Noritz Code 11: Ignition failure
Code 11 is listed as 'Ignition failure.' for Noritz Tankless Water Heater. Verify the exact model and controller before acting.
Source checked 2026-05-01Error Codes
Browse published fault-code records by brand, product and displayed code.
Each record starts with the source meaning, then separates applicability, owner-safe actions, operating uncertainty and qualified-service boundaries. A matching code string alone is not enough: confirm the brand, product, model and controller before acting.
Noritz Code 12: Flame loss
Code 12 is listed as 'Flame loss.' for Noritz Tankless Water Heater. Verify the exact model and controller before acting.
Source checked 2026-05-01Noritz Code 14: Significant heat-exchanger overheat
Code 14 is listed as 'Significant heat-exchanger overheat.' for Noritz Tankless Water Heater. Verify the exact model and controller before acting.
Source checked 2026-05-01Noritz Code 16: Outlet water temperature has spiked abnormally high
Code 16 is listed as 'Outlet water temperature has spiked abnormally high.' for Noritz Tankless Water Heater. Verify the exact model and controller before acting.
Source checked 2026-05-01Noritz Code 20: High-limit switch has been triggered
Code 20 is listed as 'High-limit switch has been triggered.' for Noritz Tankless Water Heater. Verify the exact model and controller before acting.
Source checked 2026-05-01Noritz Code 29: Condensate drain problem
Code 29 is listed as 'Condensate drain problem.' for Noritz Tankless Water Heater. Verify the exact model and controller before acting.
Source checked 2026-05-01Noritz Code 45: NRCP/CB model abnormality identified by Noritz as Error Code 45
Code 45 is listed as 'NRCP/CB model abnormality identified by Noritz as Error Code 45.' for Noritz Tankless Water Heater. Verify the exact model and controller before acting.
Source checked 2026-05-01Noritz Code 67: AGM air-gas mixer abnormality
Code 67 is listed as 'AGM air-gas mixer abnormality.' for Noritz Tankless Water Heater. Verify the exact model and controller before acting.
Source checked 2026-05-01Noritz Code 71: Gas valve circuit abnormality
Code 71 is listed as 'Gas valve circuit abnormality.' for Noritz Tankless Water Heater. Verify the exact model and controller before acting.
Source checked 2026-05-01Noritz Code 73: Circuit-board setting issue
Code 73 is listed as 'Circuit-board setting issue.' for Noritz Tankless Water Heater. Verify the exact model and controller before acting.
Source checked 2026-05-01Thermo King Alarm - C -: Communications Failure, Microprocessor to In-Cab Control Box
Alarm - C - is listed as 'Communications Failure, Microprocessor to In-Cab Control Box' for Thermo King Truck/Trailer Refrigeration Unit. Verify the exact model and controller before acting.
Source checked 2026-05-01Thermo King Alarm 845: Starter Relay Error
Alarm 845 is listed as 'Starter Relay Error' for Thermo King Truck/Trailer Refrigeration Unit. Verify the exact model and controller before acting.
Source checked 2026-05-01Thermo King Alarm 846: T50 Switch Error
Alarm 846 is listed as 'T50 Switch Error' for Thermo King Truck/Trailer Refrigeration Unit. Verify the exact model and controller before acting.
Source checked 2026-05-01Thermo King Alarm 847: Variant Coding Error
Alarm 847 is listed as 'Variant Coding Error' for Thermo King Truck/Trailer Refrigeration Unit. Verify the exact model and controller before acting.
Source checked 2026-05-01Thermo King Alarm 853: Engine Overspeed (No DTC)
Alarm 853 is listed as 'Engine Overspeed (No DTC)' for Thermo King Truck/Trailer Refrigeration Unit. Verify the exact model and controller before acting.
Source checked 2026-05-01Thermo King Alarm 854: Engine Protection Self Shutdown
Alarm 854 is listed as 'Engine Protection Self Shutdown' for Thermo King Truck/Trailer Refrigeration Unit. Verify the exact model and controller before acting.
Source checked 2026-05-01Thermo King Alarm 899: Unknown ECU Fault
Alarm 899 is listed as 'Unknown ECU Fault' for Thermo King Truck/Trailer Refrigeration Unit. Verify the exact model and controller before acting.
Source checked 2026-05-01Thermo King Alarm dr1: Door 1 Open/Door Switch 1 Failure
Alarm dr1 is listed as 'Door 1 Open/Door Switch 1 Failure' for Thermo King Truck/Trailer Refrigeration Unit. Verify the exact model and controller before acting.
Source checked 2026-05-01Thermo King Alarm dr2: Door 2 Open/Door Switch 2 Failure
Alarm dr2 is listed as 'Door 2 Open/Door Switch 2 Failure' for Thermo King Truck/Trailer Refrigeration Unit. Verify the exact model and controller before acting.
Source checked 2026-05-01Thermo King Alarm HP: High Discharge Pressure
Alarm HP is listed as 'High Discharge Pressure' for Thermo King Truck/Trailer Refrigeration Unit. Verify the exact model and controller before acting.
Source checked 2026-05-01Thermo King Alarm LP: Low Suction Pressure
Alarm LP is listed as 'Low Suction Pressure' for Thermo King Truck/Trailer Refrigeration Unit. Verify the exact model and controller before acting.
Source checked 2026-05-01Thermo King Alarm P1E: Return Air Temperature Sensor Fault
Alarm P1E is listed as 'Return Air Temperature Sensor Fault' for Thermo King Truck/Trailer Refrigeration Unit. Verify the exact model and controller before acting.
Source checked 2026-05-01Thermo King Alarm SOF: Microprocessor Software Failure
Alarm SOF is listed as 'Microprocessor Software Failure' for Thermo King Truck/Trailer Refrigeration Unit. Verify the exact model and controller before acting.
Source checked 2026-05-01Thermo King Alarm tEP: Electric Standby Motor Thermal Protection Alarm
Alarm tEP is listed as 'Electric Standby Motor Thermal Protection Alarm' for Thermo King Truck/Trailer Refrigeration Unit. Verify the exact model and controller before acting.
Source checked 2026-05-01