Rheem Error Code A043: Water Level Error
Warning: Your Rheem HVAC system has detected a water level issue, which could lead to system damage if not addressed.
How to Fix Rheem Code A043
- Step 1: Turn off your HVAC system at the thermostat and the main power switch.
- Step 2: Check for any visible leaks around your HVAC unit. If you find a leak, turn off the water supply and call a professional immediately.
- Step 3: If there are no visible leaks, the problem might be with the water level sensor. You can try resetting your HVAC system by turning off the power, waiting for 30 seconds, and then turning it back on. If the problem persists, call a professional.
How to Reset Rheem Code A043
- Turn off the unit using the power button on the front panel.
- Turn off the gas supply valve.
- Turn off the circuit breaker supplying power to the unit. Wait 30 seconds.
- Restore power at the breaker, then open the gas valve.
- Turn the unit back on. If the error returns, the underlying issue needs repair.
Resetting clears the code from the display but does not fix the underlying fault. If the code returns after reset, proceed to the diagnostic steps above.
What Does Rheem Error Code A043 Mean?
The A043 error code on your Rheem HVAC system indicates that the water level in the system is either too high or too low. This could be due to a faulty water level sensor, a leak in the system, or a problem with the water supply or drainage. It's important to address this issue promptly to prevent further damage to your system.
Common Causes
- Faulty water level sensor
- Leak in the system
- Problem with water supply or drainage
- Air in the system
Diagnostic Steps
| If... | Check | Expected |
|---|---|---|
| Water level sensor is reading abnormally high or low | Inspect the water level sensor for any signs of damage or corrosion | No damage or corrosion |
| Water supply or drainage lines are clogged or kinked | Check the water supply and drainage lines for any blockages or kinks | Clear and straight lines |
Applicable Rheem Models
- NCB(gas)
- NPE(electric)
- R801T(gas)
- R92E(electric)
- R92V(gas)
- RGE(gas)
- RH2T(electric)
- RNC(dual_fuel)
- RNE(electric)
- RNG(gas)
- RP16(electric)
- RPB(gas)
- RTGH(gas)
- Rheem Classic(gas)
- Rheem Classic 80 Plus(gas)
- Rheem Classic 80% Gas Furnace(gas)
- Rheem Classic 90 Plus(gas)
- Rheem Classic Plus Series(gas)
- Rheem Classic Series(dual_fuel)
- Rheem Prestige(gas)
- Rheem Prestige 95% Gas Furnace(gas)
- Rheem Prestige Series(gas)
Replacement Parts
| Part | OEM Number | Est. Cost | Where to Buy |
|---|---|---|---|
| Water Level Sensor | RHEEM 360110 | — | Find Part |
| Water Supply/Drainage Hoses | — | — | — |
Related Codes on Same Models
Other codes that affect the same Rheem model families as A043.
| Code | Description | Severity |
|---|---|---|
| A001 | Ignition Failure | Warning |
| A021 | Over-Temperature | Warning |
| A031 | Inlet Thermistor Open/Short | Warning |
| A041 | Outlet Thermistor Open/Short | Warning |
| A051 | Fan Motor Abnormality | Warning |
| A052 | Fan Motor Speed Error | Warning |
| A053 | Fan Motor Open Circuit | Warning |
| A054 | Fan Motor Overcurrent | Warning |
| A055 | Fan Motor Locked | Warning |
| A095 | DIP Switch Error | Warning |