GSW ANSI Z21.10.1 - CSA 4.1 User Manual (English)

Questions and Answers:

L
lanceklineAug 20, 2025
What to do if the pilot light won't light or stay lit on my GSW ANSI Z21.10.1 - CSA 4.1?
- K
  Kim CollinsAug 20, 2025
  If the pilot light on your GSW Water Heater won't light or stay lit, here are some things to check: * Air in the gas line: Bleed the air from the line. * No gas: Check with your gas utility company. * Dirt in gas lines: Notify the utility to install a sediment trap. * Clogged pilot line or orifice: Clean it and locate the source. * Defective thermopile: Replace it. * Insufficient combustion air: Ensure the vent is unblocked. * Open ECO switch: Replace the gas control/thermostat. * Defective igniter or electrode: Replace the igniter or pilot assembly. * Low gas pressure: Check with the gas utility company. * Incorrect gas: Verify the rating plate and check with the gas company.
D
Dr. Mary Lee DVMAug 25, 2025
Why won't the burner ignite on my GSW Water Heater?
- M
  Madison JacksonAug 25, 2025
  If the burner on your GSW Water Heater won't ignite, consider these potential causes and solutions: * Pilot not lit: Light the pilot. * Thermostat set too low: Adjust the temperature dial. * No gas: Check with your gas utility company. * Dirt in gas lines: Notify the utility company to install a trap. * Clogged pilot line: Clean the line and locate the source of the clog. * Clogged main burner line: Clean the line and locate the source of the clog. * Defective thermopile: Replace the thermopile. * Defective gas control/thermostat: Replace the gas control/thermostat.
K
karen39Aug 26, 2025
How to reduce high operation costs of GSW Water Heater?
- D
  Denise CampbellAug 27, 2025
  High operation costs for your GSW Water Heater can stem from several factors: * Thermostat set too high: Lower the temperature. * Sediment or lime in the tank: Drain and flush the tank; consider water treatment. * Undersized water heater: Install a larger heater. * Incorrect piping: Ensure the dip tube is in the cold inlet. * Leaking faucets: Repair them. * Gas leaks: Contact your gas company and repair immediately. * Wasted hot water: Reduce usage. * Exposed piping: Insulate the pipes. * Piping in exposed walls: Insulate these pipes.
S
Scott ChavezAug 28, 2025
Why is the hot water recovery so slow on my GSW Water Heater?
- S
  Sergio CrawfordAug 28, 2025
  Slow hot water recovery in your GSW Water Heater may be due to: * Insufficient combustion air: Check the vent and burner. * Clogged venting/flue: Clean the flue and find the source of the blockage. * Low gas pressure: Check with the gas utility. * Improper calibration: Replace the gas control/thermostat. * Thermostat set too low: Adjust the temperature. * Undersized water heater: Install a larger one. * Incorrect piping: Correct the piping, ensuring the dip tube is in the cold inlet. * Wasted hot water: Reduce hot water usage. * Sediment or lime in the tank: Drain and flush the tank, and consider water treatment.
J
Jerry HoweAug 30, 2025
Why is the burner flame yellow and lazy in my GSW Water Heater?
- L
  luishoganAug 30, 2025
  A yellow or lazy burner flame in your GSW Water Heater could indicate: * Low gas pressure: Check with your gas utility company. * Clogged flue: Clean the flue and locate the source of the blockage. * Clogged main burner line: Clean the line and locate the source. * Obstruction in the main burner orifice: Clean or replace the orifice. * Insufficient combustion air: Make sure the vent is not blocked.
T
Tracy LoweryAug 31, 2025
Why is my GSW Water Heater emitting combustion odors?
- E
  Emily FlemingAug 31, 2025
  If you're experiencing combustion odors from your GSW Water Heater, the issue could be: * Insufficient ventilation air: Provide ventilation to the water heater and check the burner. * Clogged flue or blocked vent system: Clean the flue and locate the source of the blockage. * Heater installed in a confined area: Provide fresh air ventilation.
A
angela08Sep 2, 2025
How to fix smelly water from GSW Water Heater?
- J
  Joshua AdamsSep 3, 2025
  If your GSW Water Heater is producing smelly water, it might be due to sulfur in the water. You can try replacing the anode with a special anode. Also, raising the water heater temperature setting to 60°C (140°F) may help to eliminate the odour, but this will require the use of a mixing valve.
P
Peter RyanSep 4, 2025
What causes smoking and carbon formation in GSW Water Heater?
- S
  Shawn RaymondSep 4, 2025
  Smoking and carbon formation in your GSW Water Heater may be caused by: * Insufficient combustion air: Check the vent and burner. * Low gas pressure: Check with your gas utility company. * Clogged venting/flue: Clean the flue and locate the source. * Defective gas control/thermostat: Replace it. * Burner flame yellow-lazy: Refer to the 'Burner Flame Yellow-Lazy' troubleshooting section.
R
rwestSep 6, 2025
Why is my GSW Water Heater relief valve dripping?
- T
  tbautistaSep 6, 2025
  A drip from the relief valve on your GSW Water Heater can be due to: * Excessive water pressure: Use a pressure reducing valve and relief valve. * Heater stacking: Lower the thermostat setting. * Closed water system/thermal expansion: See “Closed System/Thermal Expansion”.
T
Terri MooreSep 8, 2025
What causes condensation on my GSW Water Heater?
- A
  aaronsilvaSep 8, 2025
  Condensation on your GSW Water Heater can occur if: * The temperature setting is too low: Increase the temperature. * The water heater is too small: Install an adequate size heater.

GSW ANSI Z21.10.1 - CSA 4.1 Specifications

General

Brand	GSW
Model	ANSI Z21.10.1 - CSA 4.1
Category	Water Heater
Language	English

Summary

TYPICAL INSTALLATION

LOCATING THE NEW WATER HEATER

FACTS TO CONSIDER ABOUT THE LOCATION

AIR REQUIREMENTS

STORAGE OF FLAMMABLE LIQUIDS

Clearances To Combustibles

CHEMICAL VAPOUR CORROSION

WATER PIPING

Mixing Valves

INSTALLING THE NEW WATER HEATER

WATER PIPING INSTALLATION

Step-by-step instructions for installing water piping and fittings.

TEMPERATURE-PRESSURE RELIEF VALVE

Details on the T&P valve, its requirements, installation, and discharge piping.

T&P Valve Discharge Pipe Requirements

FILLING THE WATER HEATER

Step-by-step procedure for filling the water heater tank before operation.

COMBO HEATING

System Requirements

Installation

Installation guidelines for combo heating systems, covering options A and B.

GAS PIPING

Gas Supply and Piping Requirements

SEDIMENT TRAP

HIGH ALTITUDE INSTALLATIONS

VENTING

VENT TERMINAL CLEARANCES

Required clearances for the vent terminal from various building features and openings.

VENT ASSEMBLY

Instructions for assembling and connecting the vent piping and termination hood.

VENT CONNECTION TO THE WATER HEATER

Detailed instructions for connecting the vent pipes to the water heater's flue connection.

Low Vent installation

VENT CONNECTIONS

Instructions for connecting the vent piping to the water heater and vent terminal.

SECURING VENT TERMINATION ASSEMBLY TO THE EXTERIOR WALL

OFFSET VENT ARRANGEMENT

High Vent installation

LOCATING CLEARANCE HOLE FOR VENT

Steps for cutting the clearance hole in the exterior wall for the vent assembly.

VENT RESTRICTER PLATE

Minimum Vent installation

STANDARD VENT ARRANGEMENT

INSTALLATION CHECKLIST

Water Heater Location

Gas Supply and Piping

Vent Pipe System

Vent Termination Hood

Water System Piping

LIGHTING INSTRUCTIONS

WHAT TO DO IF YOU SMELL GAS

TEMPERATURE REGULATION

Temperature Adjustment

How to adjust the thermostat for desired water temperature and energy saving.

OPERATING THE TEMPERATURE CONTROL SYSTEM

Explanation of the temperature control system and its modes.

MAINTENANCE

BURNER FLAMES

REMOVING THE BURNER FROM THE MANIFOLD/BURNER ASSEMBLY

Procedure for removing the burner from the manifold/burner assembly.

REPLACING THE MANIFOLD/BURNER ASSEMBLY

Procedure for replacing the manifold/burner assembly.

To Refill The Water Heater Storage Tank

Steps to refill the water heater tank after draining.

To Remove The Anode Rod:

SERVICING THE WATER HEATER

General guidelines for servicing the water heater.

REPLACING THE PILOT/THERMOPILE ASSEMBLY

Steps for replacing the pilot/thermopile assembly.

TESTING THE IGNITER SYSTEM

To Flush The Water Heater Storage Tank

Procedure for flushing the water heater storage tank to remove sediment.

To Install The Anode Rod:

VENTING SYSTEM INSPECTION

REMOVING AND REPLACING THE GAS CONTROL VALVE/THERMOSTAT

Step-by-step procedures for removing and replacing the gas control valve/thermostat.

TEMPERATURE-PRESSURE RELIEF VALVE TEST

Procedure for testing the T&P valve operation annually.

PILOT AND MAIN BURNER

Annual inspection of the pilot and main burner for proper flame characteristics.

DRAINING, REFILLING AND FLUSHING

Instructions for draining, refilling, and flushing the water heater tank.

ANODE ROD MAINTENANCE

Importance of anode rod maintenance for tank life and troubleshooting smelly water.

SERVICE

LEAKAGE CHECKPOINTS

Guide to identify and correct sources of water leakage around the water heater.

TROUBLESHOOTING GUIDELINES

BURNER WILL NOT IGNITE

Possible causes and corrections for a burner that fails to ignite.

INSUFFICIENT HOT WATER

Troubleshooting for insufficient hot water, including tank size and piping issues.

STATUS LIGHT AND DIAGNOSTIC CODE TROUBLESHOOTING CHART

Chart for diagnosing problems using status light codes and their corrective actions.

4 FLASHES

Troubleshooting for 4 flashes, indicating high water temperature shutdown.

SMELLY WATER

SLOW HOT WATER RECOVERY

0 FLASHES (LED NOT LIT)

Troubleshooting for no status light, indicating pilot or thermopile issues.

5 FLASHES

Troubleshooting for 5 flashes, indicating a defective temperature sensor.

BURNER FLAME YELLOW-LAZY

DRIP FROM RELIEF VALVE

RED LIGHT ON (SOLID)

Troubleshooting for a solid red light, indicating recent pilot extinguishment and thermopile cooling.

7 FLASHES

Troubleshooting for 7 flashes, indicating gas control valve failure.

PILOT WILL NOT LIGHT OR REMAIN LIT

Causes and corrections for pilot light issues, including gas supply and thermopile checks.

THERMOSTAT FAILS TO SHUT OFF

Troubleshooting for a thermostat that fails to shut off the burner.

8 FLASHES

Troubleshooting for 8 flashes, indicating issues with the gas control valve/thermostat or pilot operation.

HIGH OPERATION COSTS

COMBUSTION ODOURS

2 FLASHES

PILOT FLAME TOO SMALL

SMOKING AND CARBON FORMATION (SOOTING)

BURNER FLAME FLOATS AND LIFTS OFF PORTS

BURNER FLAME TOO HIGH

FLAME BURNS AT ORIFICE

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