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http://waterheatertimer.org/How-to-troubleshoot-gas-water-heater.html
®
Flammable Vapor Ignition
Resistant Water Heaters
Gas Water Heaters
SERVICE
MANUAL
Troubleshooting Guide
and Instructions for Service
(To be performed ONLY by
qualified service providers)
FEATURING
For the Bradford White
®
Defender Safety System
Models:
MI30T*F(BN,CX,SX) M430T*F(BN,CX,SX)
MI30S*F(BN, CX,SX) M440T*F(BN, CX,SX)
MI303T*F(BN,CX,SX) M4403S*F(BN,CX,SX)
MI40T*F(BN,CX,SX) M4503*F(BN,CX,SX)
MI403S*F(BN,CX,SX) M460T
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The Bradford White DEFENDER ® Safety System Flammable Vapor Ignition Resistant Water Heaters Table of Contents Page Service Procedure Introduction 3 - - - Trouble shooting Chart 4 - - - Inner Door Gasket Removal, Inspection, Replacement and Installation 7 RG-I Thermocouple/Thermopile Testing and Replacement 10 RG-II Pilot Assembly Inspection Cleaning and Replacement 13 RG-III Piezo Igniter, Electrode Testing and Replacement 14 RG-IV White Rodgers/Robertshaw Gas Valve Testing and Replacement 15 R
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INTRODUCTION ® The Bradford White DEFENDER Safety System ® The Bradford White DEFENDER Safety System was designed to resist the ignition of flammable vapors that can occur outside of the water heater. Use and installation are nearly identical to previous versions of atmospherically fired and vented water heaters. A number of exclusive design features are incorporated in the system that will require additional knowledge on the part of the qualified service provider. The following information wil
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White Rodgers/Robertshaw Gas Valve Troubleshooting Chart Flammable Vapor Ignition Resistant Water Heaters SERVICE SYMPTOM PROBABLE CAUSE CORRECTIVE ACTION PROCEDURE 1. Turn on gas supply and/or check line 1. See Service Procedure 1. No incoming gas or too low gas pressure. RG-V, Page 12. pressure. 2. Review lighting instruction. Set 2. Gas control knob set to wrong position. combination/thermostat 4. See Service Procedure 3. Pilot light button not being fully gas valve to correct position. RG-I
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Honeywell Gas Control Troubleshooting Chart Flammable Vapor Ignition Resistant Water Heaters Observe green LED indicator on Gas Control. Error flash codes are displayed with a three second pause before repeating. Check and repair the system as noted in the Green LED Indicator troubleshooting table below. Service LED Status Control Status Probable Cause Procedure 1. Gas Control is functioning If the pilot will not stay Gas Control is operating normally. normally. lit replace pilot None (LED not o
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Honeywell Gas Control Troubleshooting Chart Flammable Vapor Ignition Resistant Water Heaters Observe green LED indicator on Gas Control. Error flash codes are displayed with a three second pause before repeating. Check and repair the system as noted in the Green LED Indicator troubleshooting table below. Service LED Status Control Status Probable Cause Procedure 1. Damage to the temperature Five flashes and sensor. 1. See service Thermostat/well sensor fault. three second 2. Temperature sensor r
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SERVICE PROCEDURE RG-I The Bradford White Inner Door/Gasket Removal, Inspection Replacement and Reinstallation DEFENDER ® For Honeywell Control, rotate Safety System knob counter-clockwise to the “OFF” position. Inner Door Removal Procedure Step 1. Rotate knob of the combination thermostat/gas valve to the “OFF” position. Step 2. Remove outer jacket burner access door For White Rodgers Control, For Robertshaw Control, depress knob slightly and rotate rotate knob clockwise to Step 3. Inner Door R
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SERVICE PROCEDURE RG-I Inner Door/Gasket Removal, Inspection Replacement and Reinstallation GASKET OVERLAP MUST RECOMMENDED PATTERN BE AS SHOWN ENLARGED FOR RTV SEALANT ±1/32" VIEW OF FLANGE AREA PLACE FLANGE SECTIONS FIRST VIEW WITH GASKETS IN PLACE EXPANDED VIEW Installation of Inner Door With Gasket. WARNING Step 7. Clean any residual gasket residue or other debris Stripped fastener connections may allow from combustion chamber surface before for seal breach of inner door. A seal installing t
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SERVICE PROCEDURE RG-I Inner Door/Gasket Removal, Inspection Replacement and Reinstallation Step 10. Firmly place right side inner door flange against the left side inner door flange and secure with (2) hex drive screws from step 3c. DO NOT OVER TIGHTEN SCREWS. Step 11. Align right side inner door to combustion chamber and verify the fastener holes of the combustion chamber are aligned with the right side inner door slotted opening. Verify seal integrity around combustion opening. Secure right s
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SERVICE PROCEDURE RG-II The Bradford White Thermocouple/Thermopile Testing and Replacement DEFENDER ® Safety System CLOSED CIRCUIT THERMOCOUPLE TESTING (White Rodgers Control) Step 1. Closed circuit testing is the preferred method for testing thermocouple. Following the lighting instruction label on the heater, proceed to light the pilot and allow to operate for three minuets. If the pilot will not stay lit, hold the pilot button (located on the combination thermostat/gas valve) down during thi
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SERVICE PROCEDURE RG-II Thermocouple/Thermopile Testing and Replacement OPEN CIRCUIT THERMOCOUPLE TESTING (White Rodgers/Robertshaw Gas Valve) Step 1. Disconnect thermocouple from combination thermostat/gas valve. Step 2. Using a multimeter capable of measuring millivolts, connect one alligator clip to the end ball or contact portion of the thermocouple, and the other alligator clip to copper portion of the thermocouple. Step 3. Following the lighting instruction label on the heater, proceed to
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SERVICE PROCEDURE RG-II Thermocouple/Thermopile Testing and Replacement OPEN CIRCUIT THERMOPILE TESTING (Honeywell Gas Control) The following test should be performed while the pilot flame is on. Step 1. Turn knob to pilot position and depress. Step 2. Continue pressing knob and remove red (+) wire from resettable thermal door switch. Step 3. Using a multimeter capable of measuring millivolts, connect the positive side of the multimeter to the terminal of the resettable thermal door switch. Conn
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SERVICE PROCEDURE RG-III The Bradford White Pilot Assembly Inspection, Cleaning and Replacement DEFENDER ® Safety System For Honeywell Control, rotate PILOT/ELECTRODE ASSEMBLY INSPECTION, knob counter-clockwise to the CLEANING AND REPLACEMENT “OFF” position. Step 1. Turn off gas supply to water heater. Rotate knob For White Rodgers Control, of gas control/gas valve depress knob slightly and rotate to “OFF” position. clockwise to the “OFF” position. Step 2. Remove outer jacket door. For Robertsha
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SERVICE PROCEDURE RG-IV The Bradford White Piezo Igniter, Electrode Testing and Replacement DEFENDER ® Safety System PIEZO IGNITER, ELECTRODE TESTING AND REPLACEMENT With the pilot not in operation (no pilot flame) you can check the Piezo and electrode circuit by viewing pilot thru the sight glass located on the inner door and observing the spark action. Step 1. Remove outer jacket door. Step 2. Repeatedly depress the Piezo igniter while viewing the pilot thru the sight glass. If a spark is pre
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SERVICE PROCEDURE RG-V The Bradford White Gas Valve Testing and Replacement (White Rodgers/Robertshaw) DEFENDER ® Safety System Gas Valve Testing and Replacement (White Rodgers/Robertshaw) The gas valve is a non repairable device. If trouble shooting has determined a problem with the gas valve, it must be replaced. If the burner and/or pilot do not function, service checks for gas pressure, thermocouple output, magnet assembly and ECO are to be performed. If these check OK, the gas valve may be
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SERVICE PROCEDURE RG-V Gas Valve Testing and Replacement (White Rodgers/Robertshaw) THERMOCOUPLE TESTING See SERVICE PROCEDURE RG-II MAGNET ASSEMBLY TESTING (White Rodgers Control) Step 1. Following the lighting instruction label on the heater, proceed to light the pilot and allow to operate for three minuets. If the pilot will not stay lit, hold the pilot button (located on the gas valve) down during this test. Step 2. Using a multimeter capable of measuring millivolts, connect one lead using
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SERVICE PROCEDURE RG-V Gas Valve Testing and Replacement (White Rodgers/Robertshaw) ECO (Energy Cut Off) TESTING Step 1. Disconnect thermocouple from gas valve. Step 2. Using a multimeter capable of measuring Ohms (or continuity), attach one lead (alligator clip) to the pilot tube. Insert the other lead (probe) fully into the magnet opening, Be sure the probe makes contact only at the top center of the magnet opening. Do not allow the probe to make contact with the threaded sides of the opening.
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SERVICE PROCEDURE RG-V Gas Valve Testing and Replacement (White Rodgers/Robertshaw) Step 7. Removal of gas valve. a) Disconnect main burner feedline, pilot tube and thermocouple from gas valve & remove burner from combustion chamber. NOTE: Feed line nut for natural gas control uses right hand threads, LP control uses left hand thread. b) Remove piezo bracket with piezo igniter (refer to SERVICE PROCEDURE RG-IV) from gas valve. c) Remove gas valve from water heater, Wrench Boss rotating counter
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SERVICE PROCEDURE RG-V Gas Valve Testing and Replacement (White Rodgers/Robertshaw) Step 9. Reinstallation of inner door assembly. (cont.) b) Clean any gasket residue or other debris from combustion chamber surface before installing the inner door/gasket assembly. c) Position thermocouple, pilot tube and Piezo wire against left side inner door flange gasket. DO NOT ROUTE THROUGH RADIUSED CHANNEL WITH FEEDLINE. Be sure that thermocouple and pilot tube are not in position to interfere with outer
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SERVICE PROCEDURE RG-VI The Bradford White Gas Control Testing, Disassembly & Replacement (Honeywell) DEFENDER ® Safety System Honeywell Gas Control Testing, Disassembly, and Replacement The Gas Control is made up of (5) major components; the control cover, the piezo igniter, the valve body, the temperature sensor, and the back plate. The Gas Control is designed so that any of these components may be replaced without replacing the entire Gas Control. Valve Body Backplate Gas Control Cover Gas Co
