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John Wood electric water heater from GSW at InspectApedia.comJohn Wood JW Water Heater
Age, Error Codes, Manuals

Here are John Wood water heater manuals, contact information for the John Wood water heater company, and a John Wood brand Water Heater Data Decoding Document that Aids in Determining Water Heater Age.

Our photo at page top shows a GSW / John Wood / SpaceSaver / GSW-MOffat electric water heater from the company's 2011 manual.

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John Wood Water Heaters Age & Manuals JW Water Heaters

JW water heaters or John Wood water heaters are distributed by the GSW Water Heating Company in Ontario. These water heaters are sold under the brands: GSW, John Wood, SpaceSaver, and GSW Moffat.

Question: decode the age of a John Wood boiler or water heater from serial number

2018/05/29 Kenneth E. Hohman said:

How can I determine age of my water heater ? John Wood 50 gal. Model JW650TNA Serial no. S0204 779331

Reply:

Kenneth,

Your John Woods water heater S0204 779331 is probably one made in 1993, week 31

Thanks to Carson Dunlop Associates Technical Reference Guide (shown in the Citations & References section at the bottom of this page)

the age is of a John Wood water heater is usually encoded in either the first four digits (recent heaters)

on newer equipment

coded as Annn-nnYYWW

coded as YYMM-nnnnnn

or onv older John Wood heaters in the last four digits of the serial number

coded as nnnnnn-YYMM

Examples of John Wood heater age decoding from the serial number

123456-7403 = year 1974 month 03

9001-123456 = 1990 month 01

your John Woods water heater S0204 779331 is probably one made in 1993, week 31

Also see GSW WATER HEATER AGE ENCODING

For parts and support for a John Woods water heater also contact GSW at the contact points we give just below.

Also see GSW WATER HEATER AGE ENCODING https://inspectapedia.com/plumbing/Water-Heater-Age-Manuals.php#GSW
For parts and support for a John Woods water heater also contact

GSW Website: http://www.gsw-wh.com/en/products/electric

GSW Water Heaters
599 Hill Street West
Fergus, Ontario, Canada N1M 2X1

T 1.888.479.8324

or ANTHES in our WATER HEATER AGE DECODING GUIDES - live link found above

John Woods Water Heater Manuals

The company's manuals include this warning:

WARNING: Improper installation, adjustment, alteration, service, or maintenance can cause injury or property damage. Refer to this manual. For assistance or additional information, consult a qualified installer, service agency, or the gas utility.

 

John Wood Water Heater Error Codes

Watch out: your water heater model may use different codes or may provide error codes that are not given here. Therefore you'll want to consult the manual for your specific heater.

Table of John Wood Water Heater Error Codes
Error Code Meaning
031

Wrong dip switch setting, possibly LP gas set when the fuel is Natural gas, or vice versa.

Green LED flashes once.

101

Improper combustion. Watch out: this is an unsafe condition.

Green LED flashes five times

111

Ignition failure;

Green LED flashes three times.

The burners do not light. Check for a bad igniter, flame sensor, gas valve. Check for gas supply. Check for a blown fuse on the circuit board.

121

Burner flame lost. See code 111 above.

Green LED flashes three times.

311 Output thermistor failure. Check the thermistor and its wires on the heat exchanger. Replace the thermistor if you don't see a loose or disconnected wire.
321

Input thermistor failure.

Green LED flashes twice

Check the thermistor and its wires at the water inlet. Replace the thermistor if you don't see a loose or disconnected wire.

331

Output thermistor failure.

LED flashes twice.

341

Exhaust thermistor failure.

LED flashes twice.

391

Air-Fuel-Ratio Rod failure (AFR failure) check for loose wires or replace the AFR

LED flashes twice.

441

Flow sensor problem

Led flashes twice

Possibly Inlet filter clogged, water flow problem. Also check for loose wire connections.

510

Gas valve / gas solenoid valve failure. Inadequate gas pressure or flow. Also check circuit board wiring & damage. Bad circuit board may fail to open valve.

LED flashes six times
551

Gas solenoid valve failure. Check gas supply and if no problem the solenoid needs replacement. See code 510.

LED flashes six times
611

Water heater fan motor failure. Check for loose wires and if none found the fan needs replacement. Also check ciruit board wiring & board for damage.

LED flashes 4 times
651

Flow sensor warning. Check wiring, check for scale build up; heater may need de-scaling procedure.

LED flashes four times.

661

Bypass valve failure - only on John Wood water heater model 540H. Check wiring, scale clogging. May need cleaning.

LED flashes four times.

701

Computer board failure; check for loose wires, electrical power supply, signs of damage to the board such as black or brown marks indicating overheating or burned

LED flashes once.

711

Gas solenoid valve drive circuit failure. See Codes 111 & 121

LED flashes once.

721

False flame detected. Blinks 6 times. Check for condensate accumulation, blocked or missing condensate drain, condensate leaks.

LED flashes 6 times.

741 Remote control not communicating with the water heater, check remote batteries, check remote sensor wiring, remote control access line of sight.
751 Remote control not communicating with the water heater, check remote batteries, line of sight. See code 741.
761 Easy Link system communication failure. Check connection between multiple water heaters.
941

Exhaust temperture high. Water temperature may be above 140°F.

LED flashes 5 times.

991

Improper gas combustion.

LED flashes 5 times.

Watch out: this is an unsafe condition risking CO hazards.
If this indicator is on from first activation of the heater it may not be properly adjusted for the elevation at which the heater is installed.

Check for blocked exhaust flue or under-sized exhaust flue.

Check for debris clogging the gas burner or for a failed or blocked fan.

How to use this John Wood water heater error code table

Watch out: some water heater defects represent dangerous conditions, risking fire, explosion, or carbon monoxide poisoning or scalding hazards. Work on these heaters must be by a qualifed service professional.

See the water heater manual or troubleshooting manual for your specific water heater model for expanded detail about the meaning and the corrective steps for each of these error codes.

Also see AO SMITH WATER HEATER AGE & MANUALS

Also see TAKAGI WATER HEATER MANUALS, AGE, ERROR CODES - Takagi water heaters are distributed in North America by A.O. Smith.

 

 

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Reader Comments, Questions & Answers About The Article Above

Below you will find questions and answers previously posted on this page at its page bottom reader comment box.

Reader Q&A - also see RECOMMENDED ARTICLES & FAQs

On 2020-05-25 - by (mod) -

Thanks for asking, Michelle:

The age is of a John Wood water heater is usually encoded in either the first four digits (recent heaters) or the last four digits (older John Wood heaters) of the serial number.

From your John Wood water heatre's serial number

Serial # 9209417624

my guess would be YYMM417624 or 92 09 or 1992, September based on the first four digits in the serial number

What we have on John Wood water heaters is above on this page starting at

JOHN-WOOD WATER HEATER AGE & MANUALS

https://inspectapedia.com/plumbing/John-Wood-Water-Heater-Age-Manuals.php

On 2020-05-25 by Michelle

I an enquiring how old this John Wood Hot water tank is - Serial # 9209417624 Model #-JW525DET-Thank you

This Q&A were posted originally at AGE of HEATERS, BOILERS, FURNACES

On 2019-12-02 - by (mod) -

Ali

Thank you so much for helping out on this page.

If you are someone involved in the business and want to be identified, use the page top or bottom contact link to send me that information.

On 2019-12-01 by Ali

@Valerie Beaton,

Your John Wood heater is 2007 ("07") which makes it a mere 12 years old which isn't bad since the new ones seem to die out about that time.

On 2019-03-13 by Valerie Beaton

Would you please tell me the year of my hot water tank. Thank You

SN U0710529167

Model # JW50SDE130

On 2019-12-01 by Ali

@orien major,

Close. Using the four numbers after the letter, then the year of yours is 2003 ("03") not paying heed to the insignificant month 04 followed after... therefore yours is 16 years old here in 2019.

Your heater is quite young compared to my John Wood that was made in 1993 (yes, that's right, 26 years old!), but I'd replace the sacrificial/anode rod, check your pressure relief valve and drain the tank of sediment.

I'm willing to bet your water intake plastic tube is broken off as well. I did the apparent first ever service last month here in 2019 and had to replace the aforementioned parts along with a new drain valve and water shut off valve... small price to pay for keeping my heater running for more good years. I'll only replace it if it springs a leak. ;-

On 2019-01-18 by orien major

Serial number on my heater is S0304-520008. Does this mean that my heater is 18 years old?

On 2016-10-04 by (mod) - John Wood water heater age

See the data at JOHN-WOOD WATER HEATER AGE & MANUALS

On 2016-10-04 by Stan - John Wood water heater age

Age of water heater?
My heater is a John Wood.

The John Wood water heater serial# is 1946A010890.

I know the tank is less than 15 years old but exactly how old?


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