Takagi
Takagi Water Heaters Error Codes
Complete list of fault codes and troubleshooting guides. Use the search below to find your specific error.
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101
Takagi water heater attempts to start but shuts down quickly with error 101 on the remote controller.
Combustion Abnormality / Improper Combustion
103
Takagi unit shuts down with error 103; water temperature may fluctuate before shutdown.
Insufficient Circulation / Heat Exchanger Overheat (Scale Buildup)
111
Water heater will not ignite; no hot water. Error 111 displayed on Takagi controller.
Ignition Failure
1111
Takagi controller displays error 1111 and the unit will not operate.
Ignition Failure (Extended / Multiple Attempts)
121
Water heater stops during operation and shows error 121 on the Takagi remote.
Flame Loss During Operation
1211
Takagi controller shows error 1211; unit may start then shut down repeatedly.
Repeated Flame Loss / Flame Detection Failure
311
Takagi water heater displays error 311 and will not fire.
Outlet Thermistor Failure (Open or Short)
321
Error 321 appears on the Takagi remote; unit does not operate.
Inlet Thermistor Failure (Open or Short)
331
Takagi controller shows error 331; heater will not run.
Heat Exchanger Thermistor Failure
341
Error 341 displayed; unit does not start.
Exhaust Thermistor Failure
391
Takagi water heater shows error 391; unit will not operate.
Mixing Thermistor Failure (if equipped)
441
Error 441 appears; unit shuts down or will not start.
Flow Sensor Failure
510
Takagi controller shows error 510; unit will not fire.
Abnormal Gas Valve Signal / Gas Valve Failure
511
Error 511 displayed; unit does not ignite.
Gas Solenoid Valve Circuit Error
611
Takagi water heater shows error 611; fan does not run or runs abnormally.
Combustion Fan Motor Failure
651
Error 651 displayed; unit will not operate.
Flow Adjustment Valve Failure (if equipped)
661
Takagi controller shows error 661; unit may not modulate correctly or may not fire.
Bypass Valve Failure (if equipped)
701
Error 701 displayed; unit will not operate.
Remote Controller Communication Error
721
Takagi water heater shows error 721; unit does not respond to remote.
Remote Controller Internal Error
741
Error 741 displayed on multi-unit Takagi system; communication between units is lost.
Cascade Communication Error
761
Takagi controller shows error 761 on a recirculation-capable model.
Recirculation Pump Control Error
991
Takagi water heater displays error 991; unit shuts down.
Flue Blockage / Abnormal Combustion (High CO Risk)
Symptom
Condensation or water dripping from the exhaust vent of the Takagi water heater.
Condensate Management / Venting Issue
Symptom
Intermittent hot water; Takagi unit cycles on and off rapidly, causing temperature swings.
Short Cycling / Low Flow Operation
Symptom
No hot water at any fixture; Takagi water heater appears completely dead (no display, no response).
No Power to Unit
Symptom
Takagi water heater display or remote is blank, but power to the outlet is confirmed.
Control Board or Display Failure
Symptom
Takagi water heater does not start when a single low-flow faucet (e.g., modern lavatory) is opened.
Minimum Flow Activation Issue
Symptom
Takagi water heater emits a burning or electrical smell during operation.
Overheating Electrical Component or Wiring
Symptom
Takagi water heater emits a strong gas smell near the unit.
Gas Leak at Heater Connections
Symptom
Takagi water heater frequently shuts off when multiple fixtures are used at once.
Capacity / Flow Limitation
Symptom
Takagi water heater frequently trips the household breaker or GFCI.
Electrical Overload or Ground Fault
Symptom
Takagi water heater installed outdoors will not operate in cold weather; may show no code or intermittent operation.
Freeze Protection / Low Ambient Temperature Issue
Symptom
Takagi water heater is very noisy; loud fan or vibration sounds during operation.
Excessive Vibration / Fan Noise
Symptom
Takagi water heater makes loud banging or popping noises during operation.
Scale Buildup in Heat Exchanger
Symptom
Takagi water heater runs but produces a rumbling or roaring flame sound.
Abnormal Combustion / Burner Noise
Symptom
Water heater is leaking from the bottom of the Takagi unit.
Internal Water Leak
Symptom
Water is excessively hot; sudden spikes in temperature from Takagi water heater.
Overheating / Temperature Overshoot
Symptom
Water is warm but not hot enough, even with Takagi temperature set high.
Insufficient Outlet Temperature
Symptom
Water leaking from piping connections directly under the Takagi water heater.
External Connection Leak
| Error Code | Symptom | Fault Type | Guide |
|---|---|---|---|
| 101 |
Takagi water heater attempts to start but shuts down quickly with error 101 on the remote controller.
|
Combustion Abnormality / Improper Combustion | View Details |
| 103 |
Takagi unit shuts down with error 103; water temperature may fluctuate before shutdown.
|
Insufficient Circulation / Heat Exchanger Overheat (Scale Buildup) | View Details |
| 111 |
Water heater will not ignite; no hot water. Error 111 displayed on Takagi controller.
|
Ignition Failure | View Details |
| 1111 |
Takagi controller displays error 1111 and the unit will not operate.
|
Ignition Failure (Extended / Multiple Attempts) | View Details |
| 121 |
Water heater stops during operation and shows error 121 on the Takagi remote.
|
Flame Loss During Operation | View Details |
| 1211 |
Takagi controller shows error 1211; unit may start then shut down repeatedly.
|
Repeated Flame Loss / Flame Detection Failure | View Details |
| 311 |
Takagi water heater displays error 311 and will not fire.
|
Outlet Thermistor Failure (Open or Short) | View Details |
| 321 |
Error 321 appears on the Takagi remote; unit does not operate.
|
Inlet Thermistor Failure (Open or Short) | View Details |
| 331 |
Takagi controller shows error 331; heater will not run.
|
Heat Exchanger Thermistor Failure | View Details |
| 341 |
Error 341 displayed; unit does not start.
|
Exhaust Thermistor Failure | View Details |
| 391 |
Takagi water heater shows error 391; unit will not operate.
|
Mixing Thermistor Failure (if equipped) | View Details |
| 441 |
Error 441 appears; unit shuts down or will not start.
|
Flow Sensor Failure | View Details |
| 510 |
Takagi controller shows error 510; unit will not fire.
|
Abnormal Gas Valve Signal / Gas Valve Failure | View Details |
| 511 |
Error 511 displayed; unit does not ignite.
|
Gas Solenoid Valve Circuit Error | View Details |
| 611 |
Takagi water heater shows error 611; fan does not run or runs abnormally.
|
Combustion Fan Motor Failure | View Details |
| 651 |
Error 651 displayed; unit will not operate.
|
Flow Adjustment Valve Failure (if equipped) | View Details |
| 661 |
Takagi controller shows error 661; unit may not modulate correctly or may not fire.
|
Bypass Valve Failure (if equipped) | View Details |
| 701 |
Error 701 displayed; unit will not operate.
|
Remote Controller Communication Error | View Details |
| 721 |
Takagi water heater shows error 721; unit does not respond to remote.
|
Remote Controller Internal Error | View Details |
| 741 |
Error 741 displayed on multi-unit Takagi system; communication between units is lost.
|
Cascade Communication Error | View Details |
| 761 |
Takagi controller shows error 761 on a recirculation-capable model.
|
Recirculation Pump Control Error | View Details |
| 991 |
Takagi water heater displays error 991; unit shuts down.
|
Flue Blockage / Abnormal Combustion (High CO Risk) | View Details |
| – |
Condensation or water dripping from the exhaust vent of the Takagi water heater.
|
Condensate Management / Venting Issue | View Details |
| – |
Intermittent hot water; Takagi unit cycles on and off rapidly, causing temperature swings.
|
Short Cycling / Low Flow Operation | View Details |
| – |
No hot water at any fixture; Takagi water heater appears completely dead (no display, no response).
|
No Power to Unit | View Details |
| – |
Takagi water heater display or remote is blank, but power to the outlet is confirmed.
|
Control Board or Display Failure | View Details |
| – |
Takagi water heater does not start when a single low-flow faucet (e.g., modern lavatory) is opened.
|
Minimum Flow Activation Issue | View Details |
| – |
Takagi water heater emits a burning or electrical smell during operation.
|
Overheating Electrical Component or Wiring | View Details |
| – |
Takagi water heater emits a strong gas smell near the unit.
|
Gas Leak at Heater Connections | View Details |
| – |
Takagi water heater frequently shuts off when multiple fixtures are used at once.
|
Capacity / Flow Limitation | View Details |
| – |
Takagi water heater frequently trips the household breaker or GFCI.
|
Electrical Overload or Ground Fault | View Details |
| – |
Takagi water heater installed outdoors will not operate in cold weather; may show no code or intermittent operation.
|
Freeze Protection / Low Ambient Temperature Issue | View Details |
| – |
Takagi water heater is very noisy; loud fan or vibration sounds during operation.
|
Excessive Vibration / Fan Noise | View Details |
| – |
Takagi water heater makes loud banging or popping noises during operation.
|
Scale Buildup in Heat Exchanger | View Details |
| – |
Takagi water heater runs but produces a rumbling or roaring flame sound.
|
Abnormal Combustion / Burner Noise | View Details |
| – |
Water heater is leaking from the bottom of the Takagi unit.
|
Internal Water Leak | View Details |
| – |
Water is excessively hot; sudden spikes in temperature from Takagi water heater.
|
Overheating / Temperature Overshoot | View Details |
| – |
Water is warm but not hot enough, even with Takagi temperature set high.
|
Insufficient Outlet Temperature | View Details |
| – |
Water leaking from piping connections directly under the Takagi water heater.
|
External Connection Leak | View Details |
No matching codes found
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