A.O. Smith
Insufficient Heat Pump Capacity or Control Setting
A.O. Smith hybrid heat pump water heater not producing enough hot water in heat pump mode
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Possible Causes
Ambient air temperature too low for heat pump, Dirty air filter or coil, Heat pump mode only (no electric assist), Incorrect operating mode selected
How to Fix / Troubleshooting
Safety: Turn off power before cleaning internal components.
- 1. Check mode: Ensure the unit is set to Hybrid or High Demand mode, not Heat Pump Only, if you need maximum recovery.
- 2. Ambient temperature: Verify the room temperature meets A.O. Smith's minimum for heat pump operation (often above ~45°F). In cold spaces, switch to Hybrid or Electric mode.
- 3. Clean filter and coil: Remove and clean the air filter. Vacuum dust from the evaporator coil.
- 4. Increase tank setpoint: Within safe limits, raise the temperature setting to increase available hot water.
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Repair Difficulty
Easy
2/5
Required Part
Heat Pump Air Filter
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