John-wood Takagi - 240H-340H-540H User Manual download pdf (Page 46)

46 Page

Troubleshoong

Owner's Guide

Remote

Green

LED

Malfunction

description

Diagnosis

391

TwoTimes Air-fuel ratio rod

failure

• Checkforconnection/breakageofwires(Part#709)

and/orsootontheAFRrod.(Part#108)

441

TwoTimes Flowsensorfailure

(Easy-LinkSystemonly)

• Check for connection/breakage of wires and/or

debrisontheflowsensorimpeller.(Part#402)

510

Six Times Abnormal main gas

solenoid valve

• Check for connection/breakage of wires (Part #708)

and/orburnmarksonthecomputerboard(Part#701).

551

Six Times Abnormal gas

solenoid valve

• Check for connection/breakage of wires (Part #708)

and/orburnmarksonthecomputerboard(Part#701).

611

Four Times Fan motor fault • Checkforconnection/breakageofwires,dustbuildup

inthe fanmotor(Part#103)and/orburnmarkson

thecomputerboard(Part#701).

• Checkforfrozen/corrosionofconnectors(Part#103).

651

Four Times Flowadjustment

valvefault(Easy-

LinkSystemonly)

• Inspect the flow adjustment valve (Part #402), for

connection/breakage of wires, locked motor drive

duetoscalebuildup,and/orwaterleakage.

661

Four Times Bypassvalvefault

(T-H3-DV/540H

only)

• Inspectthebypassvalve(Part#403),forconnection/

breakage of wires, locked motor drive due toscale

buildup,and/orwaterleakage.

701

One Time Computer board

fault

• Checkforconnection/breakageofwires(Part#714).

711

One Time Gas solenoid valve

drive circuit failure

• Referto111and121errorcode.

721

Six Times False flame

detection

• For indoor models, check if condensate drain is

installedontheventcollarofthewaterheater.

• Checkifthereisleakingfromheatexchanger(Part#401).

741

N/A Miscommunication

betweenwater

heater and remote

controller

• Check the model type of the remote controller.

• Inspect the connections between the water heater

and remote controller.

• Checkthepowersupplyofthewaterheater.

751

N/A Miscommunication

betweenwater

heater and

temperature

controller

• Inspect the connections between the water heater

and temperature controller.

• Checkthepowersupplyofthewaterheater.

761

N/A Miscommunication

in Easy-Link system

• Check if the connections between the parent unit

andthechildunitsarecorrect.Refertop.26-29.

941

Five Times Abnormal exhaust

temperature

• Check if the set temperature is higher than 60 °C

(140°F)andthesystemisRecirculation.

991

Five Times Imperfect

combustion

• Checkthegastypeofthewaterheater.

• Inspect the environment around the water heater.

Determinehowlongtheunithasbeeninstalled.

• Check the altitude/elevation of the area of where

thewaterheaterisinstalled.

• Check if there is any blockage in the intake air and/

or exhaust.

• Ifthewaterheaterisinstalledasadirect-ventsystem,

checkwhetherthereisenoughdistancebetweenthe

intake air terminal and the exhaust terminal.

• Checkifthereisgreaseand/ordirtintheburner(Part

#101)andthefanmotor(Part#103),especiallyifthe

water heater has been installed in a contaminated

area.

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John-wood Takagi - 240H-340H-540H User Manual Page 46

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