43 🟡 Repair Required
Noritz Error Code 43: Water Level/Neutralizer Issue
⚠️ Your Noritz water heater has detected a water level or neutralizer issue. It's safe to use, but needs professional attention.
How to Fix Noritz Code 43
- Check if the water level is low. If it is, top it off using the fill valve.
- If the water level is normal, don't attempt to fix the neutralizer or sensor yourself. Call a professional.
- When calling a pro, have the model number ready for a faster diagnosis.
What Does Noritz Error Code 43 Mean?
Error code 43 on your Noritz water heater indicates a problem with the water level or neutralizer. The neutralizer is a component that maintains the water's pH balance, preventing corrosion. If this system isn't working correctly, it could lead to premature equipment failure. The water level sensor ensures your heater has enough water to operate safely and efficiently.
Common Causes of Noritz Code 43
- Low water level in the heater
- Faulty water level sensor
- Neutralizer not functioning properly
- Incorrect water chemistry
Applicable Noritz Models
Need a Pro to Fix Noritz Code 43?
A licensed HVAC technician can diagnose and fix this issue quickly.
Find a Licensed Tech Near You →Replacement Parts for Noritz Tankless Water Heater Code 43
Water Level Sensor OEM: NOR-100012
Neutralizer OEM: NOR-100015