Rheem Error Code A043: Water Level Error

Severity: Warning
Type: digital display
Where to look: front panel

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.

What does 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.

Affected Models

Replacement Parts

Part	OEM Number	Est. Cost
Water Level Sensor	RHEEM 360110	—
Water Supply/Drainage Hoses	—	—

Related Codes on Same Models

Code	Description	Severity
A001	Ignition Failure	Warning
A003	Abnormal Ignition	Warning
A004	False Flame Detection	Warning
A008	Exhaust Temperature High	Warning
A011	No Flame Detected	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