at all.
|
Blower Motor Speed or Fault (ECM Error) | View Details |
| 42 |
Furnace LED shows code 42; inducer or blower may not respond correctly.
|
Inducer or Blower Fault (Communication or Relay Error) | View Details |
| 43 |
Furnace LED shows code 43; unit may not modulate or stage correctly.
|
Gas Valve or Modulation Fault | View Details |
| 44 |
Furnace LED shows code 44; unit may shut down unexpectedly or not start.
|
Secondary Limit or Condensate Overflow Fault | View Details |
| 45 |
Furnace LED shows code 45; furnace may lock out and require power reset.
|
Control Board Internal Fault or Lockout | View Details |
| – |
Cold air blows from vents when the furnace runs, or air is only slightly warm.
|
No Heat / Lukewarm Air | View Details |
| – |
Furnace burners light but shut off after a few seconds; this repeats several times before lockout.
|
Flame Sensing Failure | View Details |
| – |
Furnace frequently trips the household circuit breaker.
|
Electrical Overload or Short Circuit | View Details |
| – |
Furnace inducer runs but shuts off before ignition; this repeats without heat.
|
Failed Pre-Purge / Safety Not Proving | View Details |
| – |
Furnace is very noisy during operation: rattling, squealing, or grinding sounds.
|
Mechanical Noise / Vibration | View Details |
| – |
Furnace makes a loud banging or booming noise at startup when burners ignite.
|
Delayed Ignition | View Details |
| – |
Furnace runs but produces insufficient heat; home never reaches set temperature.
|
Underheating / Low Capacity Output | View Details |
| – |
Furnace runs but some rooms are too hot while others are too cold.
|
Uneven Heating / Air Distribution Problem | View Details |
| – |
Furnace runs inducer and ignitor but burners never light; you may smell a faint gas odor near the furnace.
|
Gas Valve Not Opening | View Details |
| – |
Furnace short cycles: starts, runs for a few minutes, shuts off, then restarts frequently.
|
Short Cycling | View Details |
| – |
Furnace shuts off on very cold or very windy days but runs normally in mild weather.
|
Weather-Related Venting or Combustion Issue | View Details |
| – |
Furnace starts and stops repeatedly within seconds, never completing a full ignition sequence.
|
Rapid Cycling / Control Interruption | View Details |
| – |
Furnace vibrates excessively and can be felt throughout the house.
|
Excessive Vibration | View Details |
| – |
Furnace will not start at all; no blower, no inducer, no LED lights on the Keeprite control board.
|
No Power to Furnace | View Details |
| – |
Indoor blower runs continuously even when thermostat is not calling for heat or fan.
|
Blower Stuck On | View Details |
| – |
Strong chemical or burning smell when the furnace runs.
|
Overheating or Contaminant Burn-Off | View Details |
| – |
Thermostat is calling for heat but furnace does not respond; LED on furnace is on and shows no fault code.
|
No Response to Heat Call | View Details |
| – |
Water leaking from the base of the Keeprite furnace or from PVC vent connections.
|
Condensate Leak | View Details |
No matching codes found
Advertisements