43 🟡 Repair Required
Rinnai Error Code 43: Water Level Circuit Error
⚠️ Your Rinnai water heater has detected a water level issue. It's safe to use other appliances, but call a professional for repair.
How to Fix Rinnai Code 43
- Check the water supply to ensure it's turned on and there are no kinks in the hose
- Listen for any unusual noises coming from the water heater, which could indicate a leak
- If you suspect a leak, turn off the water supply and call a professional immediately
What Does Rinnai Error Code 43 Mean?
Error code 43 on your Rinnai water heater indicates a problem with the water level circuit. This circuit ensures your water heater has enough water to operate safely and efficiently. The most common causes for this error are a faulty water level switch or a low water level in the tank.
Common Causes of Rinnai Code 43
- Faulty water level switch
- Low water level in the tank
- Air in the lines causing a false low water level reading
- Faulty temperature and pressure relief valve (T&P valve) causing water to leak
Applicable Rinnai Models
Need a Pro to Fix Rinnai Code 43?
A licensed HVAC technician can diagnose and fix this issue quickly.
Find a Licensed Tech Near You →Replacement Parts for Rinnai Tankless Water Heater Code 43
Water Level Switch OEM: RIN-1120000000
Temperature and Pressure Relief Valve (T&P Valve) OEM: RIN-1120000001