Navien Tankless Error Code E060: Causes and Fix

A Navien tankless unit that flashes E060 has already made a decision: it shut the burner off on purpose. The control board watches how air and gas mix before the flame, and when that reading drifts outside a safe window, it stops firing and posts the code. So the hot water stops, but the real event is happening at the combustion system, not at the temperature dial.

What E060 actually reports

The starting assumption a lot of owners have is that E060 means low gas or a gas leak. That is close but not exact. On Navien condensing units, E060 flags an abnormality in the dual venturi, the part that meters the air-to-gas ratio feeding the burner. Some Navien documentation and forum posts describe it broadly as an abnormal gas or gas-supply condition, and that is why sources disagree in wording. The board is genuinely checking gas delivery and the venturi together. Both live in the same safety loop.

Because the code straddles two areas, the air-gas mixer and the gas feed, one owner will fix it by opening a half-closed gas valve and the next will need a new venturi. That is not sources contradicting each other. It is the same safety check catching two different root problems.

It helps to picture what the venturi does. As the burner draws air, the venturi shapes that airflow and pulls in the right slug of gas to match it, so the flame burns clean instead of rich or lean. On a dual venturi model the board watches switch states inside that assembly to confirm the mix is where it should be. When a switch reports the wrong state, or the airflow and gas cannot line up because supply is weak, the reading falls outside the safe window and E060 fires. That is why the fix is never one universal step. You are chasing whichever part of the mix broke.

Most likely causes, in order

Field reports and the NPE service manual line up reasonably well on the ranking. Start at the top and work down. The cheap and obvious causes are first for a reason.

How to reset and clear it

Clearing the code is simple. Fixing the cause is the part that matters. Reset first so you can see whether the fault is a one-time hiccup or a standing problem.

1. Power cycle the unit

   Flip the power switch off, wait roughly 30 seconds so the board fully powers down, then switch it back on. On many panels you can instead press and hold the reset or power button. The E060 lockout clears.

2. Confirm gas is on

   Before you call anyone, verify the manual gas valve at the heater is fully open and that other gas appliances in the house still light. A dead furnace or range points at a supply-wide issue, not the heater.

3. Watch for the return

   Run hot water and see if E060 comes back. If it clears and stays gone, you likely had a transient. If it returns within a cycle or two, stop resetting and move to diagnosis. Repeated resets on a combustion fault are not a fix.

4. Read the error history

   Navien units store a fault log in the service menu. A tech can pull how often E060 has fired and whether other combustion codes ride alongside it, which narrows venturi versus gas supply fast.

DIY-safe vs licensed-tech territory

There is a clean line here. Anything that does not touch gas pressure or the burner is fair game for a homeowner. Anything that does belongs to a licensed pro, and in most jurisdictions gas work legally requires one.

What the parts cost

Prices swing with model and region, so treat these as a planning range rather than a quote. The venturi is the expensive line item, and it is also the part most likely to be the actual culprit on a repeat E060.

Reading the sub-code

Some Navien units display E060 with a trailing digit, shown as a sub-code 1 through 3. That number points at which internal switch state tripped inside the dual venturi. You do not need to decode it yourself, but note it before you reset. A tech uses it to jump straight to the failed switch instead of testing the whole assembly. If your panel only shows a flat E060 with no sub-number, that is normal for some model years too.

One more thing worth saying plainly: sources online range from calling E060 a pure gas fault to calling it strictly a venturi failure. Both descriptions are pointing at the same safety loop. The honest read is that the code covers the whole air-and-gas mixing job, and the fix depends on which link in that chain is weak. Do not let a confident blog post talk you into buying a venturi before someone checks gas pressure and grounding, because those are cheaper and get missed.

The Navien NPE service manual lays out the tech-side checklist in a specific order, and it is worth knowing so you can tell whether whoever shows up is actually diagnosing or just guessing. It has them confirm the main gas valve is open, verify gas pressure is within the operating range, inspect the gas system and orifice, run the dual venturi to check operation, confirm the dipswitch settings match the model and gas type, and tighten the ground connections on the heat exchanger. Notice that the venturi swap is not step one. Several cheaper checks come first. A good tech follows that sequence instead of reaching for the most expensive part.

Keeping E060 from coming back

Combustion faults reward maintenance more than water-side faults do. The venturi and its air path are sensitive to dust, condensate, and gas quality, and a clean intake with steady gas pressure keeps the mix in range.

If you have reset the unit, confirmed the gas is on, and E060 still returns, the next move is a phone call, not another power cycle. The dual venturi is the heart of the burner's air-gas control, and once it is genuinely failing, the board will keep locking out until the part is replaced or the gas supply is corrected.