Error Code Guide
Explore our Error Code Guide for insights into common issues with your water heater. Keep in mind, your specific model may have unique codes. Refer to your manual for accurate troubleshooting.
Navien
Error code 003
Ignition Failure
Fix – Call a Licensed Gas Fitter/Company. What has happened is the unit has a part failure.
Error Code 004
False Flame Detection
Ensure that the electrical cord is properly grounded and plugged in. Call SPS Plumbing for further troubleshooting.
Error Code 012
Flame Loss
- Check if the main gas valve is open- Check the intake air filter- Check the power supply
Error code 016
Overheating Heat Exchanger
Turn OFF the unit, wait at least 30 min, and then restart. Clean the inlet water filter and strainer. Flush it if required.
error code 030
Abnormal Exhaust Temperature
You will need to call a licensed HVAC to handle this. This error code should only be checked by a licensed technician.
Error code 047
Abnormal Operation: Exhaust Thermostat
For your safety and the health of your equipment, call SPS Plumbing now for further troubleshooting
Error code 060
Abnormal Operation: Dual Venturi
For your safety and the health of your equipment, call SPS Plumbing now for further troubleshooting
error code 109
Abnormal Operation: Fan Motor
Check and clean the intake air filter. For your safety and the health of your equipment, call SPS Plumbing now for further troubleshooting
Error code 110
Abnormal Air Pressure
Ensure the exhaust is free of obstructions. Clean the intake filter (might want to have a trained technician complete this task)
Error code 407
Hot Water Outlet Thermistor Open or Short Circuit
You will need to call a licensed HVAC to handle this. This error code should only be checked by a licensed technician.
error code 421
Hot Water Outlet Thermistor Open or Short Circuit
You will need to call a licensed HVAC to handle this. This error code should only be checked by a licensed technician.
Error code 432
Abnormal Cold Water Inlet2: Thermistor Open or Short
For your safety and the health of your equipment, Call SPS Plumbing! for further troubleshooting
Error code 434
Abnormal Water Adjustment Valve Open or Short
For your safety and the health of your equipment, Call SPS Plumbing now for further troubleshooting
error code 438
Abnormal Circulation Pump ("A" Models Only)
For your safety and the health of your equipment, Call SPS Plumbing now for further troubleshooting
Error code 439
Abnormal Operation: Flow Sensor
For your safety and the health of your equipment, Call SPS Plumbing now for further troubleshooting
Error code 441
Abnormal Hot Water Inlet2: Thermistor Open or Short
For your safety and the health of your equipment, Call SPS Plumbing now for further troubleshooting
error code 445
Abnormal Mixing Valve Open or Short
For your safety and the health of your equipment, Call SPS Plumbing now for further troubleshooting
Error code 515
Abnormal PCB communication
For your safety and the health of your equipment, Call SPS Plumbing now for further troubleshooting
Error code 517
Abnormal Operation: DIP Switch Setting Incorrect
For your safety and the health of your equipment, Call SPS Plumbing now for further troubleshooting
error code 593
Abnormal Panel Key
For your safety and the health of your equipment, Call SPS Plumbing now for further troubleshooting
Error code 594
Abnormal Operation: EEPROM
For your safety and the health of your equipment, Call SPS Plumbing now for further troubleshooting
Error code 736
Cascade Communication
For your safety and the health of your equipment, Call SPS Plumbing now for further troubleshooting
error code 740
Abnormal Operation: Outdoor Temperature Sensor
For your safety and the health of your equipment, Call SPS Plumbing now for further troubleshooting
Error code 760
Flushing / Service Alarm
A heat exchanger flush is required. Call SPS Plumbing today to shedule a flush.
Error code 782
Abnormal Operation: Main Panel Communication
Call Navien tech support 1-800-519-8794 or call us, a licensed HVAC to handle this. This error code should only be checked by a licensed technician.
error code 785
Abnormal Flow Sensor Operation
Check the Cold Water line. Check the Flow Switch connection