A.O. Smith FMD 30, FMD 40, FMD 50, 315795-000 MH instruction manual Troubleshooting Guidelines

Page 26

TROUBLESHOOTING GUIDELINES

These guidelines should be utilized by a qualified service agent.

Problem

 

 

Cause

Solution

 

 

 

 

 

 

 

Improperly sealed, hot or cold supply connection,

Tighten threaded connections.

WATER LEAKS

 

 

relief valve, drain valve, or thermostat threads.

 

 

 

 

Leakage from other appliances or water lines.

Inspect other appliances near water heater.

 

 

 

 

 

 

Condensation of flue products.

Refer to CONDENSATION.

 

 

 

Thermal expansion in closed water system.

Install thermal expansion tank (DO NOT plug T&P valve).

LEAKING T&P VALVE

 

 

Improperly seated valve.

Check relief valve for proper operation

 

 

 

 

(DO NOT plug T&P valve).

HOT WATER ODORS

 

 

High sulfate or mineral content in water supply.

Drain and flush heater thoroughly, then refill.

 

 

 

Bacteria in water supply.

Chlorinate or aerate water supply.

 

 

 

 

 

 

Dirty pilot burner.

Clean pilot assembly.

PILOT OUTAGE

 

 

Thermocouple tip is not in contact with pilot flame.

Insert thermocouple correctly.

 

 

 

Thermocouple malfunction.

Replace thermocouple.

 

 

 

Thermocouple malfunction.

Check thermostat.

 

 

 

Gas knob dial not positioned correctly.

Refer to LIGHTING INSTRUCTIONS.

PILOT WILL NOT LIGHT

 

 

Pilot orifice clogged.

Clean or replace pilot orifice.

 

 

 

Pinched or clogged pilot tube.

Replace pilot tube.

 

 

 

Main gas supply off.

Turn on main gas shut-off valve.

 

 

 

Heater not lit or thermostat not on.

Refer to LIGHTING INSTRUCTIONS.

 

 

 

Thermostat set too low.

Refer to TEMPERATURE REGULATION.

NOT ENOUGH OR

 

 

Heater undersized.

Reduce the hot water use.

NO HOT WATER

 

 

Low gas pressure.

Contact dealer.

 

 

 

Incoming water is unusually cold.

Allow more time for heater to re-heat.

 

 

 

Leaking hot water pipes or fixtures.

Have a plumber check and repair leaks.

 

 

 

High temperature limit switch activated.

Contact a Service Agency to determine cause.

WATER TOO HOT

 

 

Thermostat set too high.

Refer to HIGH TEMPERATURE REGULATION.

WATER HEATER SOUNDS:

 

 

Condensate dripping on burner.

Refer to CONDENSATE.

 

 

Sediment at bottom of heater tank.

Clean sediment from tank. Refer to DRAINING instructions

SIZZLING - RUMBLING

 

 

 

 

 

in Maintenance section of manual.

 

 

 

 

SOOTING

 

 

Improper combustion.

Refer to FACTS TO CONSIDER ABOUT THE LOCATION.

 

 

 

Also see Figure 2 on page 6.

 

 

 

 

 

 

 

 

 

 

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Contents Residential Direct Vent GAS Water Heaters For USE only in Manufactured HomesSafe INSTALLATION, USE and Service Important DefinitionsGeneral Safety Table of Contents IntroductionTypical Installation Thermostat Shield OptionalHotter Water can Scald Locating the NEW Water Heater Facts to Consider about the LocationInsulation Blankets Installing the NEW Water Heater Water Heater InstallationSecuring Water Heater to Floor and Wall Basement or crawl spaceRoof Jack Installation ALL 50 Gallon 189.27 Liter Models ALL ModelsMovement Complete Joint SET HRSWater Piping Valve and Pipe InsulationTEMPERATURE-PRESSURE Relief Valve Filling the Water Heater GAS PipingFor 40 Gallon Heater Sediment TrapsFor 30 Gallon Heater For 50 Gallon HeaterPage For 30 Gallon Heater Page Start UP Conditions Temperature RegulationFor Your Information CondensateOperational Conditions Venting System Inspection Periodic MaintenanceBurner Cleaning Burner InspectionWater system. Check for any leaks Anode ROD InspectionDraining Immediately correct any if foundLeakage Checkpoints Drain Valve Washer ReplacementService Troubleshooting Guidelines Repair Parts List Metal Drain PAN Thermostat Shield Manifold AssemblyPage Page Rechange DE Pièces DES Liste UNE NON ET Rechange DE Pièces DE Liste UNE EST CeciDépannage DE Directives Suie DE FormationVidange DE Soupape LA DE Rondelle LA DE RemplacementFuites DE Vérification DE Points Trop PAS’ANODE Tige LA DE Inspection Brûleur DU Inspection Périodique EntretienEntretien Brûleur DU Nettoyage .37 FigureFonctionnement DE Conditions Démarrage DE Conditions Information Votre PourTempérature LA DE Régulation Condensation’APPAREIL Vers GAZ LE Couper Mort la ou corporelles blessures des matérielsGallons 40 DE EAU-CHAUFFE UN Pour Naturel GAZ AU .L.P Propane GAZ DUGallons 50 DE EAU-CHAUFFE UN Pour EAU-CHAUFFE Gallons 30 Pour30 Figure 19 à 9 étapes lesCe jusqu’à Voir basse, plus la position sa à Droite la vers tournéGallons 30 DE EAU-CHAUFFE UN Pour Modèle DU Signalétique Plaque LA SUR Listé Celui QUESédiments À Trappes EAU-CHAUFFE LE Remplir Remplacement le requiert Ceci .supplémentaire pieds 000 1 mGAZ DE Conduite Et eau,-chauffe le dessert qui gaz en d’alimentationPression DE ET Température DE Décharge DE Soupape Tuyaux DES Isolation ET P & T DE Soupape Prudence’EAU Canalisation DE Réseau Potable non d’eau système un à pas connectez NeRaccords LES ET Cpvc OU ABS PVC, Tuyau LE Cimenter Complet Joint DU Tableau JEU MouvementDE Joints DES Pour Approximatif Prise DE Temps Modèles LES Tous Gallons 50 Litres 189,27 Modèles LES TousCheminée DE Trémie LA DE Installation Pente en toit un sur utilisationMUR AU ET Plancher AU EAU-CHAUFFE LE Fixer EAU-CHAUFFE Nouveau LE Installer EAU-CHAUFFE DU InstallationDétectée est fuite la lorsque Blankets InsulationDe l’air blessures, des éviter Pour » eau-chauffe nouveau le Installer « section la dans EAU-CHAUFFE Nouveau DU L’EMPLACEMENT Choisir’EMPLACEMENT DE Sujet AU Considérer À Faits Respectés être doiventTypique Installation Ébouillanter Peut Chaude Plus L’EAU DEGAZ AU Modèles EAU-CHAUFFE Votre Connaissez ’INSTALLATION Pour Préparer SE Matières DES TableGénérale Sécurité Entretien ET Utilisation .SÉCURITAIRE Installation Importantes DéfinitionsEAU-CHAUFFE CE PAR Utilisé GAZ AU Ajouté EST Odorisant UN 000-15795 Pièce DE .NO Unis-États AUX ImpriméEAU-CHAUFFE LE SUR

FMD 40, FMD 50, 315795-000 MH, FMD 30 specifications

A.O. Smith is a renowned brand in the field of water heating solutions, offering a range of efficient and durable water heaters tailored to meet diverse consumer needs. Among its extensive lineup, the A.O. Smith FMD series showcases several commendable models, including the FMD 30, FMD 40, and FMD 50, each boasting unique features and advanced technologies.

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