E047 🟡 Repair Required
Navien Error Code E047: DHW Thermistor Open/Short
⚠️ Your Navien tankless water heater has detected a problem with the DHW thermistor and has shut down to prevent damage.
How to Fix Navien Code E047
- Check if the error persists after turning the power off and back on again.
- Inspect the wiring harness connecting the DHW thermistor to the control board for any signs of damage or corrosion.
- If the error remains, contact a licensed HVAC technician to diagnose and repair the issue.
What Does Navien Error Code E047 Mean?
The E047 error on your Navien tankless water heater indicates an open or short circuit in the DHW (Domestic Hot Water) thermistor. This component is responsible for measuring the water temperature and signaling the control board to adjust the heating process. When the thermistor fails, it can cause the system to shut down to prevent overheating or freezing. Don't worry, this isn't a gas leak or fire risk, but it does require professional attention.
Common Causes of Navien Code E047
- A broken or faulty DHW thermistor
- Wiring issues between the thermistor and the control board
- Corrosion or damage to the thermistor due to hard water or scale buildup
Applicable Navien Models
Source Documentation
This error code is documented in 6 official Navien technical manuals.
NFB-H Installation & Operation ManualPage 116
ReasonExhaust Thermistor
ActionCheck thermistor connector.
Navien NCB-H Installation & Operation ManualPage 129
ReasonExhaust Thermistor
ActionContact technical support at 1-800-519-8794.
Navien NFB-H Installation & Operation ManualPage 116
ReasonExhaust Thermistor
ActionCheck thermistor connector.
Navien NFC-H Installation & Operation ManualPage 127
ReasonAbnormal operation: exhaust thermostat
ActionManual RESET Auto RESET
Navien NHB-H Installation & Operation ManualPage 119
ReasonExhaust Thermistor
ActionCheck thermistor connector.
Navien NPF Installation & Operation ManualPage 126
ReasonAbnormal exhaust temperature sensor operation
ActionThis error occurs when the exhaust temperature sensor does not operate properly. ● Turn off the furnace, turn it on again and check if the furnace operates properly. ● If the furnace is continuously inoperable, contact Technical Support at 1-800-519-8794.
Need a Pro to Fix Navien Code E047?
A licensed HVAC technician can diagnose and fix this issue quickly.
Find a Licensed Tech Near You →Replacement Parts for Navien Tankless Water Heater Code E047
DHW Thermistor OEM: 3200010001