A.O. Smith GDHE-50 SERIES

Questions and Answers

D
Daniel RaymondAug 1, 2025
What to do if A.O. Smith GDHE-50 Water Heater has no hot water?
- A
  Amber FarmerAug 1, 2025
  If you're not getting enough hot water from your A.O. Smith Water Heater, start by checking the breaker, fuses, and the water heating Enable/Disable switch to ensure the unit is receiving power. Also, make sure the hot water supply valves to your fixtures are open. If the issue persists, the operating set point might be too low, or the differential setting may be too high, requiring adjustment. Check for any hot water piping leaks, open faucets, or a leaking drain valve. Another reason could be sediment or lime scale accumulation affecting the water heater's operation, in that case, flush the water heater.
R
Richard RowlandAug 8, 2025
Why is A.O. Smith GDHE-50 Water Heater water too hot?
- M
  martinezisaacAug 8, 2025
  If the water from your A.O. Smith Water Heater is too hot, the operating set point might be set too high. In this case, you should lower the operating set point. Also, check the Temperature Probe Offset settings; they might be improperly set.
J
Jeff BaxterAug 16, 2025
How to fix rough starting of A.O. Smith GDHE-50?
- E
  Erika LeblancAug 16, 2025
  For rough starting or operation issues with your A.O. Smith Water Heater, the manual suggests contacting a qualified installer or service agency for installation and service due to potential problems such as an undersized supply gas line, low or excessive gas pressure, incorrect fuel type, vent gas recirculation, excessive piping lengths, clogged intake air screens, or a blocked main burner.
M
Melissa MartinezAug 23, 2025
Why is my A.O. Smith GDHE-50 Water Heater making noise?
- J
  jose55Aug 23, 2025
  Normal operation of A.O. Smith Water Heater may include noises from electrical components such as the combustion blower, transformer hum, and relay contact closure.

Summary

General Safety Information

Precautions and Hazards

Covers general safety, grounding, hydrogen gas, and warnings.

Breathing Hazard - Carbon Monoxide Gas

Details risks of carbon monoxide and installation requirements.

Fire and Explosion Hazards

Warns about flammable vapors, gas leaks, and electrical safety.

Installation and Requirements

Locating the Water Heater

Guides on choosing a safe and efficient location for the unit.

Combustion Air and Ventilation

Explains the necessity of fresh air for proper operation and safety.

Water Piping and Gas Piping

Details requirements for connecting water and gas lines to the heater.

Venting Installation

Provides instructions and considerations for installing vent systems.

Features, Controls, and Operation

Dimensions and Capacity Data

Provides physical dimensions and performance specifications.

Features and Components

Identifies and illustrates key parts of the water heater.

Controls and Switches

Explains the function of various switches and control elements.

Temperature Regulation

Explains temperature settings, scald hazards, and control adjustments.

Control System Operation

Introduces the UIM, navigation, and desktop screen functions.

Maintenance, Troubleshooting, and Warranty

Periodic Maintenance

Covers venting inspection, anode rod, flushing, and leakage checks.

Troubleshooting Common Problems

Lists installation errors, operational issues, and fault conditions.

Wiring Diagram

Illustrates electrical connections for the unit's components.

Limited Residential Gas Warranty

Outlines terms, conditions, and coverage of the product warranty.