Navien Error Code E860: Replace the circulator filter with a new one, and then reset the furnace.

How to Fix Navien Code E860

1. Step 1: Locate the circulator pump filter. Consult your Navien owner's manual for its exact location, as it varies by model. It's usually near the circulator pump.
2. Step 2: If you can easily access the filter housing, carefully remove and inspect the filter. Rinse it thoroughly under running water to remove any visible debris. If the filter is heavily soiled or damaged, it's best to replace it.
3. Step 3: After cleaning or replacing the filter, reset the Navien unit by turning it off and then back on. Observe if the E860 error code reappears. If it does, it indicates a more serious problem requiring professional attention. Call a qualified HVAC technician to diagnose the underlying issue.

How to Reset Navien Code E860

1. Turn off the unit using the power button on the front panel.
2. Turn off the gas supply valve.
3. Turn off the circuit breaker supplying power to the unit. Wait 30 seconds.
4. Restore power at the breaker, then open the gas valve.
5. Turn the unit back on. If the error returns, the underlying issue needs repair.

Resetting clears the code from the display but does not fix the underlying fault. If the code returns after reset, proceed to the diagnostic steps above.

What Does Navien Error Code E860 Mean?

The Navien E860 error code indicates a problem with the circulation of water within your heating system. Specifically, it's telling you that the system believes the circulator pump filter is blocked or dirty. This filter is designed to catch debris and prevent it from damaging the pump and other sensitive components inside your Navien unit. When the filter gets clogged, it restricts water flow, which can lead to overheating, reduced heating performance, and eventually, a complete system shutdown. Think of it like a clogged artery in your body – it prevents proper circulation and can cause serious problems. Addressing this issue promptly will help maintain the efficiency and lifespan of your Navien system.

Common Causes

• Clogged circulator pump filter due to accumulated debris (most common)
• Air trapped in the system, hindering water flow
• Malfunctioning circulator pump, unable to overcome filter resistance
• Scale buildup within the heat exchanger, restricting water flow

Diagnostic Steps

Replacement Parts

Related Codes on Same Models

Other codes that affect the same Navien model families as E860.