User Manual for The Home Depot Tankless Water Heater FS10B1S

Comprehensive user guide for The Home Depot FS10B1S tankless water heater. Includes operation instructions, wired controller setup, maintenance, antifreeze procedures, and troubleshooting.

Quick answers from the manual

Quick answer

To start the FS10B1S water heater, ensure the power switch is on, press the power button on the wired controller, and open both the water inlet and gas valves. Hot water will flow when the hot water tap is opened. p. 1

Key actions

Drain the unit for winter storage p. 6
Check pressure relief valve p. 4

First start

Initial setup steps p. 1

Problems and fixes

System fault

The buzzer will sound continuously for 10 times, and the display will show an error code.

p. 2

Maintenance and reset

Routine maintenance p. 3

Technical specifications

Parameter	Value	Meaning	Pages
Temperature Range	95°F - 123°F	Outlet water temperature range.	p. 2

Where to find it in the PDF

Operation p. 1, 2
Maintenance p. 3, 4, 5, 6

Table of contents

Quick Guide

This manual provides instructions for the operation and maintenance of the FS10B1S tankless water heater. Before initial use, ensure the unit is installed correctly, connections are leak-free, and the power switch is turned on. The device is designed for water temperatures between 95°F and 123°F (35°C - 51°C).

Operation Instructions

To start the device:

Confirm the power switch is on and close the door latch.
Press the power key on the wired controller.
Turn on the water inlet valve and gas valve.
Turn on the water outlet valve (hot water tap) to initiate flow.

Temperature Control: Use the up and down arrow keys on the controller to adjust the temperature. The unit will display the current water temperature. Press the F/C Priority button to toggle between Fahrenheit and Celsius.

Maintenance

Regular maintenance is essential for safety and performance. Disconnect power and allow the unit to cool before performing any maintenance.

Routine Inspection: Monthly checks for dust in air intake/exhaust, unusual appearance, abnormal noise, and water/gas leaks.
Flame Check: The flame should appear blue through the observation window. If abnormal, contact service.
Cleaning: Clean the outer shell with a damp cloth (no chemical solvents). Clean the air intake grille and dust filter regularly.

Pressure Relief Valve

The pressure relief valve must be checked at least annually. Turn off the water inlet and gas supply, then gently open the relief valve handle to ensure water flows out. If no water flows, the valve is invalid and requires service.

Antifreeze and Drainage

If the unit is stored in freezing conditions, it must be drained to prevent damage.

Close the cold water inlet valve.
Open the hot water faucet or shower to release pressure.
Remove the drain screw to allow water to drain completely.
Securely replace the drain screw before next use.

The unit also features an automatic antifreeze function. When water temperature is low (approx. 43°F), the system may initiate ignition or heating cycles to protect the unit, provided electricity and gas are connected.

Technical Settings

The unit allows for setting a minimum heat load for testing purposes. This involves specific button sequences on the controller (e.g., accessing program codes like 'PP' and 'PH'). Refer to the full manual section 5.6 for detailed programming steps.

Manufacturer information

The Home Depot

Brand profile

Manufacturer website https://www.homedepot.com Support https://www.homedepot.com/c/Customer_Support

Practical help

Common problems

Water not heating

Check if gas supply is on, power is connected, and water inlet/outlet valves are open.

Error codes on display

The display will show an error code if a fault occurs. Refer to the troubleshooting section or contact service.

Freezing risk

Drain the unit completely if storing in freezing temperatures or if the unit will not be used for a long time.

Before use

Ensure the unit is installed correctly and connections are leak-free.
Verify the power switch is turned on.
Ensure the gas supply valve is open.
Ensure the water inlet and outlet valves are open.
Check that the wired controller is properly mounted and connected.

Specs in practice

Temperature Range: 95°F - 123°F (35°C - 51°C) for outlet water.
Pressure Relief Valve: Recommended setting is 150 PSI / 210°F.
High Altitude: Input rate decreases by 4% for every 1000ft increase in altitude above 5000ft.

Model compatibility

For Canada: 0-4500 ft above sea level.
For US: 0-5000 ft above sea level.
Above 5000 ft: Must comply with CSA B149.1 and ANSI Z223.1/NFPA54.

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Manual page author

David Miller

Documentation analyst

Organizes user manual content into clear summaries, with attention to model details, product context, and everyday usability.