Navien Error Code Sys Supply Temp: Status Information item 8 – Sys Supply Temp (Combi Boiler)
Navien error code Sys Supply Temp on a combi boiler means: Status Information item 8 - Sys Supply Temp. It is also called Navien diagnostic code Sys Supply Temp.
Homeowner? What Navien code Sys Supply Temp means for you
Usually minor Your combi boiler is reporting: Status Information item 8 - Sys Supply Temp. This code is usually informational or minor. The safe checks below often clear it; call us if it keeps showing up.
Safe things you can check yourself
- Check the thermostat: right mode (Heat or Cool), set a few degrees past room temperature, and fresh batteries if it uses them.
- Make sure the unit has power: its on/off switch (often looks like a light switch near the unit) is ON and the breaker in the electrical panel is not tripped.
- Look at the pressure gauge on the boiler. If it reads much lower than usual or near zero, or water is leaking, call a technician.
- Outside, make sure the intake and exhaust pipes or vent cap are not blocked by snow, ice, leaves or a nest.
- Check that the boiler gas valve is open (handle in line with the pipe).
- Try one reset: turn the power off for 30 seconds, then back on. If the code comes back, stop resetting and call a technician.
- If only hot water is missing, check that the hot water tap is open far enough to start the heater.
Call (647) 657-2977Book a service call
Licensed technicians serving Vaughan, Toronto and the GTA.
What does Navien error code Sys Supply Temp mean?
System supply temperature (F). Read-only item 8 in the Status Information menu.
Applies to: NCB-190/060H to NCB-250/150H
Navien models that use code Sys Supply Temp
NCB-190/060HNCB-190/080HNCB-240/110HNCB-240/130HNCB-250/150H
Other Navien Combi Boiler codes
All Navien Combi Boiler error codes →
Navien code Sys Supply Temp: homeowner questions
What does Navien code Sys Supply Temp mean?
Status Information item 8 - Sys Supply Temp. System supply temperature (F). Read-only item 8 in the Status Information menu.
Is it safe to keep using my combi boiler with code Sys Supply Temp?
Usually yes. Code Sys Supply Temp is normally minor, but if it keeps coming back have it checked.
Can I reset Navien code Sys Supply Temp myself?
You can try one reset (power off for 30 seconds, then on). If Navien code Sys Supply Temp comes back, the cause is still there and a licensed technician should check it.
Who can fix Navien code Sys Supply Temp near me?
Aurora Star Tech Inc. repairs Navien combi boilers in Vaughan, Toronto and across the GTA. Call (647) 657-2977 or book a service call online.
Homeowner help: Tankless Water Heater No Hot Water: What to Check · Boiler Not Heating: What to Check
Troubleshooting guides
- Change gas type with DIP switch 2 Navien · Combi Boiler
- Change installer parameters (password 1234) Navien · Combi Boiler
- Force a fixed firing rate with DIP switch 1 Navien · Combi Boiler
- Force minimum or maximum firing (special operations) Navien · Combi Boiler
- Hot water is cold or turns cold - Navien NCB-H Navien · Combi Boiler
- Hot water not hot enough or too hot - Navien NCB-H Navien · Combi Boiler
- No space heating - Navien NCB-H Navien · Combi Boiler
- No water from hot water tap - Navien NCB-H Navien · Combi Boiler
- Open the service / installer menu (Back + Menu) Navien · Combi Boiler
- Purge air from the heating piping (Air Purge Mode) Navien · Combi Boiler
- Read live data (Status Information menu) Navien · Combi Boiler
- Read the error history Navien · Combi Boiler
- Reset one parameter to its default Navien · Combi Boiler
- Run test mode (fan, pumps, valves, venturi) Navien · Combi Boiler
- Set the altitude with DIP switch 2 Navien · Combi Boiler
Source: Navien NCB-H User's Information Manual (V1.0 Apr 2024), 3.3 Accessing Basic Menu Items, p.12-13. Written in our own words as a summary; always check the original manual.
General guidance for qualified technicians. The manufacturer's installation and service manual and local codes always take priority. Aurora Star Tech is not affiliated with, endorsed by or sponsored by any equipment manufacturer; brand and model names are used only to identify equipment and belong to their owners.