On the covered Noritz tankless water heater, 93, EC93 means the built-in condensate neutralizer has reached the end of its effective lifespan. Performance may be reduced until it is replaced. It applies to certain condensing models such as the NRC111 and NCC199. First, note the model number against the list in Noritz's article.
Differential
Likely causes of “Noritz tankless water heater code 93, EC93”, and how to tell them apart
- 1
The condensate neutralizer has reached its end of life
What separates it Performance may be reduced
How to confirm Replace the neutralizer
- 2
A condensing model
What separates it The code applies to certain models
How to confirm Check your model number against Noritz's list
- 3
Years of use
What separates it The neutralizer is consumed over time
How to confirm Replace it on schedule
- 4
A skipped service
What separates it The neutralizer was not renewed
How to confirm Service the unit
- 5
A reset not done after replacement
What separates it The code remains
How to confirm Follow the reset procedure
Before you touch a setting
Record this first — changing settings destroys the evidence
- When the neutralizer was last replaced
- The model number
Try in this order
0 of 8 completedWhat to do first
ReversibleNote the model number against the list in Noritz's article.
Correct only the documented fault domain
ReversibleNoritz says to replace the neutralizer (part number SKD7466) and follow the reset procedure included with the new part.
Note the model number
ReversibleAgainst Noritz's list.
Order the neutralizer
ReversiblePart SKD7466.
Replace it
ReversibleOr have a technician do it.
Follow the reset procedure
ReversibleIncluded with the part.
Check hot water
ReversibleWorks normally.
Plan the next replacement
ReversibleOn schedule.
Model-specific
What is true of this model and not of its siblings
- Why a neutralizer
- Condensate from a condensing heater is acidic, and the neutralizer raises its pH before it goes down the drain. The material is used up over time.
- Noritz's advice
- Replace the neutralizer and follow the reset procedure included with the new part.
- Not a fault
- The code is a service reminder; the heater still works but should not be left too long.
- Ordering the part
- The neutralizer cartridge is a consumable, and your model number decides which part fits. Order it using the part number from Noritz, keep the old one's packaging for reference and note the date of replacement for your records.
Stop boundary
When this stops being a self-service repair
- !Noritz says to replace the neutralizer, part number SKD7466
- !Follow the reset procedure with the new part
Evidence ledger
Sources behind this answer
Exact questions
Common questions
What does 93, EC93 mean on a Noritz tankless water heater?+
The built-in condensate neutralizer has reached the end of its effective lifespan. Performance may be reduced until it is replaced. It applies to certain condensing models such as the NRC111 and NCC199.
Which models?+
Certain condensing models such as the NRC111 and NCC199.
Which part?+
Part number SKD7466.
Is it urgent?+
Performance may be reduced until replaced.