Navien Error Code Anti-freeze icon: Anti-freeze mode active (Combi Boiler)

Homeowner? What Navien code Anti-freeze icon means for you

Usually minor Your combi boiler is reporting: Anti-freeze mode active. 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.