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Navien E760 — Flushing and service alarm
Flushing and service alarm — the unit is telling you scheduled maintenance is due.
E760 is the one code on this list that is not a fault. The unit tracks its own running hours and raises E760 when it judges a descale and service is due. Nothing has broken. Ignoring it for long enough, however, is how the genuine faults on this page get created, because scale is behind a good share of them.
What causes E760
1. Scheduled maintenance has come due
The unit reached the running hours its manufacturer sets for a descale and inspection. This is the normal reason and the code clears once the service is done and the reminder is reset.
2. Massachusetts hard water making it arrive sooner
Water hardness varies across the South Shore, and harder water scales an exchanger faster. Some homes see this reminder noticeably sooner than a manual would suggest.
3. The reminder was never reset after a previous service
If a past service did not clear the counter, the code returns even though the work was done. Worth asking about before booking anything.
What you can safely check first
- Check whether hot water performance has changed — longer waits or lower output alongside E760 suggest scale is already affecting it.
- Find out when the unit was last descaled, if ever. Many units have never had it done.
- You can keep using the unit. E760 is a reminder, not a lockout.
When to stop and call us
Book the service rather than dismissing the reminder. A descale is a planned, predictable visit; the failures that follow neglected scale are neither, and they tend to arrive in the middle of winter.
E760 showing on your Navien?
Book the flush and annual service. We descale the heat exchanger, clean the inlet filter, check the condensate path, and reset the service counter.
Navien E760 FAQs
What does Navien error code E760 mean?
It is the flushing and service alarm. The unit has reached the running hours where a descale and inspection are due. It is a maintenance reminder rather than a breakdown, and the unit keeps working.
Can I keep using the water heater with E760 showing?
Yes. E760 is a reminder, not a safety lockout, so hot water continues. It is worth booking the service though, because the scale it is warning about causes the genuine faults later.
What does a Navien flush actually involve?
Circulating a descaling solution through the heat exchanger to remove mineral buildup, cleaning the inlet filter, checking the condensate path, and confirming the unit fires and holds temperature properly afterwards.
How often should a tankless unit be descaled?
It depends on water hardness and use rather than a single number, which is why the unit tracks its own hours and raises E760. If yours has never been descaled, that is the answer regardless of the interval.
How much does an E760 diagnosis cost?
The $99 service fee sends a licensed technician out to diagnose the problem. Approve the repair on the spot and the fee is not charged at all; decline it and the $99 covers the visit. What the repair itself costs depends on what we find, and you get that price before any work starts rather than after.
Other codes on this unit? See all Navien error codes.
Why South Shore homeowners choose Johnson Bros.
Book the Navien flush and annual service
E760 is the maintenance reminder, not a breakdown. You get the price for the flush and service before we start.
Not sure what's wrong? Send a photo or videoBooking online is the quickest way to hold the next open appointment. Call instead if it is urgent and you would rather talk to someone.
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Book the Navien flush and annual service
E760 is the maintenance reminder, not a breakdown. You get the price for the flush and service before we start.
Call for urgent help now. Book online when you want the next available fit for your schedule.