A.O. Smith AWH-35 - User Manual

Questions and Answers

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carlcolemanAug 7, 2025
Why is my A.O. Smith AWH-35 Water Heater heat pump not running - high pressure fault?
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  Candace SalinasAug 7, 2025
  If your A.O. Smith Water Heater's heat pump isn't running due to a high pressure fault, first ensure the thermostat setting does not exceed 140°F. If the room temperature is over 95°F, keep the heat pump off until the temperature is within the operating range. Also, check for low water flow; this could be due to the unit pump not operating, excessive piping length between the heat pump and storage tank, scale buildup in the heat exchanger, or partially closed shut-off valves. Possible solutions include replacing the unit pump, reducing piping length or adding a booster pump, cleaning the heat exchanger with a mild acid wash, or fully opening all shut-off valves.
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Billy PhillipsAug 11, 2025
Why is my A.O. Smith AWH-35 water not hot enough?
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  Amy CraneAug 11, 2025
  If your A.O. Smith Water Heater is not providing hot enough water, make sure the thermostat isn't set too low and adjust it to a higher temperature. The heat pump or storage tank might be undersized for your needs, in which case you could increase the size of the storage tank or install a gas or electric heater to compensate. Also, ensure the heat pump is properly connected to the storage tank by referring to the field piping diagrams. Finally, if the unit's cooling coil is overcooling the space, consider using backup water heating, ducting cool air to another space, or ducting warmer air from another space to the installed room.
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vfordAug 16, 2025
Why is my A.O. Smith AWH-35 Water Heater heat pump not running - electrical issues?
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  gloriabrowningAug 16, 2025
  If your A.O. Smith Water Heater's heat pump isn't running and you suspect electrical issues, first check if the circuit has adequate ampacity by referring to the unit's nameplate. Inspect the field wiring for short circuits or loose connections, consulting the field wiring diagram. Also, check the unit's electrical cabinet for short circuits or loose connections, tightening all connections as needed. If the thermostat has failed, replace it. If the Phase Monitor fault light is on, reset the phase monitor.
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Allen RyanAug 20, 2025
Why is my A.O. Smith AWH-35 Water Heater heat pump not running - low pressure fault?
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  Michael LewisAug 20, 2025
  If your A.O. Smith Water Heater heat pump is not running due to a low pressure fault, it could be because the room temperature is below 50°F; in that case, keep the heat pump off until the room temperature is back in operating range. Another cause could be the blower not operating at the specified CFM due to a broken or misaligned blower belt, or dirty filters; correct the airflow issue. Inadequate clearances obstructing airflow around the unit can also cause this issue. Finally, a loss of refrigerant could be the culprit; find the source of the leak, repair it, and recharge the system.
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Gregory MarshAug 25, 2025
How to fix a noisy A.O. Smith AWH-35 heat pump?
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  russellstaffordAug 25, 2025
  If your A.O. Smith Water Heater's heat pump is too noisy, it might be due to a few reasons. Check if the sheet metal fasteners are loose and tighten them. Vibration from the unit could be transferring to the floor or building structure; in this case, place vibration dampeners underneath the unit. Also, inspect the blower pulley assembly for looseness or misalignment, and tighten or align the pulleys as needed.
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Kimberly PetersenAug 28, 2025
What to do if there is water around my A.O. Smith AWH-35 Water Heater heat pump?
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  Carl KingAug 28, 2025
  If you find water on the floor around your A.O. Smith Water Heater's heat pump or water tank, several issues could be the cause. Check for leaks in the tubing, valves, or fittings and repair them as necessary. Ensure the heat pump is level; if not, shim it to level to prevent drain pan overflow. Verify that the condensate trap has been properly installed. If the drain pan is overflowing, use a pipe snake or compressed air to remove any obstructions. Finally, if you're in a humid environment and condensation is forming on the bottom of the unit, cover the bottom with foam insulation.
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Robert GreenSep 2, 2025
Why is the cooling coil icing on my A.O. Smith AWH-35 Water Heater?
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  David NelsonSep 2, 2025
  If your A.O. Smith Water Heater's cooling coil is icing, it could be due to several reasons. Insufficient airflow through the unit could be the cause. Also, low room temperature can lead to icing. Other potential causes include partial refrigerant loss, a defective TX valve, or a clogged filter dryer. For correction suggestions regarding insufficient air flow, refer to the “Heat pump is not running - low pressure fault” section.

A.O. Smith AWH-35 Specifications

General

Model	AWH-35
Heating Element	Copper
Power	3 kW
Frequency	50 Hz
Heater Type	Storage
Type	Electric
Capacity	35 Litres
Pressure Rating	0.8 MPa
Safety Features	Thermal Cut-off, Pressure Relief Valve
Mounting	Wall Mount