24 🟡 Repair Required
Ruud Error Code 24: Flow Sensor Malfunction
⚠️ Your Ruud unit has detected a problem with its flow sensor, which will prevent it from operating. You will need to call a qualified technician to diagnose and repair the issue.
How to Fix Ruud Code 24
- Step 1: Check the water supply to the unit. Make sure the main water valve is fully open.
- Step 2: Inspect the inlet water filter (if equipped) and clean it if it's clogged. Refer to your owner's manual for location and cleaning instructions.
- Step 3: If the problem persists after checking the water supply and filter, contact a qualified HVAC technician to diagnose and repair the issue.
What Does Ruud Error Code 24 Mean?
The '24' error code on your Ruud unit indicates a problem with the flow sensor. This sensor is responsible for monitoring the flow of water through the heat exchanger. If the control board doesn't see the correct flow, it assumes there's a problem that could damage the unit, so it shuts down operation. This protects the heat exchanger from overheating. Specifically, the control board isn't receiving the expected signal from the flow sensor. This could be due to a faulty sensor, a blockage in the water lines, or even a problem with the wiring or the control board itself. Because the unit is locked out, you won't have hot water until the problem is resolved.
Common Causes of Ruud Code 24
- Faulty flow sensor
- Scale buildup or debris obstructing water flow through the heat exchanger or flow sensor
- Wiring issues (loose connections, damaged wires) between the flow sensor and the control board
- Low water pressure to the unit
- Defective control board
Applicable Ruud Models
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Find a Licensed Tech Near You →Replacement Parts for Ruud HVAC System Code 24
Flow Sensor
Control Board